Vibrational Spectroscopy of Ca2LnTaO6 (Ln = lanthanides, Y, and In) and Ca2InNbO6 Double Perovskites

被引：45

作者：

Dias, Anderson ^{[1
]}

Lage, Marcio M. ^{[2
]}

Khalam, L. Abdul ^{[3
]}

Sebastian, Mailadil T. ^{[3
]}

Moreira, Roberto L. ^{[4
]}

机构：

[1] Univ Fed Ouro Preto, Dept Quim, BR-35400000 Ouro Preto, MG, Brazil

[2] Univ Fed Itajuba UNIFEI, Lab Interdisciplinar Mat Avancados, BR-35900373 Itabira, MG, Brazil

[3] Natl Inst Interdisciplinary Sci & Technol, Mat & Minerals Div, Trivandrum 695019, Kerala, India

[4] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil

来源：

CHEMISTRY OF MATERIALS | 2011年 / 23卷 / 01期

关键词：

MICROWAVE DIELECTRIC-PROPERTIES; INFRARED-SPECTROSCOPY; CRYSTAL-STRUCTURE; IONIC PARAMETERS; SOLID-SOLUTIONS; PHONON MODES; CERAMICS; B'; NONSTOICHIOMETRY; SUBSTITUTION;

D O I：

10.1021/cm1027964

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ca(2)LnTaO(6) (Ln = lanthanides, Y, and In) and Ca2InNbO6 ceramics were prepared by the solid-state route, and their vibrational properties were investigated using Raman scattering and infrared spectroscopy. The correct crystal structure and phonon mode features for this lanthanide series in Ca-based double perovskites were determined using experimental data besides group-theoretical models. It was observed that the ceramics with Y, Er, and In exhibit orthorhombic, Pbnm (D-2h(16)) structures, similarly to those previously observed in Ca(2)LnNbO(6) ceramics, whereas the materials with La, Nd, Sm, Eu, Gd, Tb, and Ho show a monoclinic P2(1)/n (C-2h(5)) structure, like Sr(2)LnTaO(6) ceramics. Together with another two previous publications (Dias, A.; Khalam, L. A.; Sebastian, M. T.; Paschoal, C. W. A.; Moreira, R. L. Chem. Mater. 2006, 18, 214-220 and Dias, A.; Khalam, L. A.; Sebastian, M. T.; Lage, M. M.; Matinaga, F. M.; Moreira, R. L. Chem. Mater. 2008, 20, 5253-5259), the present results conclude the study for the A(2)LnTaO(6) materials with alkaline-earth metals in the A-site, showing the changing in the crystalline structure as a function of the chemical environment.

引用

页码：14 / 20

页数：7

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