Synthesis and electrical properties of Bi2V1-xGexO5+y solid solutionsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A continuous series of Bi2V1-xGexO5+y solid solutions has been prepared by solid-state reactions, and their polymorphism and electrical properties have been studied. The solid solutions with 0 < x <= 0.2 are isostructural with the monoclinic phase alpha-Bi2VO5.5, and those with 0.2 < x <= 0.3 are isostructural with the orthorhombic phase. In the range 0.6 <= x < 1, the solid solutions have the orthorhombic Bi2GeO5 structure. The solid solutions with 0.4 <= x <= 0.5 have a tetragonal structure. Increasing the germanium content suppresses the ferroelectric phase transition in the Bi2VO5.5-based solid solutions, without changing the transition temperature. With increasing vanadium content, the conductivity of the solid solutions gradually increases, from 3 x 10(-5) (x = 1) to 3 x 10(-1) S/cm (x = 0) at 550 degrees C.