Formation of ε-Fe2O3 phase by the heat treatment of α-Fe2O3/SiO2 nanocomposite

被引：46

作者：

Tadic, Marin ^{[1
]}

Spasojevic, Vojislav ^{[1
]}

Kusigerski, Vladan ^{[1
]}

Markovic, Dragana ^{[1
]}

Remskar, Maja ^{[2
]}

机构：

[1] Vinca Inst, Condensed Matter Phys Lab, Belgrade 11001, Serbia

[2] Jozef Stefan Inst, Ljubljana 1000, Slovenia

来源：

SCRIPTA MATERIALIA | 2008年 / 58卷 / 08期

关键词：

nanocrystalline materials; phase transformations; High-resolution electron microscopy (HRTEM); magnetic properties;

D O I：

10.1016/j.scriptamat.2007.12.009

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Starting from a nanocomposite consisting of 4 nm hematite nanoparticles embedded in a silica matrix (30 wt.% hematite) and by applying heat treatments at increasing temperatures up to 1050 degrees C, gradual formation of epsilon-Fe2O3 phase was obtained. Besides representing a new synthesis route of epsilon-Fe2O3 phase, the results obtained in this work indicate that under certain conditions hematite nanoparticles are not thermally stable. Hence, like other ferric oxide polymorphs, nanosized hematite can undergo thermally triggered, size-induced structural phase transitions. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：703 / 706

页数：4

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