A 3–350 K fast automatic small sample calorimeter
作者:
V. K. Pecharsky,
J. O. Moorman,
K. A. Gschneidner,
期刊:
Review of Scientific Instruments
(AIP Available online 1997)
卷期:
Volume 68,
issue 11
页码: 4196-4207
ISSN:0034-6748
年代: 1997
DOI:10.1063/1.1148367
出版商: AIP
数据来源: AIP
摘要:
A description of a fully automated calorimeter for rapid measuring the heat capacity of solids in the temperature region from∼3to∼350 Kand in magnetic fields from 0 to 10 T is given. A comprehensive mathematical analysis of the semiadiabatic heat pulse technique for heat capacity measurements on solid materials resulted in the development of the necessary formal algorithms for the complete automatization of the data collection process. Simultaneously a procedure for the on-line evaluation of uncertainties in the measured heat capacity data is developed. An approach which eliminates the need for a separate temperature sensor(s) attached to an adiabatic heat shield(s) used to maintain semiadiabatic conditions during heat pulse heat capacity measurements has been proposed and tested. The sensorless technique provides reliable control of the heat transfer inside a vacuum chamber and results in accurate heat capacity data. The calibration results show that the heat capacity can be measured with an average accuracy better than 1&percent; on small samples(∼1 g)over the whole temperature region. ©1997 American Institute of Physics.
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