Trivalent Ionic Conductivity of Perovskite-Type Y<i><sub>x</sub></i>(Ta<sub>3</sub><i><sub>x</sub></i>W<sub>1-3</sub><i><sub>x</sub></i>)O<sub>3</sub>
Naoya SakaiKenji TodaMineo Sato
Abstract
Solid solutions of Yx(Ta3xW1-3x)O3 (0≦x≦0.33) with a highly A-site deficient perovskite structure were prepared by a solid state reaction and were found to show a high trivalent ionic conductivity. The crystal structure of Yx(Ta3xW1-3x)O3 (0≦x≦0.33) was changed from a Y-ordered super-structure to a disordered structure with decreasing x. The high trivalent ionic conductivity of Yx(Ta3xW1-3x)O3 was observed in the disordered structure. The solid solution with x = 0.06 in Yx(Ta3xW1-3x)O3 exhibited the highest conductivity 2.58×10-5 Scm-1 at 635 K. The polarization data suggested strongly that Y3 + ions are the main mobile species in Yx(Ta3xW1-3x)O3. From the DC polarization measurement, the ionic transfer number of Yx(Ta3xW1-3x)O3 (x = 0.06) was found to be over 98%.
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