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中文摘要：
本文研究了压电、铁电晶体中负离子配位多面体的结晶方位与形变，提出了压电晶体中同一种负离子配位多面体的结晶方位是一致的。在铁电晶体中，负离子配位多面体发生形变，伴随着晶体发生顺电一铁电相变，并从这一基本过程出发，对铁电体相变的形成机理进行了讨论。
英文摘要：
The orientation and distortion of anionic coordination-polyhedra in piezoelectric and ferroelectric crystals are studied in this article. It was put forward that the orientation of the same anionic coordination-polyhedra is consistent in piezoelectric crystal, and that the distortion of anionic coordination-polyhedra is accompanied by paraelectric-ferroelectric phase transition in ferroelectric crystal. The mechanism of phase transitions in ferroelectrics was discussed through this basic process.
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