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Hydrothermal synthesis of iron pyrite (FeS22) crystalpowder and the rmal-kinetic study on crystal growth

Zhang Xiao-Gang Duan He Zheng Yu-Feng Sun Yan-Fei Dong You-Zhong

Hydrothermal synthesis of iron pyrite (FeS22) crystalpowder and the rmal-kinetic study on crystal growth

Zhang Xiao-Gang, Duan He, Zheng Yu-Feng, Sun Yan-Fei, Dong You-Zhong
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  • Received Date:  11 May 2004
  • Accepted Date:  02 November 2004
  • Published Online:  19 April 2005

Hydrothermal synthesis of iron pyrite (FeS22) crystalpowder and the rmal-kinetic study on crystal growth

  • 1. (1)新疆大学化学化工学院,乌鲁木齐 830046; (2)新疆大学物理系,乌鲁木齐 830046

Abstract: Single_phase iron pyrite (FeS22) crystalpowder was prepared by so l_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 secon d_order kinetic equation with an exponent 3215 for time t. This is a decel erated process that can be divided into three steps: during the first period, ma rcasite and pyrite phases are produced, and then with inducting of sulfur into t he reaction, the process is dominated by the merging of marcasite into pyrite. U ltimately, with the fuse of small grains and the growing of larger ones, single_ phase iron pyrite crystals grow up through diffusion mechanism.

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