THE ANTIFERROELECTRIC CRYSTAL-STRUCTURE OF THE HIGHLY ORDERED COMPLEX PEROVSKITE PB(YB1/2NB1/2)O3

被引:95
作者
KWON, JR
CHOO, WK
机构
[1] Dept. of Mater. Sci. and Eng., Korea Adv. Inst. of Sci. and Technol., Seoul
关键词
D O I
10.1088/0953-8984/3/13/017
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The crystal structure of antiferroelectric Pb(Yb1/2Nb1/2)O3 has been characterized. Both x-ray diffraction and transmission electron diffraction show two sets of superlattice reflections originating respectively from the B-site atom ordering and the antiparallel lead-atom displacements which suffer within the orthorhombic a(o)-b(o) plane along the a(o) direction. The room-temperature crystal symmetry is considered to be orthorhombic with space group Pbnm (D2h16) and lattice parameters a(o) = 5.918 angstrom, b(o) = 23.453 angstrom and c(o) = 8.221 angstrom. High-resolution electron microscopy confirms the diffraction results. A structural phase transition from the lower-symmetry phase to the cubic paraelectric phase occurs at about 302-degrees-C on heating.
引用
收藏
页码:2147 / 2155
页数:9
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