A Raman scattering study of the ferroelectric ordering in rhombohedral and tetragonal La-modified lead zirconate titanate ceramics

被引:44
作者
ElMarssi, M
Farhi, R
Dai, X
Morell, A
Viehland, D
机构
[1] UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801
[2] UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801
[3] THOMSON CSF,CENT RECH LAB,F-91404 ORSAY,FRANCE
关键词
D O I
10.1063/1.362844
中图分类号
O59 [应用物理学];
学科分类号
摘要
A Raman study of La-doped lead zirconate titanate ceramics with La/Zr/Ti ratios of 9/65/35 and 12/40/60 has been undertaken in order to compare the onset of ferroelectric order in these two compositions. Some features, such as a splitting of a threefold degenerate T-1u mode of the cubic structure into at least two lines or an enhancement of the T-2u mode, can be considered as the signature of the occurrence of some ferroelectric order below T-c congruent to 363 K in the 12/40/60 compound. Nevertheless, the Raman spectra obtained for the two ceramics are very similar, and no significant narrowing of the lines was observed in the ferroelectric phase of 12/40/60. It is thus suggested that the onset of long range order in this compound is not developed homogeneously in every direction of space, in agreement with previous transmission electron microscopy observations. The Raman scattering was dominately second order, with the broadening of the lines reflecting a distribution of the correlation function of the quasistatic polarization in reciprocal space, which was not sharply peaked at q=0 in all directions. (C) 1996 American Institute of Physics.
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页码:1079 / 1084
页数:6
相关论文
共 17 条
[1]   PRECURSOR ORDER AND RAMAN-SCATTERING NEAR DISPLACIVE PHASE-TRANSITIONS [J].
BRUCE, AD ;
TAYLOR, W ;
MURRAY, AF .
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1980, 13 (04) :483-504
[2]  
CROSS LE, 1987, FERROELECTRICS, V76, P241, DOI 10.2109/jcersj.99.829
[3]   THE SPONTANEOUS RELAXOR TO NORMAL FERROELECTRIC TRANSFORMATION IN LA-MODIFIED LEAD-ZIRCONATE-TITANATE [J].
DAI, XH ;
XU, Z ;
VIEHLAND, D .
PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1994, 70 (01) :33-48
[4]   A RAMAN AND DIELECTRIC SUSCEPTIBILITY STUDY OF SUPERPARAELECTRIC PLZT CERAMICS [J].
DELLIS, JL ;
DALLENNES, J ;
CARPENTIER, JL ;
MORELL, A ;
FARHI, R .
JOURNAL OF PHYSICS-CONDENSED MATTER, 1994, 6 (27) :5161-5168
[5]   A STRUCTURAL MODEL FOR THE RELAXOR PBMG1/3NB2/3O3 AT 5-K [J].
DEMATHAN, N ;
HUSSON, E ;
CALVARIN, G ;
GAVARRI, JR ;
HEWAT, AW ;
MORELL, A .
JOURNAL OF PHYSICS-CONDENSED MATTER, 1991, 3 (42) :8159-8171
[6]   POLAR FLUCTUATIONS AND 1ST-ORDER RAMAN-SCATTERING IN HIGHLY POLARIZABLE KTAO3 CRYSTALS WITH OFF-CENTER LI AND NB IONS [J].
DIANTONIO, P ;
VUGMEISTER, BE ;
TOULOUSE, J ;
BOATNER, LA .
PHYSICAL REVIEW B, 1993, 47 (10) :5629-5637
[7]  
FARHI R, IN PRESS FERROELECTR
[8]   SHELL-MODEL INVESTIGATION OF RAMAN-SCATTERING IN ORDERED AND DISORDERED PHASES OF NH4BR [J].
GEISEL, T ;
KELLER, J .
JOURNAL OF CHEMICAL PHYSICS, 1975, 62 (09) :3777-3783
[9]   POLARIZATION SWITCHING MECHANISMS AND ELECTROMECHANICAL PROPERTIES OF LA-MODIFIED LEAD-ZIRCONATE-TITANATE CERAMICS [J].
LI, JF ;
DAI, XH ;
CHOW, A ;
VIEHLAND, D .
JOURNAL OF MATERIALS RESEARCH, 1995, 10 (04) :926-938
[10]   VIBRATIONAL MODES IN (PB,LA)(ZR,TI)O3 CERAMICS [J].
LURIO, A ;
BURNS, G .
JOURNAL OF APPLIED PHYSICS, 1974, 45 (05) :1986-1992