A METHOD OF MEASUREMENT OF THERMAL-CONDUCTIVITY - APPLICATION TO FREESTANDING DIAMOND SHEET

被引:16
作者
KOSKY, PG
机构
关键词
D O I
10.1063/1.1144126
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Self-supporting diamond sheets, made by the metastable chemical vapor deposition (CVD) technique, have been reported to have a range of properties, presumably dependent on the morphological details and the impurity burden of the particular sample. CVD diamonds are typically in the form of large area (i.e., many square cm) sheets averaging a few hundred microns in thickness. For this form of matter, a novel method of thermal conductivity measurement is reported based upon the well-known principle of the phase lag of a traveling thermal wave. In the present variation of this technique, the traveling wave traverses the diamond sheet from its leading edge (which was pulsed with an infrared diode laser) through the point of measurement. The average thermal diffusivity of the sheet was calculated. The equipment is relatively simple and the sample preparation minimal. Both theoretical and experimental details are given. The random error in thermal diffusivity measurements is estimated to be about 7% due mainly to uncertainties in estimating the delay time lag of the thermal wave as it travels along the length of the diamond sheet.
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页码:1071 / 1075
页数:5
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