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Thermodynamic investigation of crystalline K2Cr2O7 and aqueous K2Cr2O7 solution
Nan, ZD; Lan, XZ; Sun, LX; Tan, ZC
关键词Heat Pipe Working Fluid Potassium Dichromate Aqueous Solution Heat Capacity Thermodynamic Function Adiabatic Calorimetry
刊名INTERNATIONAL JOURNAL OF THERMAL SCIENCES
2003-07-01
DOI10.1016/S1290-0729(03)00031-0
42期:7页:657-664
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Technology
类目[WOS]Thermodynamics ; Engineering, Mechanical
研究领域[WOS]Thermodynamics ; Engineering
关键词[WOS]HEAT-CAPACITIES ; PIPES
英文摘要The molar heat capacities (C-p,C-m) of crystalline potassium dichromate (K2Cr2O7 (cr)) and aqueous K2Cr2O7 solution (0.1699 mol(.)kg(-1)) were measured in the temperature range from 100 to 390 K and from 80 to 370 K by an automatic adiabatic calorimeter equipped with a small cell of internal volume of 6 cm(3), respectively. No phase transition took place in the temperature range from 100 to 390 K for K2Cr2O7 (cr). The relationships of C-p,C-m of K2Cr2O7 (cr) with respect to T were established to be C-p,C-m = 177.53 + 161.92X - 138.14X(2) - 209.67X(3) + 160.35X(4) + 137.44X(5) - 41.291X(6) and C-p,C-m = 177.52 + 171.66X - 149.59X(2) - 246.17X(3) + 194.79X(4) + 167.30X(5) - 64.368X(6) (X = (T - 245.00)/145.00) for Series I and Series 2 experiments, respectively. No phase transition took place for the solution from 80 to 270 K. The function of C-p,C-m of the solution with respect to T was established to be C-p,C-m = 0.137T + 2.5068 [J(.)K(-1.)mol(-1)]. A fusion transition at T-fus = 272.19 K was found from the C-p,C-m-T curve of the solution. The molar enthalpy and entropy of the phase transition were calculated to be 6.115 kJ(.)mol(-1) and 22.47 J(.)K(-1.)mol(-1), respectively. The molar heat capacities of the solution are about a constant in the temperature range from 275 K to 370 K, C-p,C-m =76.75 +/- 1.12 [J(.)K(-1.)mol(-1)]. The thermodynamic data of K2Cr2O7 (cr) and the solution were derived from the heat capacity data and the relationship of thermodynamic functions. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
语种英语
WOS记录号WOS:000183949600003
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/138287
专题中国科学院大连化学物理研究所
作者单位1.Qufu Normal Univ, Dept Chem, Qufu 273165, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
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GB/T 7714
Nan, ZD,Lan, XZ,Sun, LX,et al. Thermodynamic investigation of crystalline K2Cr2O7 and aqueous K2Cr2O7 solution[J]. INTERNATIONAL JOURNAL OF THERMAL SCIENCES,2003,42(7):657-664.
APA Nan, ZD,Lan, XZ,Sun, LX,&Tan, ZC.(2003).Thermodynamic investigation of crystalline K2Cr2O7 and aqueous K2Cr2O7 solution.INTERNATIONAL JOURNAL OF THERMAL SCIENCES,42(7),657-664.
MLA Nan, ZD,et al."Thermodynamic investigation of crystalline K2Cr2O7 and aqueous K2Cr2O7 solution".INTERNATIONAL JOURNAL OF THERMAL SCIENCES 42.7(2003):657-664.
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