Ferroelastic twins in LaAlO3 polycrystals

被引：39

作者：

Kim, CH

Jang, JW

Cho, SY

Kim, IT

Hong, KS ^{[1
]}

机构：

[1] Seoul Natl Univ, Coll Engn, Sch Mat Sci & Engn, Seoul 151742, South Korea

[2] Korea Inst Sci & Technol, Appl Phys Grp, Seoul 130650, South Korea

[3] Korea Inst Sci & Technol, Div Ceram, Seoul 130650, South Korea

来源：

PHYSICA B | 1999年 / 262卷 / 3-4期

关键词：

LaAlO3; ferroelastic twin; transmission electron microscopy;

D O I：

10.1016/S0921-4526(98)00848-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Characteristics of twins in LaAlO3 (LAO) polycrystals were investigated using transmission electron microscopy. A simple wedge-shaped twin structure was observed and this was attributed to no volume change during the cubic to rhombohedral phase transition. In LAO polycrystals (1 0 0) twin rather than (1 1 0) twin was predominant as in LAO single crystals. To determine the origin of predominance of (1 0 0) twin, strain tensors for the two twin geometries were calculated with the aid of phenomenological crystallographic theory. As a result, it was found that (1 0 0) twin had smaller strain after the transition than did (1 1 0) twin, This result theoretically confirms that (1 0 0) twin is energetically more favorable than(1 1 0) twin, (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：438 / 443

页数：6

共 15 条

[1] POSSIBLE SPECIES OF FERROELASTIC CRYSTALS AND OF SIMULTANEOUSLY FERROELECTRIC AND FERROELASTIC CRYSTALS [J].