Raman spectra and extended X-ray absorption fine structure characterization of La(2-x)/3NaxTiO3 and Nd(2-x)/3LixTiO3 microwave ceramics

被引：12

作者：

Chen, Mei-Yu ^{[1
]}

Chiu, Ching Yu ^{[1
]}

Chia, Chia-Ta ^{[1
]}

Lee, J. F. ^{[2
]}

Bian, J. J. ^{[3
]}

机构：

[1] Natl Taiwan Normal Univ, Dept Phys, Taipei 116, Taiwan

[2] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

[3] Shanghai Univ, Dept Inorgan Mat, Shanghai 200072, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2010年 / 30卷 / 02期

关键词：

Dielectric properties; X-ray methods; Spectroscopy; Optical properties; LITHIUM ION CONDUCTIVITY; PHASE-TRANSITION; DIFFRACTION; PEROVSKITES; LN;

D O I：

10.1016/j.jeurceramsoc.2009.07.024

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A-site deficient perovskite compounds, La(2-x)/3NaxTiO3 (0.02 <= x <= 0.5) and Nd(2-x)/3LixTiO3 (0.1 <= x <= 0.5) microwave ceramics, were investigated by Raman scattering. Nd(2-x)/3LixTiO3 (0.1 <= x <= 0.5) was also investigated by extended X-ray absorption fine structure (EXAFS) measurement. The Raman shifts of the E (239 cm(-1)) and A(1) (322 cm(-1)) modes of La(2-x)/3NaxTiO3 were found to decrease with x. However, the E (254 cm(-1)) and A(1) (338 cm(-1)) of Nd(2-x)/3LixTiO3 were found to blueshift with x, which was caused by Li substitution. The redshift of the A(1) (471 cm(-1)) phonon of Nd(2-x)/3LixTiO3 (0.1 <= x <= 0.3) indicates that O-Ti-O bonding forces lessen with Li concentration, which is consistent with the EXAFS result that Ti-O bond lengths increase for 0.1 <= x <= 0.3. For x > 0.3, the EXAFS result shows that Ti-O bond lengths decrease. Moreover, Ti-O bond lengths show strong correlation with the microwave dielectric constants of Nd(2-x)/3LixTiO3. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：335 / 339

页数：5

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