Heat capacities and thermodynamic functions of the aqueous Li2B4O7solution in the temperature range from 80 K to 355 K

ISL OpenIR > 青海盐湖研究所知识仓储

	Heat capacities and thermodynamic functions of the aqueous Li2B4O7solution in the temperature range from 80 K to 355 K
	Zhang, Zhi-HengTan, Zhi-Cheng; Yin, Guo-Yin; Yao, Yan; Sun, Li-Xian; Li, Yan-Sheng
	2007
发表期刊	JOURNAL OF CHEMICAL AND ENGINEERING DATA
ISSN	0021-9568
卷号	52 期号:3 页码:866-870
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. 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.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2289
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-HengTan, Zhi-Cheng,Yin, Guo-Yin,Yao, Yan,et al. Heat capacities and thermodynamic functions of the aqueous Li2B4O7solution in the temperature range from 80 K to 355 K[J]. JOURNAL OF CHEMICAL AND ENGINEERING DATA,2007,52(3):866-870.
APA	Zhang, Zhi-HengTan, Zhi-Cheng,Yin, Guo-Yin,Yao, Yan,Sun, Li-Xian,&Li, Yan-Sheng.(2007).Heat capacities and thermodynamic functions of the aqueous Li2B4O7solution in the temperature range from 80 K to 355 K.JOURNAL OF CHEMICAL AND ENGINEERING DATA,52(3),866-870.
MLA	Zhang, Zhi-HengTan, Zhi-Cheng,et al."Heat capacities and thermodynamic functions of the aqueous Li2B4O7solution in the temperature range from 80 K to 355 K".JOURNAL OF CHEMICAL AND ENGINEERING DATA 52.3(2007):866-870.