THERMAL-EXPANSION OF CESIUM-HALIDES WITH THE CSCL STRUCTURE

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