Electrical conductivity of K-feldspar at high temperature and high pressure

	Electrical conductivity of K-feldspar at high temperature and high pressure
	Haiying Hu; Lidong Dai; Heping Li; Jianjun Jiang; Keshi Hui
	2014
发表期刊	Mineralogy and Petrology
卷号	108 期号:5 页码:609-618
摘要	Electrical conductivity measurements on dry polycrystalline K-feldspar were performed at 1.0 to 3.0 GPa and 873 to 1,173 K with a multi-anvil high-pressure apparatus and the Solartron-1260 Impedance/Gain Phase Analyzer in the frequency range of 10⁻¹ to 10⁶ Hz. At each temperature the complex impedance displays a perfect semi-circular arc that represents the grain-interior conduction. Under the experimental conditions, electrical conductivity exponentially increases with increasing temperature and slightly decreases with increasing pressure; however, the effect of pressure on the conductivity is less pronounced than that of temperature. The activation enthalpy decreases slightly from 0.99 to 1.02 eV with increasing pressure, and the activation energy and activation volume for K-feldspar are 0.98 eV and 1.46 ± 0.17 cm³/mol, respectively. According to these Arrhenius parameters, ionic conduction is proposed to be the dominant conduction mechanism in K-feldspar at high temperatures and pressures, and potassium ions are the charge carriers transporting by an interstitial mechanism. The diffusion coefficient of potassium at high temperatures was calculated from our conductivity data on K-feldspar using Nernst–Einstein equation, and the results were compared with the previous experimental results.
学科领域	地球深部物质与流体作用地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5276
专题	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	Haiying Hu,Lidong Dai,Heping Li,et al. Electrical conductivity of K-feldspar at high temperature and high pressure[J]. Mineralogy and Petrology,2014,108(5):609-618.
APA	Haiying Hu,Lidong Dai,Heping Li,Jianjun Jiang,&Keshi Hui.(2014).Electrical conductivity of K-feldspar at high temperature and high pressure.Mineralogy and Petrology,108(5),609-618.
MLA	Haiying Hu,et al."Electrical conductivity of K-feldspar at high temperature and high pressure".Mineralogy and Petrology 108.5(2014):609-618.

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