Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (04): 419-424.doi: 10.3866/PKU.WHXB20050415

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Effect of pH Value on FeS2 Powder Synthesized by Solvothermal Process

CHEN Yan-Hua; ZHENG Yu-Feng; ZHANG Xiao-Gang; SUN Yan-Fei; DONG You-Zhong   

  1. Department of Physics; College of Chemical Engineering, Xinjiang University, Urumqi 830046
  • Received:2004-09-09 Revised:2004-12-06 Published:2005-04-15
  • Contact: ZHENG Yu-Feng E-mail:zyf2616@163.com

Abstract: Synthesis of the FeS2 (pyrite) powders via a solvent-thermal process is reported. Using FeSO4 and NH2CSNH2 as precursors and polyvinylpyrrolidone (PVP) as a protective agent (dispersant), high purity FeS2 powders have been synthesized by reaction in alcohol-water solution at 200 ℃ for 36 h. The experiment result shows that, single-phase pyrite powders can be obtained both in acid environment (pH=5) and in alkali environment (pH=10). Effects of pH value on pyrite powder structure, crystallite size and optical characterization are discussed.

Key words: FeS2 (pyrite), Solvothermal, pH value, Dispersant