THERMAL TRANSPORT-PROPERTIES OF SINGLE-CRYSTAL LANTHANUM ALUMINATE

被引:41
作者
MICHAEL, PC
TREFNY, JU
YARAR, B
机构
[1] Colorado School of Mines, Golden
关键词
D O I
10.1063/1.352166
中图分类号
O59 [应用物理学];
学科分类号
摘要
The thermal diffusivity and thermal conductivity of single crystal (100) lanthanum aluminate (LaAlO3) have been determined in the temperature range 77-353 K. The thermal diffusivity was measured using a transient heat-pulse technique and the thermal conductivity by a steady state dc technique. The specific heat capacity was calculated from the thermal diffusivity and thermal conductivity data obtained. The temperature dependence of the thermal diffusivity was found to be of the form [T exp(T(D)/b(d)T)] and that of the thermal conductivity of the for [T3 exp(T(D)/b(c)T)]. Both results are consistent with the expected behavior of the thermal transport, limited by phonon-phonon collision ("Umklapp") processes, in high purity dielectric single crystals. The Debye temperature (T(D)) was calculated as 720+/-22 K and the parameters b(d) and b(c) were found to be 1.4+/-0. 1 and 0.7+/-0. 1, respectively. The average sound velocity was calculated to be (5.4+/-0.6) X 10(5) cm/s. The phonon mean-free-path at 303 K was found to be (2.2+/-0.2) X 10(-7) cm.
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页码:107 / 109
页数:3
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