Temperature and pressure dependence of electrical conductivity in synthetic anorthite

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	Temperature and pressure dependence of electrical conductivity in synthetic anorthite
	Lidong Dai; Heping Li; Keshi Hui; Jia Li; Haiying Hu
刊名	Solid State Ionics
	2015
卷号	276 期号:1 页码:136-141
关键词	Anorthite Electrical Conductivity Transport Mechanism Diffusivity
英文摘要	Electrical conductivity measurements of synthetic anorthite were carried out as a function of pressure and temperature by a Solartron-1260 Impedance/Gain phase analyzer in a multi-anvil apparatus. The impedance spectroscopy was performed in a frequency range from 10-1 Hz to 106 Hz. The sample was synthesized at 1673 K in a high temperature furnace. Our experimental results show that (1) a dramatic increase in electrical conductivity with increasing temperature and a slightly decrease in conductivity with increasing pressure at constant temperature, however, the effect of pressure on the conductivity is less pronounced than that of temperature; (2) the activation enthalpy linearly increases with increasing pressure (1.86-1.91 eV) reflecting the mobility of Ca2(+) decreases as the anorthite framework becomes more compressed; (3) the activation energy at atmospheric pressure and activation volume are 1.83 eV and 2.39 cm(3)/mol, respectively; (4) According to these Arrhenius parameters, it is proposed that the possible dominant mechanism of the charge transport in anorthite under experimental conditions is the hopping of Ca2(+) from one near aluminum oxygen site to another; (4) the diffusion coefficient of calcium was calculated from the present conductivity data using Nernst-Einstein equation, and compared with previous experimental results.
学科主题	地球深部物质与流体作用地球化学
语种	英语
公开日期	2017-05-17
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6034]
专题	地球化学研究所_地球内部物质高温高压实验室_地球内部物质高温高压实验室_期刊论文
推荐引用方式 GB/T 7714	Lidong Dai,Heping Li,Keshi Hui,et al. Temperature and pressure dependence of electrical conductivity in synthetic anorthite[J]. Solid State Ionics,2015,276(1):136-141.
APA	Lidong Dai,Heping Li,Keshi Hui,Jia Li,&Haiying Hu.(2015).Temperature and pressure dependence of electrical conductivity in synthetic anorthite.Solid State Ionics,276(1),136-141.
MLA	Lidong Dai,et al."Temperature and pressure dependence of electrical conductivity in synthetic anorthite".Solid State Ionics 276.1(2015):136-141.