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题名: Low-temperature heat capacities and thermodynamic properties of octahydrated barium dihydroxide, Ba(OH)2 center dot 8H(2)O(S)
作者: Di You-Ying;  Tan Zhi-Cheng;  Sun Li-Xian
关键词: adiabatic calorimetry ;  heat capacity ;  phase transition ;  thermodynamic function ;  thermal decomposition
刊名: CHINESE JOURNAL OF CHEMISTRY
发表日期: 2007-05-01
卷: 25, 期:5, 页:587-591
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Low-temperature heat capacities of octahydrated barium dihydroxide, Ba(OH)(2)center dot 8H(2)O(s), were measured by a precision automated adiabatic calorimeter in the temperature range from T=78 to 370 K. An obvious endothermic process took place in the temperature range of 345-356 K. The peak in the heat capacity curve was correspondent to the sum of both the fusion and the first thermal decomposition or dehydration. The experimental molar heat capacities in the temperature ranges of 78-345 K and 356-369 K were fitted to two polynomials. The peak temperature, molar enthalpy and entropy of the phase change have been determined to be (355.007 +/- 0.076) K, (73.506 +/- 0.011) kJ.mol(-1) and (207.140 +/- 0.074) J.K-1.mol(-1), respectively, by three series of repeated heat capacity measurements in the temperature region of 298-370 K. The thermodynamic functions, (H-T-H-298.15 (K)) and (S-T-S-298.15 K), of the compound have been calculated by the numerical integral of the two heat-capacity polynomials. In addition, DSC and TG-DTG techniques were used for the further study of thermal behavior of the compound. The latent heat of the phase change became into a value larger than that of the normal compound because the melting process of the compound must be accompanied by the thermal decomposition or dehydration of 7H(2)O.
语种: 英语
WOS记录号: WOS:000246644100002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140515
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.Liaocheng Univ, Coll Chem & Chem Engn, Shandong 252059, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Di You-Ying,Tan Zhi-Cheng,Sun Li-Xian. Low-temperature heat capacities and thermodynamic properties of octahydrated barium dihydroxide, Ba(OH)2 center dot 8H(2)O(S)[J]. CHINESE JOURNAL OF CHEMISTRY,2007,25(5):587-591.
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