A theoretical study of alkaline-earth cations in crystalline sodium chloride,potassium chloride and potassium bromide |
| |
Authors: | CRA Catlow J Corish JM Quigley PWM Jacobs |
| |
Institution: | Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, England;Department of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland;Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada |
| |
Abstract: | Theoretical methods, based on Mott-Littleton techniques are used to investigate the defect structures of alkali-halide crystals doped with divalent ions. The systems studied are those having Mg2+, Ca2+, Sr2+ and Ba2+ as impurity ions in NaCl, KCl and KBr crystals. Our calculations find comparable stability of the (110) nearest-neighbour and (200) next-nearest-neighbour complexes whereas the (211) complex is found to be less stable. Significant trends in the variation of binding energy with dopant ion radius are predicted. We also consider the activation energies for the w1, w2, w3 and w4 type jumps which occur in the vicinity of the impurity ion. The results are, where possible, compared with experimentally determined defect energies and their implications in diffusion processes of M2+ impurities in the alkali halides are discussed. |
| |
Keywords: | Author for Correspondence |
本文献已被 ScienceDirect 等数据库收录! |
|