水热法合成负热膨胀材料ZrW_2O_8  

HYDROTHERMAL SYNTHESIS OF NEGATIVE THERMAL EXPANSION MATERIAL ZrW_2O_8

作　　者：邢奇凤[1] 邢献然[1] 杜凌[2] 于然波[1] 陈骏[1] 邓金侠[1] 罗君[1] 

机构地区：[1]北京科技大学物理化学系,北京100083 [2]北京科技大学化学系,北京100083

出　　处：《金属学报》2005年第6期669-672,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金20331030和20171006资助项目

摘　　要：采用水热法在500℃的低温条件下成功地合成了具有负热膨胀系数的材料ZrW2O8.X射线衍射结果表明,当加入的盐酸溶液浓度CHCl≥6mol/L时,可用水热法合成出多晶前驱体ZrW2O7(OH)2(H2O)2.运用热重-差热分析法研究了前驱体ZrW2O7(OH)2(H2O)2和产物ZrW2O8的热稳定性.结果表明,前驱体在较低温度(500℃)下灼烧即可获得产物ZrW2O8.经X射线衍射和红外光谱分析证明,所获得的产物为单一立方相ZrW2O8.Negative thermal expansion compound ZrW2O8 was successfully synthesized by hydrothermal method with low temperature heat treatment at 500 degrees C. The XRD result showed that the crystalline precursor ZrW2O7(OH)(2)(H2O)(2) was formed when the concentration of HCl was equal to or greater than 6 mol/L. The thermal stability of the synthesized ZrW2O8 and its precursor ZrW2O7(OH)(2)(H2O)(2) were studied by thermo-gravimetric analysis (TGA) and differential thermal analysis (DTA), which confirmed ZrW2O8 could be synthesized through sintering the precursor at low temperature of 500 degrees C. Powder X-ray diffraction and FT-IR spectroscopy investigations confirmed that the synthesized product is single cubic ZrW2O8 phase.

关 键 词：ZRW2O8 水热合成 负热膨胀 

分 类 号：TQ174[化学工程—陶瓷工业] O614[化学工程—硅酸盐工业]