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Phase transformation of β-Fe2O3 hollow nanoparticles

Title
Phase transformation of β-Fe2O3 hollow nanoparticles
Author
이재성
Keywords
hollow structure; nanomaterials; beta-Fe2O3; phase transformation; surface
Issue Date
2008-01
Publisher
ELSEVIER SCIENCE BV
Citation
MATERIALS LETTERS, v. 62, No. 4-5, Page. 561-563
Abstract
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.
URI
https://www.sciencedirect.com/science/article/pii/S0167577X07008865https://repository.hanyang.ac.kr/handle/20.500.11754/76669
ISSN
0167-577X
DOI
10.1016/j.matlet.2007.08.073
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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