Vibrational study of A3In2B"O9 (A = Ba, Sr; B" = U, W) double perovskites

被引：11

作者：

Silva, E. N. ^{[1
]}

Ayala, A. P. ^{[2
]}

Guedes, I. ^{[2
]}

Larregola, S. A. ^{[3
]}

Pinacca, R. M. ^{[3
]}

Viola, M. del C. ^{[3
]}

Pedregosa, J. C. ^{[3
]}

机构：

[1] Univ Fed Maranhao, Dept Fis, BR-65000000 Sao Luis, MA, Brazil

[2] Univ Fed Ceara, Dept Fis, BR-60475970 Fortaleza, Ceara, Brazil

[3] Univ Nacl San Luis, Area Quim Gen & Inorgan Dr GF Puelles, Dept Quim, Fac Quim Bioquim & Farm, San Luis, Argentina

来源：

JOURNAL OF RAMAN SPECTROSCOPY | 2009年 / 40卷 / 08期

关键词：

double perovskites; In-U and In-W oxides; FT-IR transmittance; Raman scattering; ORDER-DISORDER; COMPLEX PEROVSKITES; RAMAN-SPECTROSCOPY; CRYSTAL-STRUCTURE; ROOM-TEMPERATURE; SCATTERING; PHASE; GD; MO; SM;

D O I：

10.1002/jrs.2225

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Raman scattering and infrared transmittance techniques were used to investigate the room-temperature phonon spectra of the polycrystalline Ba3In2UO9, Sr3In2UO9, Ba3In2WO9 and Sr3In2WO9 double perovskites. Although X-ray diffraction has shown that both Ba3In2UO9 and Ba3In2WO9 crystallize in a disordered cubic (Pm (3) over barm-O-h(1)) structure with one formula unit per unit cell (Z = 1), Raman measurements revealed that both Ba3In2UO9 and Ba3In2WO9 compounds should exhibit a 1:1 ordered domains with Fm (3) over barm symmetry, embedded in the Pm (3) over barm matrix. Observation of a nu(1)-like vibration of the InO6 octahedron reflects the occurrence of a two-phonon-like behavior due to the intrinsic occupational disorder at octahedral symmetry sites. Assignment of most of the Raman and infrared phonons is also given. Copyright (C) 2009 John Wiley & Sons, Ltd.

引用

页码：1028 / 1032

页数：5

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