Heat capacity measurement of dielectric solids using a linear surface heater: Application to ferroelectrics
作者:
Seung‐Min Lee,
Sook‐ll Kwun,
期刊:
Review of Scientific Instruments
(AIP Available online 1994)
卷期:
Volume 65,
issue 4
页码: 966-970
ISSN:0034-6748
年代: 1994
DOI:10.1063/1.1144927
出版商: AIP
数据来源: AIP
摘要:
A new ac calorimetry for dielectric solids was developed. A long and thin metal strip directly evaporated onto the surface of the sample is used as a heater and thermometer. Temperature oscillation of the heater is measured from the third harmonic voltage at the heater. Both the heat capacity and thermal conductivity of the sample are obtained by the frequency dependent phase and amplitude of the third harmonic voltage. Since heat capacity addenda and heat leaks in the measurement are extremely small, prior calibration is not required. The calorimeter is fully automated and has been tested on two ferroelectrics, KH2PO4and triglycine sulfate, at temperatures above 77 K. The optimal frequency region for the calorimetry is also discussed.
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