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Thermal expansion of caesium halides has been approximated by a quasiharmonic approach (QHM) [Reeber (1975). Phys. Status Solidi A, 32, 321-331; Reeber & Haas (1984). Thermal Expansion, Vol. 8, pp. 31-48] and predicted at high temperature with a modified quasiharmonic model (MQHM) [Wang & Reeber (1995). J. Phys. Chem. Solids, in the press]. Formation enthalpies of high-temperature defects have also been obtained by fitting lattice differences between a real and an approximate perfect crystal (QHM). Typical values of the coefficients of thermal expansion and lattice parameters are given.
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