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

页码：1183 / 1186

页数：4

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