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2021 | OriginalPaper | Buchkapitel

4. Technical Solutions for In Situ Monitoring of Ammonothermal Processes

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Abstract

Due to the thick-walled autoclaves, the ammonothermal system has long been regarded as a black box and the crystal quality was only improved through systematic, time-consuming experiments [1]. One of the main goals therefore was to bring “light into the dark” with new window design for the extreme process parameters of larger than 650 °C and simultaneously 300 MPa.

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Literatur
1.
Zurück zum Zitat N.S.A. Alt, E. Meissner, E. Schlücker, L. Frey, In situ monitoring technologies for ammonothermal reactors. Phys. Status Solidi 9, 436–439 (2012) N.S.A. Alt, E. Meissner, E. Schlücker, L. Frey, In situ monitoring technologies for ammonothermal reactors. Phys. Status Solidi 9, 436–439 (2012)
2.
Zurück zum Zitat W.F. Sherman, A.A. Stadtmuller, Experimental Techniques in High‐Pressure Research (Wiley, 1987). ISBN 0‐471‐10313‐6 W.F. Sherman, A.A. Stadtmuller, Experimental Techniques in High‐Pressure Research (Wiley, 1987). ISBN 0‐471‐10313‐6
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Zurück zum Zitat R. Whyman, Laboratory Methods in Vibrational Spectroscopy, ed. by H. A. Willis, J. H. van der Maas, R. G. J. Miller, Wiley (1987) R. Whyman, Laboratory Methods in Vibrational Spectroscopy, ed. by H. A. Willis, J. H. van der Maas, R. G. J. Miller, Wiley (1987)
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Zurück zum Zitat A.T. Larson, The ammonia equilibrium at high pressures. J. Am. Chem. Soc. 46, 367–372 (1924)CrossRef A.T. Larson, The ammonia equilibrium at high pressures. J. Am. Chem. Soc. 46, 367–372 (1924)CrossRef
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Zurück zum Zitat H. Baser, W. Schwieger, D. Freitag, T. Steigerwald, E. Schlücker, Solubility studies of sodium azide in liquid ammonia by in situ ultrasonic velocity measurement. Chem. Eng. Technol. 6, 1101–1106 (2017)CrossRef H. Baser, W. Schwieger, D. Freitag, T. Steigerwald, E. Schlücker, Solubility studies of sodium azide in liquid ammonia by in situ ultrasonic velocity measurement. Chem. Eng. Technol. 6, 1101–1106 (2017)CrossRef
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Zurück zum Zitat T. Steigerwald, J. Balouschek, B. Hertweck, A.C. Kimmel, N.S.A. Alt, E. Schluecker, In situ investigation of decomposing ammonia and ammonobasic solutions under supercritical conditions via UV/vis and Raman Spectroscopy. J. Supercrit. Fluids 134, 96–105 (2018)CrossRef T. Steigerwald, J. Balouschek, B. Hertweck, A.C. Kimmel, N.S.A. Alt, E. Schluecker, In situ investigation of decomposing ammonia and ammonobasic solutions under supercritical conditions via UV/vis and Raman Spectroscopy. J. Supercrit. Fluids 134, 96–105 (2018)CrossRef
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Zurück zum Zitat S. Schimmel, P. Duchstein, T. Steigerwald, A.C. Kimmel, E. Schlücker, D. Zahn, R. Niewa, P. Wellmann, In situ X-ray monitoring of transport and chemistry of Ga-containing intermediates under ammonothermal growth conditions of GaN. J. Cryst. Growth 498, 214–223 (2018)CrossRef S. Schimmel, P. Duchstein, T. Steigerwald, A.C. Kimmel, E. Schlücker, D. Zahn, R. Niewa, P. Wellmann, In situ X-ray monitoring of transport and chemistry of Ga-containing intermediates under ammonothermal growth conditions of GaN. J. Cryst. Growth 498, 214–223 (2018)CrossRef
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Zurück zum Zitat S. Schimmel, M. Koch, P. Macher, A.C. Kimmel, T. Steigerwald, N. Alt, E. Schlücker, P. Wellmann, Solubility and dissolution kinetics of GaN in supercritical ammonia in presence of ammonoacidic and ammonobasic mineralizers. J. Cryst. Growth 479, 59–66 (2017)CrossRef S. Schimmel, M. Koch, P. Macher, A.C. Kimmel, T. Steigerwald, N. Alt, E. Schlücker, P. Wellmann, Solubility and dissolution kinetics of GaN in supercritical ammonia in presence of ammonoacidic and ammonobasic mineralizers. J. Cryst. Growth 479, 59–66 (2017)CrossRef
Metadaten
Titel
Technical Solutions for In Situ Monitoring of Ammonothermal Processes
verfasst von
Eberhard Schlücker
Copyright-Jahr
2021
DOI
https://doi.org/10.1007/978-3-030-56305-9_4