Thermal Properties of Dislocated Lithium Fluoride Crystals

概要

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Experimental results previously obtained by the authors on low-temperaturethermal properties of lithium fluoride crystals containing dislocations: have beenreanalyzed. Specific heat increase by the introduced dislocations was well explainedwhen Debye-type extra quasilocal phonons were anticipated. The phononsspatially localized in a rather extended region around each dislocation line. Thenumber of the quasilocal modes increased with the density of dislocations incrystals. Thermal diffusivity data were analyzed by taking into account both thescattering of conducting thermal phonons by dynamical effect of dislocations andthe scattering by quasilocal phonons around dislocations. The quasiJoca] phononscattering increased in proportion to the dislocation density, while thc>dynamicalscattering increased at a lower rate. Analysis of thermal conductivity d[ata showedthat the apparent Debye temperature of crystal was decreased, namely, specificheat increased, by the introduction of dislocations. The results of the analyses ofthree kinds of thermal properties were consistent enough with each other.
社団法人日本物理学会の論文
1981-07-15