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题名: An adiabatic calorimeter for heat capacity measurements of small samples - The heat capacity of nonlinear optical materials KTiOPO4 and RbTiOAsO4 crystals
作者: Tan, ZC;  Sun, GY;  Song, YJ;  Wang, L;  Han, JR;  Liu, YS;  Wang, M;  Nie, DZ
关键词: adiabatic calorimetry ;  heat capacity ;  nonlinear optical material ;  KTiOPO4 ;  RbTiOAsO4
刊名: THERMOCHIMICA ACTA
发表日期: 2000-07-03
卷: 352, 页:247-253
收录类别: ISTP ;  SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: A small sample size automated adiabatic calorimeter for measuring heat capacities in the temperature range of 60-360 K has been constructed. The sample cell of the calorimeter was made of thin-walled gold-plated copper with an internal volume of 6 cm(3), equipped with a miniature platinum thermometer, surrounded by two adiabatic shields and housed in a high vacuum can. Two sets of six-junction chromel-constantan thermocouples were mounted between the cell and shields to indicate the temperature difference between them. The lid of the cell was sealed to the main body with a special sealant cycleweld. The adiabatic conditions of the calorimeter cell were automatically controlled by two units of temperature controller. A mechanical pump was used to pump out the vapor of liquid nitrogen in the cryostat to obtain 60 K or even lower temperature. All the experimental data, including the electrical energy and temperature were collected and processed automatically by a personal computer with a predetermined program. The performance of the calorimeter was examined by measuring the heat capacities of alpha-Al2O3. The deviations of experimental results from the smoothed curve lie within +/-0.2%, while the inaccuracy is within +/-0.5% compared with the recommended reference data.
关键词[WOS]: LOW-TEMPERATURE ;  SYNTHETIC SAPPHIRE ;  FLUX GROWTH ;  RANGE
语种: 英语
WOS记录号: WOS:000087272900040
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138795
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
2.Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China

Recommended Citation:
Tan, ZC,Sun, GY,Song, YJ,et al. An adiabatic calorimeter for heat capacity measurements of small samples - The heat capacity of nonlinear optical materials KTiOPO4 and RbTiOAsO4 crystals[J]. THERMOCHIMICA ACTA,2000,352:247-253.
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