Hydrothermal Synthesis and Thermal Stability of Natural Mineral Lindgrenite  

作　　者：BAO Ren-lie KONG Zu-ping GU Min YUE Bin WENG Lin-hong HE He-yong 

机构地区：[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

出　　处：《Chemical Research in Chinese Universities》2006年第6期679-683,共5页高等学校化学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No. 20371013, 20421303),;National Key Basic ResearchProgram of China(No. 2003CB615807) ;the State Key Laboratory Base of Novel Functional Materials and Preparation Science(Ningbo University).

摘　　要：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.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.

关 键 词：Hydrothermal synthesis Lindgrenite Structural refinement Composite metal oxide Thermal stability 

分 类 号：P578[天文地球—矿物学]