Effect of the ionic radius on jump frequencies of alkaline earth cations in NaCl crystals |
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| Authors: | V. Trnovcová E. Majková J. Grňo |
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| Affiliation: | 1. Institute of Physics, Slovak Acad. Sci., Bratislava, Dúbravska cesta, 89930, Bratislava, Czechoslovakia
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| Abstract: | By comparing diffusion coefficientsD of bivalent cations Ba2+, Ca2+, Sr2+ in NaCl crystals it was shown that in the temperature range above 550 °CD (Ba2+)>D (Sr2+)>D (Ca2+) is valid. Temperature dependences of jump frequenciesw 2 of these cations are described byw 2 (Ba2+)=(2·15±0·55) × 1012 × exp {?(0·817±0.007)/kT};w 2 (Sr2+)=(2·9±1·1) × 1012 × exp {?(0·84±0.02)/kT} andw 2 (Ca2+)=(5·5±6·5) × 1010 × exp {?(0·51±0·07)/kT}. It was demonstrated that in NaCl crystals the activation enthalpy and the preexponential factor of the jump frequencyw 2 increase with increasing ionic radius and mass of the bivalent alkaline earth cation. |
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