Optical-active phonons in A3Fe2B′O9 (A=Ca, Sr; B′=Te, W) double perovskites

被引：11
作者：
Silva, E. N. [1 ]
Guedes, I. [2 ]
Ayala, A. P. [2 ]
Lopez, C. A. [3 ]
Augsburger, M. S. [3 ]
Viola, M. del C. [3 ]
Pedregosa, J. C. [3 ]
机构：
[1] Univ Fed Maranhao, Dept Fis, BR-65085580 Sao Luis, MA, Brazil
[2] Univ Fed Ceara, Dept Fis, BR-60475970 Fortaleza, Ceara, Brazil
[3] Univ Nacl San Luis, Fac Quim Bioquim & Farm, Dept Quim, Area Quim Gen & Inorgan Dr GF Puelles, San Luis, Argentina
来源：
JOURNAL OF APPLIED PHYSICS | 2010年 / 107卷 / 04期
关键词：
calcium compounds; crystal structure; infrared spectra; iron compounds; phonons; Raman spectra; space groups; strontium compounds; NEUTRON POWDER DIFFRACTION; RAMAN-SCATTERING; SPECTROSCOPY; SR3FE2TEO9; EVOLUTION; CRYSTAL;
D O I：
10.1063/1.3309259
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Raman scattering and infrared transmittance techniques are used to investigate the phonons of the Sr3Fe2TeO9 (SFTO), Sr3Fe2WO9 (SFWO), and Ca3Fe2WO9 (CFWO) double perovskites at 300 K. While SFTO and SFWO crystallize in a tetragonal structure belonging to the I4/m space with two formulas per unit cell (Z=2), CFWO crystallizes in a monoclinic structure belonging to the space group P2(1)/n with Z=2. The observed spectra are very similar to that of the prototype cubic (Fm3m) double perovskite, indicating that both the tetragonal and monoclinic structures result from small distortions of the cubic cell. The assignment of the optical phonons follows that given for the prototype Fm3m double perovskites.
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页数：5
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