Structure and negative thermal expansion in the PbTiO3-BiFeO3 system

被引：109
|
作者：
Chen, J.
Xing, X. R. [1 ]
Liu, G. R.
Li, J. H.
Liu, Y. T.
机构：
[1] Univ Sci & Technol Beijing, Dept Chem Phys, Beijing 100083, Peoples R China
[2] China Inst Atom Energy, Beijing 102413, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 10期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1063/1.2347279
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The structures of (1-x)PbTiO3-xBiFeO(3) (x=0.3 and 0.6) were investigated by means of the neutron powder diffraction. A splitting shift between Fe and Ti atoms was found along the c axis in 0.7PbTiO(3)-0.3BiFeO(3); however, this splitting does not appear in 0.4PbTiO(3)-0.6BiFeO(3). The tetragonal phase of PbTiO3-BiFeO3 exhibits a large spontaneous polarization. The negative thermal expansion of PbTiO3 is significantly enhanced in a wide temperature range by the BiFeO3 substitution. The average bulk thermal expansion coefficient of 0.4PbTiO(3)-0.6BiFeO(3) is < over bar > a </over bar >(v)=-3.92x10(-5) degrees C-1, which is much strong in the known negative thermal expansion oxides. (c) 2006 American Institute of Physics.
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页数：3
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