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题名: Heat capacities and thermodynamic functions of the aqueous Li2B4O7 solution in the temperature range from 80 K to 355 K
作者: Zhang, Zhi-Heng;  Tan, Zhi-Cheng;  Yin, Guo-Yin;  Yao, Yan;  Sun, Li-Xian;  Li, Yan-Sheng
通讯作者: 谭志诚
刊名: JOURNAL OF CHEMICAL AND ENGINEERING DATA
发表日期: 2007-05-01
DOI: 10.1021/je060462d
卷: 52, 期:3, 页:866-870
收录类别: SCI
文章类型: Article
部门归属: 15
项目归属: 1504
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The molar heat capacities of the aqueous Li2B4O7 solution at the concentration of 0.0187 mol.kg(-1) have been measured using a precision automated adiabatic calorimeter in the temperature range from 80 K to 355 K. The dependence of the molar heat capacity on temperature was given as a function of the reduced temperature X by polynomial equations C-p,C-m (J.K-1.mol(-1)) = 25.44 + 11.99X + 0.454X(2) + 1.671X(3) for the solid phase [80 K similar to 258 K, X = (T - 169)/89] and C-p,C-m (J.K-1.mol(-1)) = 77.33 for the liquid phase [274 K similar to 355 K], respectively. The phase transition of the solution was determined on the basis of the curve of the heat capacity with temperature. The temperature of the phase transition was observed at 273.04 K, and the enthalpy and entropy of the phase transition were calculated to be Delta H-m = 4.650 kJ.mol(-1) and Delta S-m = 17.03 J.K-1.mol(-1), respectively. According to the polynomial equations and thermodynamic relationship, the values of the thermodynamic function of the aqueous Li2B4O7 solution relative to 298.15 K were calculated in the temperature range from 80 K to 355 K with an interval of 5 K. The relative apparent molar heat capacities of the aqueous Li2B4O7 solution, C-p,C-phi, were calculated every 5 K in the temperature range from 80 K to 355 K from the experimental heat capacities of the aqueous Li2B4O7 solution and the heat capacities of pure water.
关键词[WOS]: THERMOCHEMISTRY ;  REPRESENTATION ;  CALORIMETER ;  CHLORIDE ;  MODEL
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000246372100036
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99653
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.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
3.Dalian Jiaotong Univ, Coll Environm Sci & Engn, Dalian 116028, Peoples R China

Recommended Citation:
Zhang, Zhi-Heng,Tan, Zhi-Cheng,Yin, Guo-Yin,et al. Heat capacities and thermodynamic functions of the aqueous Li2B4O7 solution in the temperature range from 80 K to 355 K[J]. JOURNAL OF CHEMICAL AND ENGINEERING DATA,2007,52(3):866-870.
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