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题名: Probing the Size Effect of Co2FeGa-SiO2@C Nanocomposite Particles Prepared by a Chemical Approach
作者: Yeu-Kuang Hwu
Changhai Wang
Lubna Basit
Yuriy Khalavka
Yanzhi Guo
Frederick Casper
Teuta Gasi
Vadim Ksenofontov
贡献者: 國立臺灣海洋大學:光電科學研究所
日期: 2010-11
上传时间: 2018-07-10T02:12:08Z
出版者: CHEMISTRY OF MATERIALS
摘要: Abstract: In this contribution, we report the chemical synthesis of carbon coated, silica supported Co2FeGa (Co2FeGa-SiO2@C) nanocomposite particles. The particle size of Co2FeGa particles can be tuned by varying the amount of silica supports. The dependences of the crystal structure and magnetic properties on particle size have been investigated by synchrotron radiation based X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) spectroscopy, transmission electron microscope (TEM), 57Fe Mössbauer spectroscopy, and superconducting quantum interference device (SQUID). The superparamagnetic critical size of Co2FeGa Heusler nanoparticles is found to be ∼17 nm by correlating the TEM derived particle size distribution to the Mössbauer spectroscopy data. The effects of silica supports and carbon coating on the formation of Co2FeGa nanoparticles of various sizes are also discussed.
關聯: 22(24) pp.6575–6582
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47282
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