Thermal conductivity of single crystals with a fluorite structure: Cadmium fluorideстатья
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Дата последнего поиска статьи во внешних источниках: 3 октября 2019 г.
Аннотация:The thermal conductivity of Ca, Sr, Ba, and Cd difluoride single crystals and the CdF2 samples doped by 3 mol % NdF3, 15 mol % HoF3, and 10 mol % ErF3 has been studied using the method of steady longitudinal heat flow in the temperature range 50–300 K. The thermal conductivity of the matrices of these compounds decreases in the order CaF2-SrF2-BaF2-CdF2. The temperature dependences of the phonon mean free path for these crystals have been calculated from experimental data and exhibit different behaviors. It has been assumed that the intense phonon scattering observed in the undoped CdF2 sample is caused by the specific features of the processes of phonon-phonon scattering. The formation of heterovalent solid solutions of cadmium difluoride and rare-earth trifluorides is accompanied by a drastic decrease in the thermal conductivity and a change in its character from that typical of dielectric single crystals to that typical of glassy materials.