摘要
仔细研究了电场感应PbZrO3铁电相的晶体结构。在PbZrO3处于反铁电相时，各离子位移方向与极轴垂直。在外电场感应下，Pb离子沿极轴方向有相同方向0．17A的位移，从而使晶体呈现铁电相特征，发生反铁电-铁电相变。此铁电相称之为电场感应铁电相（EFI，Electric—Field—Induced）。通过结构对称性分析，确定EFI铁电相的对称性是C2mm（G2v），用极矢量Ps作为序参量来描述相变时对称性的变化是合适的。
The structure of electric- field -induced PbZrO3 ferroelectric phase has been studied in detail. The polar axis was found to be orthogonal to the direction of atomic displacements in the initial antiferroelctric phase. The ferroeletric properties of the phase are due to a Pb displacement of about 0.17A relative to the oxygen framework along the polar axis in the effect of applying the electric field, and there was a phase transition of PbZrO3 from Antiferroeletrice to ferroelectric which was called electric - field - induced ferroelectric phase （EFI）. By an analysis of structural symmetry, the symmetry group of EFI PbZrO3 ferrroelectric Phase was ascertained to be C2v. The polar vector Ps was chosen to be the order parameter of this phase transition.
出处
《中国材料科技与设备》
2006年第5期71-72,77,共3页
Chinese Materials Science Technology & Equipment
关键词
反铁电相
电场感应铁电相
对称性
序参量
Antiferroelectric
EFI Ferroelectric
Symmetry
Order Parameter
