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- W1999770246 abstract "The diffusion coefficient $D={D}^{0}{e}^{ensuremath{-}frac{{Q}^{0}}{mathrm{RT}}}$ and isotope effect for ${mathrm{Kr}}^{78}$ and ${mathrm{Kr}}^{86}$ in solid Ar have been measured using a tracer technique. The activation energy $Q_{mathrm{Kr}}^{}{}_{}{}^{0}$ depends on the interchange parameter $w$, but is estimated to lie in the range 3500-3900 cal ${mathrm{mole}}^{ensuremath{-}1}$, with the most reliable $w$ giving the lower value. Thus, the two calculated $Q_{mathrm{Kr}}^{}{}_{}{}^{0}$ (3853 and 4050 cal ${mathrm{mole}}^{ensuremath{-}1}$) for the vacancy mechanism using a two-body (12, 6) potential appear somewhat high, but in reasonable agreement with experiment. The isotope effect gives $fensuremath{Delta}Kensuremath{equiv}frac{(frac{{D}_{78}}{{D}_{86}}ensuremath{-}1)}{[{(frac{86}{78})}^{frac{1}{2}}ensuremath{-}1]}=0.48ifmmodepmelsetextpmfi{}0.25$ which, since $Q_{mathrm{Kr}}^{}{}_{}{}^{0}Q_{mathrm{Ar}}^{}{}_{}{}^{0}$, suggests that $ensuremath{Delta}Kensuremath{sim}0.6$ for a single-vacancy mechanism. {Here $f$ is the correlation factor and $ensuremath{Delta}Kensuremath{equiv}frac{(frac{ensuremath{omega}_{2}^{}{}_{}{}^{78}}{ensuremath{omega}_{2}^{}{}_{}{}^{86}}ensuremath{-}1)}{[{(frac{86}{78})}^{frac{1}{2}}ensuremath{-}1]}$, where ${ensuremath{omega}}_{2}$ is the tracer jump rate.}" @default.
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- W1999770246 date "1969-12-15" @default.
- W1999770246 modified "2023-09-23" @default.
- W1999770246 title "Diffusion of Kr Isotopes in Solid Ar" @default.
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- W1999770246 doi "https://doi.org/10.1103/physrev.188.1371" @default.
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