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摘要

采用高压在位交流阻抗谱技术, 研究了ZnS纳米晶在0—29.8 GPa压力范围内的晶粒和晶界性质变化及相关相变机理. 从晶粒和晶界的模谱图像中观察到, 随着压力的增加, 象征晶界影响的圆弧逐渐增加, 而代表晶粒作用的圆弧逐渐减弱. 此外, 晶粒电阻和晶界电阻随压力的升高呈现不同的变化速率, 并在11和15 GPa处出现了不连续变化点, 分别对应着由纤锌矿到闪锌矿到岩盐相结构转变的压力点. 进一步通过分析相变过程中晶界弛豫频率随压力的线性变化关系, 研究了ZnS由纤锌矿到闪锌矿到岩盐相的相变机理.

关键词:

高压/
ZnS/
阻抗谱/
相变

Abstract

In this paper, the grain and grain boundary characteristics and mechanisms of phase transition (from wurtzite to zinc-blende to rock-salt phase structure) of ZnS nanocrystallines are investigated via in situimpedance measurement under pressure up to 29.8 GPa. It should be noted that there are two semiarcs can be found from the modulus plots of ZnS under different pressures. The semiarc in high frequency region represents the grain characteristic, and another one in low frequency region refers to the grain boundary characteristic. The former decreases gradually with pressure increasing and the latter shows an opposite trend. This fact indicates that the effect of grain characteristic becomes weaker and weaker, and the role of grain boundary characteristic is just on the contrary. The grain resistance and grain boundary resistance of ZnS nanocrystalline are also studied. In the low pressure region, both resistances increase with different increment rate with pressure increasing, which can be attributed to the enhanced ability of trap charge carriers due to the small size effect of nanoparticles. In addition, two discontinuous points (about 11 and 15 GPa) can be observed in both resistance curves, corresponding to the points of phase transition from wurtzite to zinc-blende to rock-salt phase structure. With pressure increasing, both resistances decrease gradually until 21 GPa, and this point corresponds to the end of transition from zinc-blende to rock-salt phase structure. Their consequent variations are different, grain boundary resistance gradually decreases with the pressure increasing, while the grain resistance is almost a constant. Additionally, the relaxation frequency, as an intrinsic characteristic, is not affected by the geometrical parameters. According to the linear relation between the grain boundary relaxation frequency and pressure in the pressure range of phase transformation, the mechanism of structure transition from wurtzite to zinc-blende to rock-salt phase structure is also discussed in detail. Based on the investigations, the in situimpedance spectroscopy can not only be used to accurately measure the grain and grain boundary characteristics, but also provide information for studying the phase transformation under pressure.

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通信作者:王月,wangsuiyue@foxmail.com

基金项目:国家级-国家自然科学基金(11404032)

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Corresponding author:Wang Yue,wangsuiyue@foxmail.com

文章全文: translate this paragraph

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