Electron microprobe analysis was used to determine interdiffusion coefficients for monocrystalline solid solutions which contained up to 75ppm of total cation impurities (table 162). It was found that the compositional dependence of the coefficients passed through a maximum that shifted to higher CaF2 concentrations at higher temperatures. Extrapolation of the interdiffusion coefficients to the extremes of composition furnished impurity diffusion coefficients that agreed well with tracer results.

Interdiffusion in the System CaF2-SrF2. R.Scheidecker, M.F.Berard: Journal of the American Ceramic Society, 1973, 56[4], 204-6

Table 163

Arrhenius Parameters for the CaF2-YF3

System at 1200 to 1331C