Pressure induced phase transition of nanocrystalline and bulk maghemite (γ-Fe2O3) to hematite (α-Fe2O3)

被引：25
|
作者：
Zhu, Hongyang [1 ,2 ]
Ma, Yanzhang [1 ]
Yang, Haibin [2 ]
Ji, Cheng [1 ]
Hou, Dongbin [1 ]
Guo, Lingyun [1 ]
机构：
[1] Texas Tech Univ, Dept Mech Engn, Lubbock, TX 79409 USA
[2] Jilin Univ, Natl Lab Superhard Mat, Changchun 130012, Jilin, Peoples R China
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2010年 / 71卷 / 08期
关键词：
High Pressure; X-ray diffraction; X-RAY-DIFFRACTION; STRUCTURAL TRANSITIONS; SIZE DEPENDENCE; TRANSFORMATION; NANOPARTICLES; SPECTROSCOPY; STABILITY; MOSSBAUER;
D O I：
10.1016/j.jpcs.2010.03.031
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Phase transition and bulk moduli of bulk and nanocrystalline gamma-Fe2O3 were studied using synchrotron X-ray diffraction under high pressure. Contrary to most other nanomaterials, nanocrystalline gamma-Fe2O3 begins to transform into alpha-Fe2O3 at the same pressure as bulk gamma-Fe2O3, which is caused by a special structure of gamma-Fe2O3, in which there exist vacancies of crystal. It is believed that phase transition starts from a certain site of vacancy because of the stress concentration at vacancy sites. Compared to bulk material, nanocrystalline gamma-Fe2O3 has a larger bulk modulus, which is ascribed to the large ratio of surface to volume. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1183 / 1186
页数：4
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