摘要
A variety of hematite microstructures are synthesized through oxalic acid-assisted thermal treatment of iron films sputtered onto glass substrates.Petal-likeα-Fe_(2)O_(3)nanoslices and honeycomb-likeα-Fe_(2)O_(3)particles of micrometer sizes are obtained after annealing at 500℃but with different rates of heating to the final annealing temperature.Structures and morphologies of the samples are studied by means of x-ray diffraction,scanningelectron microscopy and atomic force microscopy.These structures are believed to be formed during the period of increasing temperature to the final annealing temperature.Superconducting-quantum-interference-device magnetometer measurements show room-temperature ferromagnetism in these samples.
作者
LI Zi-Yue
ZHANG Hui-Min
LIU Li-Hu
SUN Hui-Yuan
李子岳;张惠敏;刘力虎;孙会元(College of Physics Science and Information Engineering,Hebei Normal University,Shijiazhuang 050024;Key Laboratory of Advanced Films of Hebei Province,Hebei Normal University,Shijiazhuang 050024)
基金
Supported by the Natural Science Foundation of Hebei Province Grant No A2009000254
the Ph.D.Fund of Hebei Normal University Grant Nos L2010B06 and L2009Y03.
