Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 55: Issue 1
A Low-temperature Automated Adiabatic Calorimeter Heat Capacities of High-purity Graphite and Polystyrene
Authors:
Zhi-Cheng TanChinese Academy of Sciences Thermochemistry Laboratory, Dalian Institute of Chemical Physics Dalian 116023 People's Republic of China Dalian 116023 People's Republic of China

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Ji-Biao ZhangChinese Academy of Sciences Thermochemistry Laboratory, Dalian Institute of Chemical Physics Dalian 116023 People's Republic of China Dalian 116023 People's Republic of China

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Meng Shang-HeChinese Academy of Sciences Thermochemistry Laboratory, Dalian Institute of Chemical Physics Dalian 116023 People's Republic of China Dalian 116023 People's Republic of China

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Pages:
283–289
Online Publication Date:
16 Aug 2006
Publication Date:
01 Jan 1999
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010177331806
Keywords:
adiabatic calorimeter; α-Al2O3; graphite; heat capacity; polystyrene
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Abstract  

A computerized adiabatic calorimeter for heat capacity measurements in the temperature range 80–400 K has been constructed. The sample cell of the calorimeter, which is about 50 cm3 in internal volume, is equipped with a platinum resistance thermometer and surrounded by an adiabatic shield and a guard shield. Two sets of 6-junction chromel-copel thermocouples are mounted between the cell and the shields to indicate the temperature differences between them. The adiabatic conditions of the cell are automatically controlled by two sets of temperature controller. The reliability of the calorimeter was verified through heat capacity measurements on the standard reference material α-Al2O3. The results agreed well with those of the National Bureau of Standards (NBS): within 0.2% throughout the whole temperature region. The heat capacities of high-purity graphite and polystyrene were precisely measured in the interval 260–370 K by using the above-mentioned calorimeter. The results were tabulated and plotted and the thermal behavior of the two materials was discussed in detail. Polynomial expressions for calculation of the heat capacities of the two substances are presented.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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