%0 Journal Article
%T Hydrothermal synthesis of iron pyrite (FeS22) crystalpowder and the rmal-kinetic study on crystal growth<br>水热法合成FeS2粉晶及其生长热动力学的研究
%A Duan He
%A Zheng Yu-Feng
%A Zhang Xiao-Gang
%A Sun Yan-Fei
%A Dong You-Zhong
%A <br>段 鹤
%A 郑毓峰
%A 张校刚
%A 孙言飞
%A 董有忠
%J 物理学报
%D 2005
%I 
%X Single-phase iron pyrite (FeS 2 ) crystalpowder was prepared by sol-gel hydrothermal method, which was characterized via x-ray diffraction, Fourier transform infrared and scanning electron microscope. A simplified mathematic model was established to analyze the crystal growth process. Results indicate that phase transformation and diffusion mechanism control the process, which fits the second-order kinetic equation with an exponent 3.215 for time t. This is a decelerated process that can be divided into three steps: during the first period, marcasite and pyrite phases are produced, and then with inducting of sulfur into the reaction, the process is dominated by the merging of marcasite into pyrite. Ultimately, with the fuse of small grains and the growing of larger ones, single-phase iron pyrite crystals grow up through diffusion mechanism.
%K sol_gel hydrothermal method
%K iron pyrite crystalpowder
%K crystal gro wth
%K thermal_kinetics<br>溶胶_凝胶水热法，
%K FeS22粉晶，
%K 晶粒生长，
%K 热动力学
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=700E7BCA4329AD2C&yid=2DD7160C83D0ACED&vid=318E4CC20AED4940&iid=E158A972A605785F&sid=C690871E0010130A&eid=27B74BA4EDC40A8D&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=14