The observations of lattice vibrations are mainly on the ferroelectric phase.
晶格振动的观察主要集中在铁电相。
The recent progress in studies of the ferroelectric phase transition and relaxor characteristics of Na_ 0.
基无铅铁电材料在铁电相变和弛豫特性方面近年来国内外的研究进展。
These experimental results evidence a low temperature ferroelectric -ferroelectric phase transition in these crystals.
这些实验结果证明，该晶体存在低温铁电-铁电相变。
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