Structure evolution in La(Mg0.5Ti0.5)O-3-SrTiO3 system

authors	Avdeev, M; Seabra, MP; Ferreira, VM
nationality	International
journal	MATERIALS RESEARCH BULLETIN
author keywords	ceramics; X-ray diffraction; crystal structure
keywords	MICROWAVE DIELECTRIC-PROPERTIES; TEMPERATURE PHASE-TRANSITIONS; COMPLEX PEROVSKITES; RESONANT-FREQUENCY; TOLERANCE FACTOR; LA(MG1/2TI1/2)O-3; COEFFICIENT; CERAMICS
abstract	Crystal structure transformations of dielectric ceramics in the (1-x)La(Mg0.5Ti0.5)O-3 (LMT)-xSrTiO(3) (ST) [0 < x < 1] system were studied using Rietveld analysis of X-ray powder diffraction data. LMT and ST form a solid solution in all the compositional range. Increase of SrTiO3 content results in the following sequence of structure transformations: P2(1)/n (a(-)a(-)c(+), B-site ordered) --> Pbnm (a(-)a(-)c(+)) --> Imma (a(-)a(-)c(0)), I4/mcm (a(0)a(0)c(-)), which are related to the disappearance of B-site cation ordering (x > 0.1), in-phase tilting (x > 0.5), and transition from anti-phase two-tilting to one-tilting system (x > 0.7), respectively. (C) 2002 Elsevier Science Ltd. All rights reserved.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	0025-5408
year published	2002
volume	37
issue	8
beginning page	1459
ending page	1468
digital object identifier (doi)	10.1016/S0025-5408(02)00809-7
web of science category	Materials Science, Multidisciplinary
subject category	Materials Science
unique article identifier	WOS:000177227200009