论文库--中国科学院地球化学研究所

论文题目:	Application of the cB Omega model to the calculation of diffusion parameters of Si in silicates
全部作者:	ZHANG Baohua, SHAN Shuangming
第一作者:	ZHANG Baohua
联系作者:	SHAN Shuangming
刊物名称:	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
发表年度:	2015
卷:	16
期:	3
页码:	705-718
摘要:	Silicon diffusion in major mantle minerals plays an important role in understanding a number of physical and chemical processes in the Earth's interior. Inspection of existing experimental data reveals linear compensation law between the preexponential factors and the activation energies for Si diffusion in various minerals by focusing on those of geophysical interest. On the basis of the observed compensation relationship, here we propose a thermodynamic model, the so-called cB model that interconnects point defect parameters with the bulk properties to reproduce the Si self-diffusion coefficients in different rock-forming minerals. When the uncertainties are considered, the predicted results show that the temperature and pressure dependences of self-diffusion coefficients concur with existing experimental data and theoretical calculations in most cases.
论文链接:	http://onlinelibrary.wiley.com/doi/10.1002/2014GC005551/abstract