Phase Transitions in Ba4Nb2O9.

被引：0
|
作者：
Leshchenko, P.P.
Lykova, L.M.
Kovba, L.M.
Stefanovich, S.Yu.
Chechkin, V.V.
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来源：
Neorganiceskie materialy | 1985年 / 21卷 / 02期
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CRYSTALS - Structure - LIGHT - Nonlinear Optical Effects;
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摘要：
It is established that barium niobate (Ba//4Nb//2O//9) depending on the synthesis temperature (below or above 1400 K), crystallizes in two polymorphic hexagonal modifications - alpha and beta **1. The beta **1 modification is characterized by the presence of reversible phase transformations related to a slight distortion of its structure. Two modifications of barium niobate existing below 120 K and in the 120-520 K range possess polar properties (a pyroelectric effect, second optical harmonic generation).
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页码：278 / 281
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