At low temperatures the compounds Bi2WO6 and Bi2MoO6, like many other related layered ferro-electrics, are electrically polar and transform to nonpolar state on heating. These phase transitions, however, are not ordinary ferroelectric ones and have a reconstructive nature. The two compounds undergo also additional phase transitions which are not accompanied with any noticeable changes in structure or polarization. Some physical properties of Bi2WO6 single crystals and Bi2MoO6 ceramics are studied and discussed.
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Yanovskiǐ et al. (1986) studied this question.
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