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组份变化对PZST陶瓷反铁电-铁电相变的影响

杨同青 , 姚熹 , 张良莹

无机材料学报

对ＦＥ－ＡＦＥ相界附近ＰＺＳＴ陶瓷结构、性能及场诱相变临界参数随组份和温度的变化进行了研究，在相变临界温度ＴＦＥ－ＡＦＥ以下，被电场诱导出的铁电态在撤去电场后以亚稳态形式存在；随着温度升高，亚稳铁电态在此温度转变为反铁电态．随着Ｔｉ含量的增加，样品由四方反铁电相穿越相界转变为三方铁电相，介电常数峰值ε_ｍａｘ增大；同时亚稳铁电态→反铁电态相变温度Ｔ_{ＦＥ－ＡＦＥ}上升，电场诱导的 ＡＦＥ→ＦＥ相变临界参数 Ｅ_{ＡＦＥ－ＦＥ}、E_{ＦＥ－ＡＦＥ}减小．实验中发现Ｅ_{ＡＦＥ－ＦＥ}和ΔＥ分别与Ｔ_{ＦＥ－ＡＦＥ}和Ｔ_ｃ相关，随着Ｔ_{ＥＦ－ＡＦＥ}的升高和Ｔ_ｃ的降低，Ｅ_{ＡＦＥ－ＦＥ}和ΔＥ相应减小．

关键词: 反铁电 , electric field-induced phase transition , metastable state , ceramics

GRAIN BOUNDARY REORGANIZATION IN INTERMETALLIC COMPOUNDS NiAl AND FeAl

M.D. Starostenkov , B. F. Demyanov , E.A. Kuklina and E. G. Sverdlova General Physics Department , Altai State Technical University , Lenin st 46 , Barnaul , 656099 , Russia

金属学报(英文版)

Computer simulation of grain boundaries(GB) was carried out in Fe and ordered alloys NiAl and FeAl with B2 superlattice. In this work symmetrical tilt grain boundaries =5[100](012) and = 5[100](013) are studied. The atomic interaction has been described by Morse empirical central- force potentials.The atomic structure and energy of GB were investigated by means of construction of -surface using full atomic relaxation by method of molecular statics. It is shown that = 5 tilt GBs in Fe, Ni3Al and NiAl have several steady states. Comparison of our results with geometrical model of coincidence site lattice (CSL) was carried out. GBs in model CSL are unstable, the stabilization is achieved by additional displacement at some vector along the plane of defect.

关键词: grain boundary , null , null , null , null

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