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The O-Ta (Oxygen-Tantalum) system

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Journal of Phase Equilibria

An Erratum to this article was published on 01 August 1997

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Cited References

  1. K.K. Kelly, “The Specific Heats at Low Temperatures of Tantalum Oxide and Tantalum Carbide,”J. Am. Chem. Soc, 62, 818–819 (1940). (Thermo; Experimental)

    Article  Google Scholar 

  2. S. Lagergran and A. Magneli, “On the Ta-O System,”Acta Chem. Scand., 6, 444–446 ( 1952). (Equi Diagram, Crys Structure; Experimental)

    Article  Google Scholar 

  3. R.L. Orr, “High Temperature Heat Contents of Tantalum and Niobium Oxides,”J. Am. Chem. Soc, 75, 2808 (1953). (Thermo; Experimental)

    Article  Google Scholar 

  4. G.L. Humphrey, “Heat of Formation of Tantalum, Niobium and Zirconium Oxides, and Tantalum Carbide,”J. Am. Chem., Soc, 76, 978–980 (1954). (Thermo; Experimental)

    Article  Google Scholar 

  5. A.V. Lapitskii, Yu.P. Simanov, K.N. Semenenko, and E.I. Yarembash, “On Some Properties of Tantalum Pentoxide,”Vestn. Most Univ., Ser. Fiz.-Mat. Estestv. Nauk, 9(3), 85–89 (1954). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  6. N. Schönberg, “An X-Ray Investigation of the Ta-O System,”Acta Chem. Scand., 8(2), 240–245 (1954) (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  7. Yu.P. Simanov, A.V. Lapitskii, and E.P. Artamonova, “On Some Properties of Tantalum Pentoxide,”Vestn. Mosk. Univ., Ser. Fiz.-Mat. Estestv. Nauk, 9(9), 109–113 (1954) in Russian. ((Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  8. L.K. Frevel and H.N. Rinn, “Powder Diffraction Standards for Nb2O5 & Ta2O5,”Anal. Chem., 27(8), 1329–1330 (1955). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  9. E. Gebhardt and H. Preisendanz, “On the Solubility of Oxygen in Ta and the Allied Property Changes,”Z Metallkd., 46, 560–568 (1955) in German. (Thermo; Experimental)

    Google Scholar 

  10. A.I. Zaslavskii, R. A. Zvinchuk, and A.G. Tutov, “X-Ray Investigation on Polymorphism of Ta2O5,”Dokl. Akad. Nauk SSSR, 104, 409 (1955) in Russian. (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  11. A. Reisman, F. Holtzberg, M. Berkenbht, and M.J. Berry, “Reactions of the Gr. VB Pentoxides with Alkali Oxides and Carbonates. III. Thermal & X-Ray Phase Diagrams of the System K2O or K2CO3 with Ta2O5,”J. Am. Chem. Soc, 78, 4514 (1956). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  12. E. Gebhardt and H. Seghezzi, “Solubility and Oxidation in System Ta-O,”Z. Metallkd., 48, 503 (1957) in German. (Equi Diagram, Meta Phases, Thermo; Experimental)

    Google Scholar 

  13. M.G. Inghram, W.A. Chupka, and J. Berkowitz, “Thermodynamics of the Ta-O System: The Dissociation Energies of TaO and TaO2,”J. Chem. Phys., 27, 569 (1957). (Thermo; Experimental)

    Article  ADS  Google Scholar 

  14. W.J. Kramers and J.R. Smith, “Some Properties of Refractory Non-stoichiometric Oxides,”Trans. Br. Ceram. Soc, 56, 590–607 (1957). (Crys Structure; Experimental)

    Google Scholar 

  15. A.V. Lapitskii, Yu.P. Simansov, and E.P. Artmonova,Zh. Neorg. Khim., 2, 80–91 (1957) in Russian; quoted from [66Nie]. (Equi Diagram, Meta Phases; Experimental)

    Google Scholar 

  16. G.V. Samsonov, “Intermediate Stages in Carbide Formation Reactions of Ti, Zr, V, Nb and Ta,”Obshch, Neorg. Fizi. Khim., 287–296 (1957) in Russian. (Equi Diagram, Meta Phases, Thermo; Experimental)

  17. G. Brauer and H. Müller,Mineral Chem. (Prvc. IUPAC’s 16th Congress), Butterworths Sci. Publ., London, 63 (1958); quoted from [62Norl]. (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  18. E. Gebhardt and H.D. Seghezzi, “Investigation in System Ta-O. II. Reaction and Equilibrium between Mixed Crystal and Oxide Phases,”Z Metallkd., 50, 521–527 (1959) in German. (Equi Diagram, Meta Phases ; Experimental)

    Google Scholar 

  19. G.L. Miller,Ta and Nb, Academic Press, NY, 602 (1959). (Equi Diagram, Meta Phases; Experimental)

    Google Scholar 

  20. J. Harvey and H. Wilman, “The Crystallization of Thin Amorphous Tantalum Oxide Films Heated in Air or Vacuo, and the Structure of the Crystalline Oxide,”Acta Crystallogr., 14, 1278–1281 (1961). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  21. P. Kofstad, “Oxidation of Ta in the Temperature Range 500–700 °C,”J. Inst. Met., 90, 253–264 (1961–62). (Equi Diagram, Meta Phases; Experimental)

    Google Scholar 

  22. J.R Pemsler, “Thermodynamics of the Interaction of Nb and Ta with O and N at Temperatures near the Melting Point,”J. Electmchem. Soc, 108(8), 744–750 (1961). (Thermo; Experimental)

    Article  Google Scholar 

  23. D. A. Vaughan, O.M. Stewart, and C.M. Schwartz, “Determination of Interstitial Solid Solubility Limit in Ta Identification of Precipitated Phase,”Trans. AIME, 221, 937–946 (1961). (Equi Diagram, Meta Phases; Experimental)

    Google Scholar 

  24. R.J. Wasilewski,Trans. AIME, 221, 647 (1961); quoted from [66Nie]. (Equi Diagram, Meta Phases; Experimental)

    Google Scholar 

  25. G. Brauer, H. Müller, and G. Kühner, “Oxides of Niobium and Tantalum Formed on Low Temperature Oxidation,”J. Less-Common Met., 4, 533–546 (1962). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  26. M. Hoch and M.R. Mathur, “Formation of Cubic ZrO2 with Transition Metals of Gr. V and VI and Their Oxides,”J. Am. Ceram. Soc, 45(8), 373–375 (1962). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  27. P. Kofstad, “On the Defect Structure of Ta2O5,”J. Electmchem. Soc, 109(9), 776–781 (1962). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  28. N. Norman, “Metallic Oxide Phases of Nb and Ta. I. X-Ray Investigation,”J. Less-Common Met, 4, 52–61 (1962). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  29. N. Norman, P. Kofstad, and O.J. Krudtta, “Metallic Oxide Phases of Nb and Ta. H. Metallographic Studies,”J. Less-Common Met., 4, 124–137 (1962). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  30. R.E. Pawel, J.V. Cathcart, and J.J. Campbell, “Oxide Platelet Formation in Ta Single Crystals,”Acta Metall, 10, 149 (1962). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  31. L.J. Fiegel, G.P. Mohanty, and J.H. Healy, “Equilibrium Studies of Refractory Metal Oxides, Final Report June 15, 1961-June 14, 1963,” Rep. LRR41, A.O. Smith Corporation, Long Range Research Lab., Milwaukee (1963). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  32. E.J. Huber, Jr., E.L. Head, C.E. Holly, Jr., and A.L. Bowman, “Heat of Formation of Tantalum Carbides,”J. Phys. Chem., 67, 793–796 (1963). (Thermo; Experimental)

    Article  Google Scholar 

  33. P. Kofstad, “The Oxidation Behavior of Ta at 7003–1000 °C,”J. Electmchem. Soc, 110(6), 491–501 (1963). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  34. L.B. Dubrovskaya, G.P. Shveikin, and P. V. Gel’d,The Ta-Ta2O5 System,”Zh. Neorg. Khim., 9(5), 1182 (1964)inRussian;TR:Russ. J. Inorganic Chem., 9(5), 647–649 (1964). (Equi Diagram, Meta Phases; Experimental)

    Google Scholar 

  35. E. Gebhardt, E. Fromm, and D. Jakob, “Processes of Degassing of Nb and Ta,”Z Metallkd., 55(8), 432–444 (1964) in German. (Thermo; Experimental)

    Google Scholar 

  36. P. Kofstad, “Low-Pressure Oxidation of Ta at 13003–1800 °C,”J. Less-Common Met., 7, 241–266 (1964). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  37. A.N. Kornilov, V.Ya. Leodinov, and S.M. Skuratov, “Standard Heat of Formation of Tantalum Pentoxide,”Zh. Fiz.Khim., 38(8), 2008–2012 (1964)inRussian.(Thermo;Experimental)

    Google Scholar 

  38. F. Laves and W. Petter, “A Displasive Transformation in aTa2O5,”Helv. Phys. Acta, 37, 617 (1964)inGerman. (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  39. K. Lehovec, “Lattice Structure of βTa2O5,”J. Less-Common Met., 7, 397–410 (1964). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  40. O.H. Krikorian and J.H. Carponter, “Enthalpies of Formation of Gaseous Tantalum Oxide and Tantalum Dioxide,”J. Phys. Chem., 69, 4399–4401 (1965). (Thermo; Experimental)

    Article  Google Scholar 

  41. R. Moser, “Growth of Single Crystals & Polymorphism of Nb2O5 and Ta2O5,”Schweiz. Mineral. Petmgr. Mitt., 45(1), 35–101 (1965) in German. (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  42. S. Steeb and J. Renner, “Electron Diffraction of Ta Suboxides (TaO2) (Ta2O),”J. Less-Common Met, 9, 181–189 (1965) in German. (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  43. J. Drowart, A. Pattoret, S. Smoes, F. Degreve, and D. Detry, “Thermodynamics and Kinetic Studies in High Temperature Chemistry,”Ad. in Mass Spectmscopy, 3, W.L. Mead, Ed., The Institute of Petroleum, London, 931–943 (1966) in French. (Thermo; Experimental)

    Google Scholar 

  44. E. Fromm,On the T-C Representation of the Nb-O andTa-O Systems, Z. Metallkd., 57, 540–545 (1966). (Thermo; Experimental)

    Google Scholar 

  45. V.I. Khitrova, “Electron Diffraction Study of Some CubicTa Oxides in Thin Films,”Kristallografia, 11(2), 204–212 (1966) in Russian; TR:Sov. Phys. Crystallogr., 11(2), 199 (1966). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  46. J. Niebuhr, “Suboxides of Ta,”J. Less-Common Met, 10, 312–322 (1966) in German. (Crys Structure; Review)

    Article  Google Scholar 

  47. S. Steeb and J. Renner, “Determination of the Structure of the Ta Suboxides (TaOy) (Ta32O9),”J. Less-Common Met, 10, 246–249 (1966). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  48. J. Stringer, “Void Formation During Oxidation of Ta,”J. Less-CommonMet, 11, 111–118 (1966). (Equi Diagram, MetaPhases; Experimental)

    Article  Google Scholar 

  49. W.L. Worrel, “Measurements of the Thermodynamic Stabilities of the Nb and Ta Oxides Using a High-Temperature Galvanic Cell,”Thermodynamics, (Proc. Symp., Vienna, 1965), 1, IAEA, Vienna, 131 (1966); quoted from [72Ger]. (Thermo; Experimental)

    Google Scholar 

  50. E. Fromm and H. Jehn, “Steady States During Annealing Nb and Ta in O,”Z. Metallkd., 58(1), 61–66 (1967) in German. (Thermo; Experimental)

    Google Scholar 

  51. D.R. Kudark and M.J. Sienko, “Solid-State Studies of O-Deficient Ta2O5,”Inorganic Chem., 6, 880–884 (1967). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  52. T. Nakayama and T. Osaka, “Structure of Oxide Film Formed on TaSurfaceby Wet Oxidation,”Rep. CastRes. Lab., Waseda Univ.,No. 18,29–33 (1967). (Equi Diagram, Meta Phases; Experimental)

  53. J. Spyridelis, P. Delavignette, and S. Amelinckx, “The Superstructure of Ta2O5 and Nb2O5,”Phys. Status Solidi, 19, 683–704 (1967). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  54. S. Steeb and J. Renner, “Electron Diffraction Examination About the Contribution of Oxygen Atoms in Nb and Ta,”Metall, 21(2), 93–97 (1967) in German. (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  55. J. Stringer, “The High Temperature Oxidation of Ta Single Crystals,”J. Less-Common Met, 12, 301–317 (1967). (Equi Diagram, Meta Phases ; Experimental)

    Article  Google Scholar 

  56. N. Terao, “Structure of Ta Oxides,”Jpn. J. Appl. Phys., 6, 21–34 (1967) in French. (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  ADS  Google Scholar 

  57. V.G. Dneprova, T.N. Rezukhiva, and Ya.I. Gerasimov, “Thermodynamic Properties of Higher Oxides of Ta,”Zh. Fiz.Khim., 42(6), 1532–1535 (1968) in Russian; TR:Russ. J. Phys. Chem., 42(6), 802–804 (1968). (Thermo; Experimental)

    Google Scholar 

  58. S. Ignatowicz and M. W. Dvies, “ The Free Energy of Formation of Nb2O5 and Ta2O5,”J. Less-Common Met, 15, 100–102 (1968). (Thermo; Experimental)

    Article  Google Scholar 

  59. V.I. Khitrova, V.V. Klechkovskaya, and Z.G. Pinsker, “Electron Diffraction Study of Ta Dioxide in Thin Films,”Sov. Phys. Crystallogr., 12(6), 907–912 (1968). (Crys Structure; Experimental)

    Google Scholar 

  60. V.V. Klechkovskaya and V.I. Khitrova, “Electron Diffraction Study of the γ Phase in the Ta-O System,”Kristallografiya, 13, 523–526 (1968) in Russian; TR:Sov. Phys. Crystallogr., 13, 428–430 (1968). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  61. J. Van Landuyt and C.M. Wayman, “A Study of Oxide Plat Formation in Ta—I. Growth Characteristics and Morphology,”Acta Metall, 16, 803–814 (1968). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  62. J. Van Landuyt and C.M. Wayman, “The Habit Plant of the Suboxide Phases TaOy and TaOz,”J. Less-Common Met, 14(2), 248–250 (1968). (Equi Diagram, Meta Phases ; Experimental)

    Article  Google Scholar 

  63. J.L. Waring and R.S. Roth, “Effect of Oxide Additions on the Polymorphism of Ta2O5 (System Ta2-TiO2,”J. Res. Nat. Bur. Stand., A, 72(2), 175–186 (1968). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  64. C.M. Wayman and J. Van Landuyt, “A Study of Oxide Formation in Ta—II. Crystallographic Analysis,”Acta Metall, 16, 815–822 (1968). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  65. A. Aladjem, D.G. Brandon, J. Yahalom, and J. Zahavi, “Phase Transformations in Refractory Oxide Films under EB Heating,” Rep IA-1189, Isr. At. Energy Comm., 32 (1969). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

  66. M.P. Usikov and A.G. Khachaturyan, “Diffraction Electron Microscopic Study of Interstitial Impurity Ordering in Ta,”Sov. Phys. Crystallogr., 13(6), 910–918 (1969). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  67. G.M. Wolten and A.B. Chase, “Ta Oxide Crystal Growth,”Z. Kristallogr, Kristallgeometr., Kristallphys., Kristallchem., 129(5–6), 365–368 (1969). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  ADS  Google Scholar 

  68. S.I. Alyamovskii, G.P. Sheveikin, and P.V. Gel’d, “Phase Compositions of Reaction Products of V, Nb, Ta with their Higher Oxides at Approximately 400 °C,”Akad. Nauk SSSR, Ural Fil. Tr. Inst. Khim., (17), 23–24 (1970) in Russian. (Equi Diagram, Meta Phases, Crys Structure; Experimental)

  69. G.B. Barbi, “Electrochemical Determination of the Free Energy of Formation of Tantalum Oxide,”Z. Naturforsch, 254, 1515–1516 (1970). (Thermo; Experimental)

    ADS  Google Scholar 

  70. V.I. Khitrova and Z.G. Pinsker, “Electron Diffraction Investigation of the Phase Transition in Thin Films of Ta Oxides having a Perovskite-Like Structure,”Kristallografia, 15(3), 540–546 (1970) in Russian; TR:Sov. Phys. Crystallogr., 15(3), 455-60 (1970). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  71. R.S. Roth and J.L. Waring, “Effect of Oxide Additions on the Polymorphism of Ta2O5. III. ‘Stabilization’ of Low Temperature Structure Type,”J. Res. Bur. Stand, Sect. A, 74(4), 485–493 (1970). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  72. R.S. Roth, J.L. Waring, and H.S. Parker, “Effect of Oxide Additions on the Polymorphism of Ta2O5. IV. System Ta2O5-Tantalum Tungstate (VI),”J. Solid State Chem., 2, 445 (1970). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  ADS  Google Scholar 

  73. R. Kirchheim, Dissertation, Tech. Hochschule, Stuttgart, F.R.G. (1961); quoted from[72Jeh].(Thermo;Experimental)

  74. T. Nakayama and T. Osaka, “Structure of Corrosion Resisting Films Formed on Ta and Nb in High Temperature Dilute Acid Aqueous Solutions,”Nippon Kinzoku Gakkaishi, 35(1), 35–49 (1971) in Japanese. (Equi Diagram, Meta Phases; Experimental)

    Google Scholar 

  75. N.C. Stephenson and R.S. Roth, “Structure Systematics in the Binary System Ta2O5-WO3 V. The Structure of Low Temperature Form of Ta Oxide,”Acta Crystallogr. Sect. B, 27(5), 1037–1044 (1971). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  76. N.C. Stephenson and R.S. Roth, “Crystal Structure of High Temperature Form of Ta2O5,”J. Solid State Chem. 3(2), 145–153 (1971). (Crys Structure; Experimental)

    Article  ADS  Google Scholar 

  77. R. Ferro, “Crystal Structure and Density Data,”Atomic Energy Review, Special Issue (3) Tantalum: Physico-Chemical Properties of its Compounds and Alloys, O. Kubaschewski, Ed., IAEA, Vienna (1972). (Crys Structure; Review)

    Google Scholar 

  78. Ya.I. Gerasimov and V.I. Lavrentev, “Thermochemical Properties,”Atomic Energy Review, Special Issue (3) Tantalum: Physico-Chemical Properties of its Compounds and Alloys, O. Kubaschewski, Ed., IAEA, Vienna (1972). (Thermo; Review)

    Google Scholar 

  79. O. Von Goldbeck and D.T. Livey, “Phase Diagrams,”Atomic Energy Review, Special Issue (3) Tantalum: Physico-Chemical Properties of its Compounds and Alloys, O. Kubaschewski, Ed., IAEA, Vienna (1972). (Equi Diagram, Meta Phases; Review)

    Google Scholar 

  80. H. Jehn and E. Olzi, “High Temperature Solid Solubility Limit and Phase Studies in the System Ta-,”J. Less-Common Met., 27, 297–309 (1972). (Equi Diagram, Meta Phases, Crys Structure; Experimental;#)

    Article  Google Scholar 

  81. V.I. Khitrova, V.V. Klechkovskaya, and Z.G. Pinsker, “Electron Diffraction Study on the Atomic Structure of Orthorhombic Ta Oxide in Thin Films,”Kristallografiya, 17(3), 506–513 (1972) in Russian; TR:Sov. Phys. Crystallogr., 17(3), 442–447 (1972). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  82. T.N. Rezukhina and L.J. Kravchenko, “The Thermodynamic Properties of Laves Phases in Mixtures of Ta + Co Solid Electrolyte Galvanic Cell Studies,”J. Chem. Thermodyn., 4, 655–667 (1972). (Thermo; Experimental)

    Article  Google Scholar 

  83. N. Harris, A. Taylor, and J. Stringer, “Kossel Microdiffraction Studies of TaO2,“Acta Metall, 21, 1677–1683 (1973). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  84. A.G. Khachaturyan, “The Problem of Symmetry in Statistical Thermodynamics of Substitutional and Interstitial Ordered Solid Solutions,”Phys. Status SolidiB, 60, 9–37 (1973). (Equi Diagram, Meta Phases; Experimental)

    Article  ADS  Google Scholar 

  85. W.N. Knausenberger and R.N. Tauber, “Selected Properties of Pyrolytic Ta2O5 Films,”J. Electrochem. Soc, 120, 927–931 (1973). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  86. I. McKee and G.R. Wallwork, “The Oxidation of Ta and Nb in the Temperature Range 400–600 °C,”J. Less-Common Met., 30, 249–258 (1973). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  87. W. Nickerson, Ph.D. thesis, Univ. of Illinois, Urbana, IL(1979); quoted from [73Nic2]. (Equi Diagram, Thermo; Experimental)

  88. W. Nickerson and C. Altstetter, “Thermodynamic Properties of Ta-O Solid Solution,”Scr. Metall., 7, 377–382 (1973). (Thermo; Experimental)

    Article  Google Scholar 

  89. S. Stecura, “Observation of Oxide Particles below the Apparent Oxygen Solubility Limit in Ta,”Metall. Trans., 5, 1337–1340 (1974). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  90. J.E. Stroud, W.C. Tripp, and J.M. Wimmer, “Defect Structure of Ta2O5,”J. Am. Ceram. Soc, 57, 172 (1974). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  91. E. Fromm and R. Kirchheim, “EMF Measurements in O-Group Va Metals Systems Using a ThO2-Y2O3 Solid Electrolyte,”Z. Metallkd., 66(3), 144–150 (1975) in German. (Equi Diagram, Meta Phases, Thermo; Experimental)

    Google Scholar 

  92. G. Hörz, E. Fromm, “Tantalum,”Gases and Carbon in Metals, E. Fromm and E. Gebhardt, Ed., Springer, Berlin, 94 (1976) in German; quoted from [81Hor]. (Equi Diagram, Meta Phases, Thermo; Review;#)

    Google Scholar 

  93. V.I. Khitrova, V.V. Klechkovskaya, and Z.G. Pinsker, “Study of the Structure of Monoclinic Ta Oxide by Electron Diffraction,”Kristallografia, 21(5), 937–942 (1976) inRussian;TR:Sov. Phys. Crystallogr., 21(5), 535–538 (1976). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  94. S. Smoes, J. Drowart, and C.E. Myers, “Determination of Atomization Energies of the Molecules TaO(v) and TaO2(v) by the Mass-Spectrometric Knudsen Cell Method,”J. Chem. Thermodyn., 8, 225–239 (1976). (Thermo; Experimental)

    Article  Google Scholar 

  95. K. Nishida and M. Hachinoche, “High Temperature Oxidation of Aluminized Ta Sheets,”Hyomen Gijutsu, 28(11), 570–574 (1977) in Japanese; (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  96. R. Lauf and C. Altstetter, “Thermodynamic Properties ofNb-Ta-O Solid Solutions,”Scr. Metall., 77(11), 983–985 (1977). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  97. F.F. Milillo and D.I. Potter, “Interstitial Ordering and Precipitation in Dilute Ta-O Alloys at 100–270°C,”Metall. Trans. A, 9, 283–290 (1978). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  98. F. Izuki and H. Kodama, “A New Modification of Ta(V) Oxide,”J. Less-Common Met, 63, 305–307 (1979). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  99. G. Hörz, “Precipitation Processes in Supersaturated Ta-O Solid Solutions. Hardness Changes-Precipitates,”Acta Metall, 27, 1893–1906 (1979). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  100. V.I. Khitrova, V.V. Klechkovskaya, and Z.G. Pinsker, “Structure of Ta Oxides with Hexagonal Lattice in Thin Layers,”Kristallografia, 24(5), 537–539 (1980). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  101. G. Boureau and P. Gerdanian, “High Temperature Thermodynamics of Solutions of Oxygen in V, Nb and Ta,”J. Phys. Chem. Solids, 42(9), 749–753 (1981). (Equi Diagram, Meta Phases, Thermo; Experimental)

    Article  ADS  Google Scholar 

  102. G. Horz, H. Speck, E. Fromm, and H. Jehn, “Gases and Carbon in Metals. Thermo., Kinetics and Properties,” Part IX, Gr VA Met-als(3)Ta,Phys. Daten/Phys. Data(5–9), 78p (1981). (Equi Diagram, Meta Phases ; Review)

    Google Scholar 

  103. V.I. Khitrova and V.V. Klechkovskaya, “Phase Formation and Atomic Structure of Hexagonal δ’ Ta Oxide,”Kristallografia, 25(6), 1169–1175 (1980) in Russian; TR:Sov. Phys. Crystallogr, 25(6), 669–672 (1981). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  104. U. Balachandra and N.G. Eror, “AStudy of the Crystal Structure of the βTa2O5 by Vibrational Spectroscopy and XRD,”J. Mater. Sci. Lett., 1, 219–222 (1982). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  105. U. Balachandra and N.G. Eror, “Thermodynamic Study of the Defect Structure of βTa2O5,”J. Less-Common Met., 84, 291–299 (1982). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  Google Scholar 

  106. V.I. Khitrova and V. V. Klechkovskaya, “Electron Diffraction Investigation of the Thin Layers of Tetragonal Ta Oxides,”Kristallografia, 27(4), 736–741 (1982)inRussian;TR:Sov.Phys.Crystallogr., 27(4), 441–444 (1982). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

  107. V.I. Khitrova, “Structural Aspect of the Mechanism of Oxidation of Group VA Transition Metals in Equilibrium Conditions. I” and “Structural Aspect of the Mechanism of Oxidation of Group VA Transition Metals in Nonequilibrium Conditions. II,”Kristallografia, 28, 896–904, 905–909 (1983) in Russian; TR:Sov. Phys. Crystallogr, 28(5), 531–536,536–539 (1983). (Equi Diagram, Meta Phases, Crys Structure; Review)

    Google Scholar 

  108. J.B. Pedley and E.M. Marshell, “Thermochemical Data for Gaseous Monoxides,”J. Phys. Chem. Ref. Data, 12(4), 967–1031 (1983). (Thermo; Review)

    Article  ADS  Google Scholar 

  109. Y. Syono, M. Kikuchi, T. Goto, and K. Fukuoka, “Formation of Rutile Type Ta(IV)O2 by Shock Reduction and Cation Deficient Ta(0.8)O2 by Subsequent Oxidation,”J. Solid State Chem., 50, 133–137 (1983). (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Article  ADS  Google Scholar 

  110. O.M. Sreedharan and C. Mallika, “A Compilation of Gibb’s Energy Data for 40 Metal Oxide Buffers,” Rep. RRC-69, Reactor Research Center, Kalpakkam, India, 34p(1984). (Thermo; Review)

    Google Scholar 

  111. D.Yu. Zhogin, P.N. Tolmach, E. A. Kasarukma, and V.P. Kolesov, “Heat Capacity and Thermodynamic Functions of Orthorhombic Ta2O5 at 7.46 to 303.26 K,”Zh. Fiz. Khim., 59(10), 2410–2413 (1985) in Russian. (Thermo; Experimental)

    Google Scholar 

  112. M.W. Chase, Jr., C.A. Davies, J.R. Downey, Jr., D.J. Frurip, R.A. McDonald, and A.N. Syverud,JANAF Thermochemical Tables, Third Edition, Part II, Cr-Zr, American Chemical Society, American Institute of Physics and National Bureau of Standards, New York (1986). (Equi Diagram, Meta Phases, Thermo; Review)

    Google Scholar 

  113. J.S. Lee and C.J. Altstetter, “Thermodynamic Studies of Oxygen Behavior in Ta-Based Alloys,”ActaMetall, 34(1), 139–145 (1986). (Equi Diagram, Meta Phases, Crys Thermo; Experimental)

    Google Scholar 

  114. P.I. Tolmach, K.S. Gavrichev, and V.E. Gorbunov, “Heat Capacity and Thermodynamic Properties of High Temperature Modifications of αTa2O5 at 10–320 °C,”Zh. Fiz. Khim., 61(2), 361–365 (1987) in Russian. (Thermo; Experimental)

    Google Scholar 

  115. R. Bredesen and P. Kofstad, “A Reinterpretation of the Defect Structure of LTa2O5,”Solid State Ionics, 27, 11–18 (1988). (Equi Diagram, Meta Phases; Experimental)

    Article  Google Scholar 

  116. L.D. Miroshnikova, C.I. Alyamovsky, V.A. Perelyaev, A.S. Fedukov, and G.P. Sheveikin, “Phase Formation in the Ta-Ta2O5 System Under Thermobaric Conditions,”Zh. Neorg. Khim., 34(1), 184–187 (1989) in Russian. (Equi Diagram, Meta Phases, Crys Structure; Experimental)

    Google Scholar 

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An erratum to this article is available at https://doi.org/10.1007/BF03034332.

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Garg, S.P., Krishnamurthy, N., Awasthi, A. et al. The O-Ta (Oxygen-Tantalum) system. JPE 17, 63–77 (1996). https://doi.org/10.1007/BF02648373

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