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题名: Heat capacity enhancement and thermodynamic properties of nanostructured amorphous SiO2
作者: Wang, L;  Tan, ZC;  Meng, SH;  Druzhinina, A;  Varushchenko, RA;  Li, GH
刊名: JOURNAL OF NON-CRYSTALLINE SOLIDS
发表日期: 2001-12-01
卷: 296, 期:1-2, 页:139-142
收录类别: SCI
文章类型: Letter
部门归属: 5130
项目归属: 507
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Materials Science, Ceramics ;  Materials Science, Multidisciplinary
研究领域[WOS]: Materials Science
英文摘要: The heat capacity of nanostructured amorphous SiO2 (na-SiO2) has been measured by adiabatic calorimetric method over the temperature range 9-354 K. TG and differential scanning calorimeter (DSC) were also employed to determine the thermal stability. Glass transition temperature (T-g) for the two same grain sizes with different specific surface of naSiO(2) samples and one coarse-grained amorphous SiO2 (ca-SiO2) sample were determined to be 1377, 1397 and 1320 K, respectively. The low temperature experimental results show that there are significant heat capacity (C-P) enhancements among na-SiO2 samples and ca-SiO2. Entropy, enthalpy, Gibbs free energy and Debye temperature (theta (D)) were obtained based on the low temperature heat capacity measurement of na-SiO2. The Cp enhancements of na-SiO2 were discussed in terms of configurational and vibrational entropy. (C) 2001 Elsevier Science B.V. All rights reserved.
关键词[WOS]: NANOCRYSTALLINE MATERIALS
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000172411600017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/84259
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.Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia
3.Acad Sinica, Inst Solid State Phys, Hefei 230031, Peoples R China

Recommended Citation:
Wang, L,Tan, ZC,Meng, SH,et al. Heat capacity enhancement and thermodynamic properties of nanostructured amorphous SiO2[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS,2001,296(1-2):139-142.
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