Polymorphism and Properties of Bi2W1-xMoxO6 Aurivillius Phasesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A continuous series of Bi2W1-xMoxO6 solid solutions between the n = 1 Aurivillius phases Bi2WO6 and Bi2MoO6 with a polar orthorhombic structure (gamma-phase) have been prepared by solid-state reactions at 850 (0 < x <= 0.3) and 530-640 degrees C (0.3 <= x < 1), and their thermal and electrical properties have been studied throughout their stability region, between room temperature and 960 degrees C, with the aim of gaining detailed insight into their polymorphism. The results demonstrate that the tungsten-rich (0 <= x <= 0.2) materials undergo a ferroelectric and a reconstructive phase transition like bismuth tungstate, Bi2WO6. The temperatures of both transitions decrease with increasing molybdenum content. The molybdenum-rich materials in the composition range 0.9 <= x <= 1 are similar in properties to bismuth molybdate, Bi2MoO6. In the composition range 0.3 <= x <= 0.8, neither ferroelectric nor reconstructive phase transition was detected.