Heat capacities and thermodynamic properties of a H2O+Li2B4O7 solutionin the temperature range from 80 to 356 K

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	Heat capacities and thermodynamic properties of a H2O+Li2B4O7 solutionin the temperature range from 80 to 356 K
	Zhang, Zhi-Heng; Yin, Guo-Yin; Tan, Zhi-Cheng; Yao, Yan; Sun, Li-Xian
	2006
发表期刊	JOURNAL OF SOLUTION CHEMISTRY
ISSN	0095-9782
卷号	35 期号:10 页码:1347-1355
摘要	The molar heat capacities of an aqueous Li2B4O7 solution were measured with a precision automated adiabatic calorimeter in the temperature range from 80 to 356 K at a concentration of 0.3492 mol . kg(-1). The occurrence of a phase transition was determined based on the changes in the curve of the heat capacity with temperature. A phase transition was observed at 271.72 K corresponding to the solid-liquid phase transition; the enthalpy and entropy of the phase transition were evaluated to be Delta H-m = 4.110 kJ . mol(-1) and Delta S-m = 15.13 J . K-1 . mol(-1), respectively. Using polynomial equations and the thermodynamic relationship, the thermodynamic functions [H-T-H-298.15] and [S-T-S-298.15] of the aqueous Li2B4O7 solution relative to 298.15 K were calculated in the temperature range 80 to 355 K at intervals of 5 K. Values of the relative apparent molar heat capacities of the aqueous Li2B4O7 solution, C-p,C-phi, were calculated at every 5 K in the temperature range from 80 to 355 K from the experimental heat capacities of the solution and the heat capacities of pure water. The molar heat capacities of an aqueous Li2B4O7 solution were measured with a precision automated adiabatic calorimeter in the temperature range from 80 to 356 K at a concentration of 0.3492 mol . kg(-1). The occurrence of a phase transition was determined based on the changes in the curve of the heat capacity with temperature. A phase transition was observed at 271.72 K corresponding to the solid-liquid phase transition; the enthalpy and entropy of the phase transition were evaluated to be Delta H-m = 4.110 kJ . mol(-1) and Delta S-m = 15.13 J . K-1 . mol(-1), respectively. Using polynomial equations and the thermodynamic relationship, the thermodynamic functions [H-T-H-298.15] and [S-T-S-298.15] of the aqueous Li2B4O7 solution relative to 298.15 K were calculated in the temperature range 80 to 355 K at intervals of 5 K. Values of the relative apparent molar heat capacities of the aqueous Li2B4O7 solution, C-p,C-phi, were calculated at every 5 K in the temperature range from 80 to 355 K from the experimental heat capacities of the solution and the heat capacities of pure water.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2303
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
推荐引用方式 GB/T 7714	Zhang, Zhi-Heng,Yin, Guo-Yin,Tan, Zhi-Cheng,et al. Heat capacities and thermodynamic properties of a H2O+Li2B4O7 solutionin the temperature range from 80 to 356 K[J]. JOURNAL OF SOLUTION CHEMISTRY,2006,35(10):1347-1355.
APA	Zhang, Zhi-Heng,Yin, Guo-Yin,Tan, Zhi-Cheng,Yao, Yan,&Sun, Li-Xian.(2006).Heat capacities and thermodynamic properties of a H2O+Li2B4O7 solutionin the temperature range from 80 to 356 K.JOURNAL OF SOLUTION CHEMISTRY,35(10),1347-1355.
MLA	Zhang, Zhi-Heng,et al."Heat capacities and thermodynamic properties of a H2O+Li2B4O7 solutionin the temperature range from 80 to 356 K".JOURNAL OF SOLUTION CHEMISTRY 35.10(2006):1347-1355.