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Thermophysical Characteristics of EuF2.136 Crystal

机译:EuF2.136晶体的热物理特性

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摘要

Single crystals of EuF2.136 solid solution with a f luorite-type structure (sp. gr. , a = 5.82171(5) ) have been grown by the Bridgeman method from a melt. Their thermal conductivity k(T) in the temperature range of 50-300 K and heat capacity D (D) (T) at 63-300 K have been studied experimentally for the first time. At T = 300 K the thermophysical characteristics are as follows: thermal conductivity k = 2.13 W/(m K), heat capacity D (D) = 73 J/(mol K), and phonon mean free path l a parts per thousand 11 . The temperature dependences of entropy S(T), enthalpy H(T), and phonon mean free path l(T) in EuF2.136 crystal are determined.
机译:通过Fridgeman方法从熔体中生长出具有氟沸石型结构(sp。gr。,a = 5.82171(5))的EuF2.136固溶体单晶。首次对它们在50-300 K温度范围内的导热系数k(T)和在63-300 K下的热容D(D)(T)进行了实验研究。在T = 300 K时,热物理特性如下:导热系数k = 2.13 W /(m K),热容D(D)= 73 J /(mol K),声子平均自由程l a千分之一11。确定了EuF2.136晶体中熵S(T),焓H(T)和声子平均自由程l(T)的温度依赖性。

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