利用电导率测量方法研究不同粒径ZnS高压相变过程

Phase transition studies of varied grain size ZnS with electrical conductivity measurement under high pressure

利用在金刚石对顶砧上集成的金属电极,对不同粒径的ZnS材料进行了高压原位电导率测量.粒径为2μm的体材料ZnS在15GPa时,电导率迅速增大5个数量级,表明体材料ZnS此时发生了从闪锌矿到岩盐矿的结构相变.而粒径6nm的纳米材料ZnS的结构相变压力为21GPa.电导率测量结果还表明纳米ZnS比体材料ZnS还具有更宽的迟滞区间.

Electrical conductivity measurement of varied grain size ZnS were investigated under high pressure using integrated metallic electrode on the diamond anvil celI（DAC）. The conductivity of ZnS were found increasing five orders quickly at 15 GPa , which showed structural phase transition from blende to rocksalt for these bulk materials and 2 μm samples. In addition, the structural transition occurred at 21 GPa for nano-materials and 6 nm ZnS sample. The resulting conductivity indicated nano-material ZnS possesses more wide hysteresis range than its bulk materials.