Drift mobility and diffusion with an electric field of Ba2+ ions in NaCl crystals |
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Authors: | J. Grňo V. Trnovcová |
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Affiliation: | (1) Institute of Physics, Slovak Acad. Sci., Dúbravská cesta, 899 30 Bratislava, Czechoslovakia |
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Abstract: | Using a carrier-free tracer133Ba the temperature dependences of the diffusion coefficientD and mobility of Ba2+ ions in an electric field have been measured on NaCl crystals in the temperature range from 500 to 750 °C. It is shown that the obtained values ofD are not affected by an electric field ( 30 V/cm) and that the temperature dependence of the mobility of Ba2+ ions is given by (T)=(12·3±1·9) exp [-(1·51±0·09) eV/kT]. Vacancy jump frequencies near a Ba2+ ion and the Gibbs free energy of association of this ion with a vacancy have been calculated in terms of a simple 5-frequency model for impurity diffusion by a vacancy mechanism. |
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