Phase Stability of Bi 2 ( V 1 x ME x ) O 5 : 5 þ ( ME 1⁄4 Li and Ag , x 1⁄4 0 : 05 and 0 . 1 )

Content Provider	Semantic Scholar
Author	Taninouchi, Yu-Ki Uda, Tetsuya Ichitsubo, Tetsu Awakura, Yasuhiro Matsubara, Eiichiro
Copyright Year	2010
Abstract	The phase transition of high oxide-ion conductor Bi2(V1 xMEx)O5:5þ (ME 1⁄4 Li and Ag, x 1⁄4 0:05 and 0.1) and its long-term phase stability against thermal decomposition have been studied. The transition behavior was determined by differential scanning calorimetry (DSC) as well as high-temperature X-ray diffraction (HT-XRD) analysis. The observed thermal and structural changes during temperature scans reveal the temperature dependence of electrical conductivity. Liand Ag-doping do not sufficiently suppress thermal decomposition at intermediate temperatures between 400 and 600 C. In particular, partial decomposition was detected in Bi2(V0:9Ag0:1)O5:3 during a temperature scan by HT-XRD analysis, which explains the distinct change in electrical conductivity. We have generated pseudo-binary phase diagrams for Bi2(V1 xMEx)O5:5þ based on the X-ray diffraction analysis of powders annealed for 200 h and differential thermal analysis. The thermodynamically stable region of Bi2(V1 xMEx)O5:5þ is not sufficiently expanded by Liand Ag-doping. At around 500 C, Bi2(V1 xMEx)O5:5þ is metastable, although it shows the highest oxide-ion conductivity among solid oxides. [doi:10.2320/matertrans.M2009348]
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Alternate Webpage(s)	http://www.jim.or.jp/journal/e/pdf3/51/03/561.pdf
Language	English
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Resource Type	Article