Ferroelectric properties of the tungsten bronze M2+6M4+2Nb8O30 solid solution systems
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Investigation of tungsten bronze ferroelectric ceramic by conventional and mechanical activation processes
2022, Materials Today: ProceedingsCitation Excerpt :XRD pattern of BCTN multiferroic ferroelectric ceramic; observed at room temperature is shown in Fig. 3. The relative intensity and peak positions for XRD diffraction confirms the formation of a single-phase tetragonal structure with space group P4bm confirmed with JCPDS card no. 00–039-0258 [9]. Ganguly et al reported in BSTN nanocrystalline ferroelectric ceramics XRD patterns of the sintered sample for different durations reveal the formation of single-phase compounds.
Simultaneously enhanced ferroelectric and magnetic properties in Fe-substituted Ba<inf>4</inf>Sm<inf>2</inf>Fe<inf>x</inf>Ti<inf>4-2x</inf>Nb<inf>6+x</inf>O<inf>30</inf> ceramics
2019, Journal of Alloys and CompoundsCitation Excerpt :In TTBs, B-sites have significant effects on their physical properties. According to Neurgaonkar et al. and Chi et al. the Curie temperature (Tc) would shift to lower temperature with increasing average ionic radius of B-sites in Ba6M4+2Nb8O30 (M = Ti, Sn, Hf and Zr) [12,13]. As of now, even though there is no literature reporting the direct relationship between the coercive field and Curie temperature in TTB compounds, such an assumption is proposed here and will be confirmed in this work.
Preparation, structure analysis and dielectric characteristics of the novel ferroelectric ceramics (1−x)Sr<inf>3.35</inf>Ba<inf>1.65</inf>Nb<inf>10</inf>O<inf>30</inf> (SBN) - (x)Ba<inf>4</inf>Na<inf>2</inf>Nb<inf>10</inf>O<inf>30</inf> (BNN) with potassium tungsten - bronze structure
2017, Journal of Alloys and CompoundsStructure and upconversion analyses of Er<sup>3+</sup>-doped Ba<inf>6</inf>Ti<inf>2</inf>Nb<inf>8</inf>O<inf>30</inf>-Sr<inf>6</inf>Ti<inf>2</inf>Nb<inf>8</inf>O<inf>30</inf> solid solutions
2015, Ceramics InternationalCitation Excerpt :In addition, it is worth noting that Rietveld structural refinements with space group P4/mbm and Cmm2 for SBTNx (0≤x≤3) and SBTNx (3.5≤x≤5.91) were also respectively carried out, however, no reasonable results can be obtained. It is believed that the substitution of Ba2+ ions by Sr2+ ions can lead to larger structural flexibility in SBTNx solid solutions due to the small ionic radius of Sr2+ ions [11–12], which may be the driving force for the structure changing from TE-FTB to OR-FTB structure with the increasing of x as confirmed by the above Rietveld structural refinement. For clarity, Fig. 2(a) and (b) display respectively the schematic diagrams of ions sitting in the TE-FTB and OR-FTB unit cells of SBTNx, in which FTB structure consists of a complex array of distorted (B1/B2)O6 octahedra sharing corners in such a way that three different types of interstices (square A1, pentagonal A2, and trigonal C) available.
Novel high dielectric constant and low-loss tetragonal tungsten bronze dielectrics Ba<inf>5</inf>LnMgNb<inf>9</inf>O<inf>30</inf> (Ln=La, Nd, Sm, Gd and Yb)
2014, Ceramics InternationalCitation Excerpt :The TB structure in the general formula (A1)2(A2)4(C)4(B1)2(B2)8O30 consists of the corner-linked BO6 and three types of channels (square A1, pentagonal A2 and triangle C) which are available for cations occupying. The flexibility of the TB framework can tolerate stuffed (A–C sites are fully occupied), filled (A sites are fully occupied) and unfilled (A sites are partially occupied) occupancy of the channels, allowing for precisely tuning their physical properties [6–8]. Generally, ceramics with a filled TB structure is more stable [9] than its counterparts and do not easily suffer from optical damage when exposed under certain power levels at room temperature [10].