菱晶
Addition of x volue reduces the crystal axis ratio a/ c and the volume of tetragonal structure. As a result, it extendes the tetragonal antiferroelectric field that can transform into rhombohedral ferroelectric phase by electric field.
x增加,反铁电四方相的晶轴比a/c和晶胞体积减小,结果是扩大了可以发生电场诱导反铁电-铁电相变的反铁电相区。
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