Disorder-order phase transition induced by size effect in bulk La2/3Sr1/3MnO3

IMR OpenIR

	Disorder-order phase transition induced by size effect in bulk La2/3Sr1/3MnO3
	B. Z. Sun; L. L. He; C. B. Zhang; F. Luo; C. H. Yan
	2006
发表期刊	Solid State Communications
ISSN	0038-1098
卷号	137 期号:9 页码:478-482
摘要	Bulk La2/3Sr1/3MnO3 ceramic samples prepared by thermal decomposition are investigated using transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). An abnormal phenomenon, where three kinds of La2/3Sr1/3MnO3 phases with different structures and the same composition coexist in the same grain, has been observed. Besides the stable rhombohedral majority phase, the two other phases are a simple cubic structure with a = 0.389 nm and a new hexagonal structure with a = 0.544 nm, c = 0.668 nm. The simple cubic phase is a residual phase of high-temperature due to the size effect and bondage of twin boundary. Image simulations have suggested that the new hexagonal phase is the La-Sr ordered structure with space group P3m1, which is converted from the disordered simple cubic phase. The formation mechanism of the ordered phase is explained from volume energy and interface energy considerations. (c) 2006 Elsevier Ltd. All rights reserved.
部门归属	northeastern univ, coll sci, shenyang 110004, liaoning, peoples r china. chinese acad sci, met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china. peking univ, pku,state key lab rare earth mat chem & applicat, hku,coll chem & mol engn, joint lab rare earth mat & bioorgan chem, beijing 100871, peoples r china.;sun, bz (reprint author), northeastern univ, coll sci, shenyang 110004, liaoning, peoples r china;sunbenzhe@hotmail.com
关键词	La2/3sr1/3mno3 Ceramic Transmission Electron Microscopy (Tem) Simple Cubic Phase Image Simulation La-sr Ordered Structure Space Group P3(-)M1 Double-exchange Giant Magnetoresistance Transport-properties Doped Lamno3 La1-xsrxmno3 Microstructure Perovskites Diagram Films
URL	查看原文
WOS记录号	WOS:000236087900004
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34467
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	B. Z. Sun,L. L. He,C. B. Zhang,et al. Disorder-order phase transition induced by size effect in bulk La2/3Sr1/3MnO3[J]. Solid State Communications,2006,137(9):478-482.
APA	B. Z. Sun,L. L. He,C. B. Zhang,F. Luo,&C. H. Yan.(2006).Disorder-order phase transition induced by size effect in bulk La2/3Sr1/3MnO3.Solid State Communications,137(9),478-482.
MLA	B. Z. Sun,et al."Disorder-order phase transition induced by size effect in bulk La2/3Sr1/3MnO3".Solid State Communications 137.9(2006):478-482.