Structural transformation in (Ta2O5)1-x(TiO2)x ceramics

被引：12
作者：
Dobal, PS
Katiyar, RS [1 ]
Jiang, Y
Guo, R
Bhalla, AS
机构：
[1] Univ Puerto Rico, Dept Phys, San Juan, PR 00931 USA
[2] Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2000年 / 61卷 / 11期
关键词：
ceramics; Raman spectroscopy; phase transitions;
D O I：
10.1016/S0022-3697(00)00058-5
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Bulk (Ta2O5)(1-x)(TiO2)(x) ceramics for x = 0.05, 0.08, and 0.11 were prepared by the conventional solid state reaction technique and the temperature dependent Raman scattering in the range 70-1173 K was used to study the structural transformations in them. The lowest frequency phonon modes, at about 35-38 cm(-1), in these ceramics were assigned as Ta-Ti vibrations originating from the. interaction between TiO6 octahedra and TaOn5-2n or Ta6O12+6 clusters. Raman spectra exhibited a softening of this mode with increasing temperature, followed by a structural transformation. A structural transition from triclinic to monoclinic phase was observed in the ceramics at about 360, 450, and 540 degrees C for compositions x = 0.05, 0.08, and 0.11, respectively. (C) 2000 Elsevier Science Ltd. All rights reserved.
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页码：1805 / 1808
页数：4
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