Self-diffusion in solid lithium

Diffusion of hydrogen in (Mg,Fe)2SiO4 and high pressure polymorphs refined by the cBΩ model

“…The validity of the cBX model has been checked for different defect processes (i.e., formation, migration and activation processes) in various categories of solids including metals Alexopoulos, 1977, 1980;Varotsos et al, 1978a;Alexopoulos and Varotsos, 1981), rare gas solids Alexopoulos, 1984, 1986), alkali and silver halides (Varotsos and Alexopoulos, 1986;Varotsos, 2007a;Dologlou, 2010aDologlou, , 2010b, fluorides (Varotsos and Alexopoulos, 1986;Varotsos, 1976Varotsos, , 2007bVarotsos, , 2008 as well as diamond (Varotsos, 2007c;Zhang and Wu, 2012). In addition, the elastic model may provide a basis for the understanding of the compensation rules in carbon subgroup crystals and diffusivity-density scaling function for viscous liquids .…”

“…(4) from a known data point (T 1 , D 1 ). Most previous studies selected this point from a single experimental measurement (e.g., Alexopoulos, 1980, 1986;Varotsos, 2007a;Dologlou, 2010aDologlou, , 2010b. Recently, an alternative straightforward route toward the value of c act is presented through the compensation law (Zhang Fig.…”

Prediction of self-diffusion and heterodiffusion coefficients in zircon

“…(2) Uncertainties arising in the calculation of the elastic and expansivity data of minerals. Fortunately, all of previous studies Alexopoulos, 1980, 1986;Varotsos, 2007aVarotsos, , 2009Dologlou, 2010aDologlou, , 2010bZhang et al, 2010) have indicated that the c act -value has an uncertainty of not more than 3% mainly due to the experimental error in the determination of the elastic and expansivity data of solids. Therefore, to a first approximation, c act can be reasonably considered to a constant which is independent of the temperature and pressure.…”

“…If we still persist in calculating the value of c act for Pb diffusion in zircon from the diffusion compensation trend (Zhao and Zheng, 2007) just like the cases of self-diffusion of O and Si, undoubtedly, it may lead to increasing the disparities between the experimental data and our empirical calculations. Consequently, an alternative approach was employed here to calculate the value of c act from a single experimental measurement Alexopoulos, 1980, 1986;Varotsos, 2007a;Dologlou, 2010aDologlou, , 2010b. We select the experimental results of (Cherniak and Watson, 2001) as a reference data in our calculation to test the validity of the alternative approach.…”

Calculation of self-diffusion coefficients in diamond

“…Note that the validity of the cBX model has been checked not only for various categories of solids (i.e., metals, [13][14][15]17,18 rare gas solids, 12,16 lithium hydride, 19 halides, 12,13 fluorides, 12,13,20,21 diamond, 22 and carbon subgroup crystals 23 ), but also for viscous liquids 24 and rock-forming minerals. [25][26][27] Considering g act is proportional to the quantity BX, by inserting Eq.…”