期刊
MATERIALS LETTERS
卷 62, 期 4-5, 页码 561-563出版社
ELSEVIER
DOI: 10.1016/j.matlet.2007.08.073
关键词
hollow structure; nanomaterials; beta-Fe2O3; phase transformation; surface
The phase transformation of beta-Fe2O3 with a hollow nanostructure was first investigated by in-situ X-ray diffractometry (XRD) at elevated temperatures. As a starting material, the beta-Fe2O3 hollow nanoparticles (HNP) less than 40 nm in size were prepared by chemical vapor condensation (CVC) process. The XRD analysis revealed that the initial beta-Fe2O3 phase was transformed to gamma-Fe2O3 at 500 degrees C, and no further transformation from gamma-Fe2O3 to alpha-Fe2O3 was observed up to 800 degrees C. The experimental findings indicate that the increase of surface area derived from the hollow structure is responsible for the decrease of the transformation temperature and the stability of the gamma-Fe2O3 phase at high temperatures. (c) 2007 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据