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题名: Low temperature heat capacities and thermodynamic functions of potassium dichromate
作者: Nan, ZD;  Tan, ZC;  Sun, LX
关键词: potassium dichromate (K2Cr2O7)) ;  low-temperature heat capacity ;  thermodynamic function ;  adiabatic calorimetry
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 2002-10-01
DOI: 10.3866/PKU.WHXB20021017
卷: 18, 期:10, 页:947-951
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The molar heat capacities ( C-p,C-m) of crystalline potassium dichromate (K2Cr2O7) were measured with a precision automated adiabatic calorimeter over the temperature range from 100 K to 390 K. No phase transition or other thermal anomaly was observed in this temperature region. However, it was found that the relationship of C-p,C-m with respect to temperature T is different in different temperature regions. The polynomial functions of C-p,C-m vs. T were established in different temperature regions based on the heat capacity measurements by means of the least-fitting square method. These functions are as following: for 100 K less than or equal to T less than or equal to 275 K, C-p,C-m = 0. 005 T-2 - 1.0320 T + 125. 22 (J . K-1 . mol (-1)); for 275 K less than or equal to T less than or equal to 350 K, C-p.m = 209. 37 J . K-1 . mol - 1; for 350 K less than or equal to T less than or equal to 390 K, C-p,C-m = 0. 0266T(2) - 18. 823T + 3542. 3 J . K-1 . mol (-1). According to the relationship of C-p,C-m vs. T and thermodynamic equations, the values of thermodynamic function of potassium dichromate were calculated in the temperature range of 298. 15 similar to 400. 15 K with 5 K intervals.
语种: 英语
WOS记录号: WOS:000178709800018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139114
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

Recommended Citation:
Nan, ZD,Tan, ZC,Sun, LX. Low temperature heat capacities and thermodynamic functions of potassium dichromate[J]. ACTA PHYSICO-CHIMICA SINICA,2002,18(10):947-951.
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