Vibrational studies of A(B′2/3B′1/3)O3 perovskites (A = Ba, Sr; B′ = Y, Sm, Dy, Gd, In; B′′ = Mo, W)

被引：17

作者：

Maczka, M

Hanuza, J

Fuentes, AF

Morioka, Y

机构：

[1] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw 2, Poland

[2] Wroclaw Univ Econ, Fac Ind & Econ, Dept Bioorgan Chem, PL-53345 Wroclaw, Poland

[3] IPN, CINVESTAV, Unidad Saltillo, Saltillo 25000, Coahuila, Mexico

[4] Saitama Univ, Fac Sci, Dept Chem, Urawa, Saitama 3388570, Japan

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2004年 / 16卷 / 13期

关键词：

D O I：

10.1088/0953-8984/16/13/010

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The Raman- and IR-active phonons were studied in ordered Ba(y(2/3)Mo(1/3))O-3, Ba(Y2/3W1/3)O-3, Ba(Gd2/3W1/3)O-3, Ba(Sm-2/3 W-1/3)O-3, Ba(Dy2/3W1/3)O-3, Ba(DY2/3Mo1/3)O-3 and Ba(In2/3W1/3)O-3 as well as disordered Ba(ln(2/3)Mo(1/3)) O-3 and Sr(In2/3W1/3)O-3. The assignment of the observed modes was given on the basis of lattice dynamical calculations. The studies performed revealed the presence of forbidden by the selection rules Raman bands for the Ba(In2/3Mo1/3)O-3 sample. This result suggests that the Ba(In2/3Mo1/3)O-3 contains 1: 1 ordered domains of Fm (3) over barm symmetry embedded in the disordered Pm (3) over barm matrix and that Ba(In2/3Mo1/3)O-3 and Ba(In2/3W1/3)O-3 may be obtained in both ordered and disordered structures, depending on the thermal treatment. This behaviour resembles that of well known Pb(In1/2Nb1/2)O-3, Pb(Sc1/2Nb1/2)O-3 and Pb(Sc1/2Ta1/2)O-3 relaxors.

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页码：2297 / 2310

页数：14

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