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Chemical Research in Chinese Universities ›› 2006, Vol. 22 ›› Issue (6): 679-683.doi:

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Hydrothermal Synthesis and Thermal Stability of Natural Mineral Lindgrenite

BAO Ren-lie1, KONG Zu-ping1,2, GU Min1, YUE Bin1, WENG Lin-hong1 and HE He-yong1
   

    1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China;
    2. School of Scientific Materials and Chemical Engineering, Ningbo University, Ningbo 315211, P. R. China
  • Received:2006-02-22 Revised:1900-01-01 Online:2006-11-25 Published:2006-11-25
  • Contact: YUE Bin E-mail:yuebin@fudan.edu.cn

Cited

11

Abstract: A natural mineral, lindgrenite Cu3(MoO4)2(OH)2, was synthesized from a mixture of sodium molybdate, copper sulfate, and morpholine in water under autogenous pressure at 170 ℃. The crystal structure of the mineral was determined and the final refinement for 791 observed reflections with I>2σ(I) gave R1=0.0205 and wR2=0.0496. The thermal stability of the mineral was investigated by using TG-DTA and variable-temperature in situ X-ray diffraction(XRD) techniques. The crystalline Cu3Mo2O9 was obtained when the mineral underwent thermal dehydration at a temperature ranging from 300 to 400 ℃, and the mixture of MoO3 and CuO was formed through decomposition of Cu3Mo2O9 at a temperature ranging from 650 to 700 ℃. Therefore, the structure of the mineral was thermally unstable at above 300 ℃, suggesting that Lindgrenite was likely formed via the hydrothermal route
occurring in the nature.

Key words: Hydrothermal synthesis, Lindgrenite, Structural refinement, Composite metal oxide, Thermal stability, Hydrothermal synthesis, Lindgrenite, Structural refinement, Composite metal oxide, Thermal stability