The effect of point defects on ferroelastic phase transition of lanthanum-doped calcium titanate ceramics

被引：6

作者：

Ni, Yan ^{[1
]}

Zhang, Zhen ^{[1
]}

Wang, Dong ^{[1
]}

Wang, Yu ^{[2
]}

Ren, Xiaobing ^{[1
,3
]}

机构：

[1] Xi An Jiao Tong Univ, Multidisciplinary Mat Res Ctr, Frontier Inst Sci & Technol, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[2] Xi An Jiao Tong Univ, MOE Key Lab Nonequilibrium Synth & Modulat Conden, Xian 710049, Peoples R China

[3] Natl Inst Mat Sci, Ferro Phys Grp, Tsukuba, Ibaraki 3050047, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 577卷

基金：

中国国家自然科学基金;

关键词：

Ferroelastic phase transition; Point defects; Calcium titanate; CATIO3; PEROVSKITE; STRAIN GLASS; SPACE GROUP; SYSTEM; TEMPERATURES; DIFFRACTION; DIAGRAM;

D O I：

10.1016/j.jallcom.2012.02.021

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：

In the present paper, La-doped CaTiO3 is studied to investigate the effect of point defects on ferroelastic phase transition of the ceramics. The dynamic mechanical measurements show that the transition temperature of the orthorhombic to tetragonal phase transition of Ca(1-x)La2x/3TiO3 decreases with increasing dopant (La) concentration x. The samples with the dopant content of x= 0.45 and 0.7 exhibit different structure evolution features during their transition processes as revealed by in situ powder X-ray diffraction (XRD) measurement. Moreover, when x = 0.7, the storage modulus shows a frequency-dependent minimum at T-g, which can be well fitted with the Vogel-Fulcher relation, and the corresponding internal friction also exhibits a frequency-dependent peak within the same temperature regime. These results thus indicate that doping La suppresses ferroelastic phase transition in CaTiO3 and induces a "glassy-like" behavior in Ca(1-x)La2x/3TiO3, which is similar to "strain glass" in Ni-doped Ti50-xNi50+x. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：S468 / S471

页数：4