Size effect and evidence of a size-driven phase transition in Bi4Ti3O12 nanocrystals

被引:49
作者
Du, YL [1 ]
Zhang, MS
Chen, Q
Yuan, ZR
Yin, Z
Zhang, QA
机构
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Ctr Mat Anal, Nanjing 210093, Peoples R China
[3] Anhui Polytech Univ, Sch Met & Mat, Maanshan 243002, Peoples R China
基金
中国国家自然科学基金;
关键词
nanostructures; chemical synthesis; phase transitions; crystal structure and symmetry;
D O I
10.1016/S0038-1098(02)00493-3
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Bi4Ti3O12 nanocrystals (nc-BTO) were prepared by chemical coprecipitation technique. The crystal structure of the nanocrystals covering mean grain sizes from 16 to 48 nm was determined by X-ray diffraction and refined by the Rietveld method. Differential thermal analysis was employed to investigate the temperature dependent phase transition behavior in nc-BTO. With decreasing grain size the tetragonal-orthorhombic phase transition temperature decreases and ferroelectricity weakens. A size-driven phase transition was found at a critical size d(c) = 44 nm for nc-BTO. The high-temperature tetragonal phase stabilizes at room temperature when d < d(c). The origin of the structural anomaly is attributed to higher strain energy induced by lattice strain and to higher inter-phase surface energy difference in nc-BTO system. (C) 2002 Elsevier Science Ltd. All rights, reserved.
引用
收藏
页码:113 / 118
页数:6
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