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- W2084331315 abstract "Self-diffusion in tellurium has been determined directly and unambiguously using a ${mathrm{Te}}^{127m}$ radiotracer in polycrystalline and dislocated single-crystal tellurium samples. The data along the grain boundaries between 280 and 390ifmmode^circelsetextdegreefi{}C can be represented by ${D}_{mathrm{GB}}=7.47ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4} mathrm{exp}[frac{(ensuremath{-}0.87ifmmodepmelsetextpmfi{}0.08 mathrm{eV})}{mathrm{kT}}]$ ${mathrm{cm}}^{2}$/sec, whereas those along the edge (between 253 and 401ifmmode^circelsetextdegreefi{}C) and screw (between 275 and 380ifmmode^circelsetextdegreefi{}C) dislocations are described by ${D}_{mathrm{ED}}=9.67ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}6} mathrm{exp}[frac{(ensuremath{-}0.65ifmmodepmelsetextpmfi{}0.02 mathrm{eV})}{mathrm{kT}}]$ ${mathrm{cm}}^{2}$/sec and ${D}_{mathrm{SD}}=7.12ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}3} mathrm{exp}[frac{(ensuremath{-}0.98ifmmodepmelsetextpmfi{}0.10mathrm{eV})}{mathrm{kT}}]$ ${mathrm{cm}}^{2}$/sec, respectively. From these data, in conjunction with the available lattice-diffusivity data in single crystals, it is estimated that the activation energy of the motion of vacancies in tellurium is about 0.7 eV along [0001] and 1 eV along $〈10overline{1}0〉$ or $〈11overline{2}0〉$. The use of Fisher's analysis of Harrison's type-B diffusion kinetics, along with the directly measured data along dislocations and grain boundaries, substantiated the model of grain boundaries as a single-line array of dislocations. But the values of effective grain-boundary thickness and dislocation diameters obtained using the same analysis (1.5ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}5}$ cm) is about two orders of magnitude higher than usually assumed in grain-boundary diffusion studies." @default.
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- W2084331315 date "1967-03-15" @default.
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- W2084331315 title "Self-Diffusion in Tellurium. II. Grain Boundary and Dislocation Effects" @default.
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- W2084331315 doi "https://doi.org/10.1103/physrev.155.603" @default.
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