Structure sequence in the CaTiO3-LaAlO3 microwave ceramics -: Revised

被引：39

作者：

Khalyavin, DD ^{[1
]}

Salak, AN

Senos, AMR

Mantas, PQ

Ferreira, VM

机构：

[1] Univ Aveiro, CICECO, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal

[2] Univ Aveiro, CICECO, Dept Civil Engn, P-3810193 Aveiro, Portugal

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2006年 / 89卷 / 05期

关键词：

D O I：

10.1111/j.1551-2916.2006.00929.x

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：

The composition-induced crystal structure transformations in the (1-x)CaTiO3-xLaAlO(3) microwave ceramics were studied by X-ray powder diffraction. Increasing LaAlO3 content results in two-phase transitions: Pnma -> Imma (0.4 < x < 0.5) and Imma -> R (3) over barc (0.5 < x < 0.6), which are related to changes of the octahedral tilting: a(-)b(+)a(-)-> a(-)b(0)a(-) and a(-)b(0)a(-)-> a(-)a(-)a(-), respectively. The compositional variation of the parameters of the primitive perovskite unit cell is consistent with a continuous character of the Pnma -> Imma phase transition. In the case of the Imma -> R (3) over barc crossover, a discontinuity in the variation is observed.

引用

页码：1721 / 1723

页数：3