标题: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
通讯作者:Tan, ZC
作者机构:[Tan, ZC; Sun, GY; Song, YJ; Wang, L; Han, JR; Liu, YS; Wang, M; Nie, DZ]Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 更多
会议名称:2nd International/4th Japan-China Joint Symposium onCalorimetry and Thermal Analysis (CATS-99)
会议日期:JUN 01-03, 1999
来源:THERMOCHIMICA ACTA
出版年:2000
卷:352
页码:247-253
DOI:10.1016/S0040-6031(99)00473-6
关键词:adiabatic calorimetry; heat capacity; nonlinear optical material;; KTiOPO4; RbTiOAsO4
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.; The heat capacities of two important nonlinear optical crystals KTiOPO4 and RbTiOAsO4 have been measured by using this calorimeter in the range of 60-360 K, No thermal anomaly was observed from the heat capacity measurements for the two materials in the above-mentioned range. (C) 2000 Elsevier Science B.V. All rights reserved.
收录类别:CPCI-S;SCOPUS;SCIE
WOS核心被引频次:28
Scopus被引频次:47
资源类型:会议论文;期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034600724&doi=10.1016%2fS0040-6031%2899%2900473-6&partnerID=40&md5=710220b4ccb4cfa964ad000988ea5d25
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