不同粒径纳米晶硫化锌的高压结构相变研究  

Synchrotron Radiation of Different Nano Size ZnS Nanocrystalline under High Pressure Induced

作　　者：潘跃武[1] 于杰[1] 崔启良[2] 高春晓[2] 邹广田[2] 刘景[3] 

机构地区：[1]哈尔滨工业大学深圳研究生院材料科学与工程学科部,广东深圳518055 [2]吉林大学超硬材料国家重点实验室,吉林长春130012 [3]中国科学院高能物理研究所同步辐射实验室,北京100039

出　　处：《高压物理学报》2007年第1期29-34,共6页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金重点项目(10299040)

摘　　要：应用原位能量色散X射线散射和金刚石对顶砧技术,对纳米晶ZnS进行了高压结构相变研究。初始相为纤锌矿结构的10 nm和3 nm硫化锌分别在16.0 GPa和16.7 GPa时转变为岩盐矿结构,相变压力均高于纤锌矿结构的体材料硫化锌。该相变为一可逆的结构相变。应用大型科学计算软件Materials Studio(MS)计算了纳米晶ZnS的状态方程,根据Birch-Murnaghan方程拟合了纳米晶ZnS的零压体模量,得到的零压体模量高于相应体材料的零压体模量,表明纳米晶ZnS较难压缩。In-situ energy dispersive X-ray diffraction（EDXD） on ZnS nanocrystalline was carried out under high pressure by using a diamond anvil cell（DAC）. Phase transition of nano ZnS from wurtzite to rocksalt occurred at 16.0 GPa and 16.7 GPa for 10 nm and 3 nm sample,respectively,which were higher than that of the bulk materials. The structures of ZnS nanocrystalline at different pressures are built by using Materials Studio（MS） and the bulk modulus and the pressure derivative of ZnS nanocrystalline were derived by fitting the equation of Birch-Murnaghan. The resulting modulus was higher than that of the corresponding bulk material,indicating that nanomaterial possesses higher hardness than its hulk materials.

关 键 词：同步辐射 纳米晶硫化锌 高压 结构相变 

分 类 号：O521.2[理学—高压高温物理]