Preparation, Characterization, and Low-Temperature Heat Capacities of Nanocrystalline TiO2 Ultrafine Powder

Nanocrystalline TiO2 ultrafine powders with different grain sizes have been prepared by the sol–gel method. The grain sizes and the crystalline phases have been determined. Heat capacities in the temperature range of 78–370 K have also been measured, and the polynomial equations expressing the chang...

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Bibliographic Details
Published in:Journal of solid state chemistry 2001-01, Vol.156 (1), p.220-224
Main Authors: Wu, Xin-Ming, Wang, Lan, Tan, Zhi-Cheng, Li, Guang-Hai, Qu, Song-Sheng
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
crystalline phase
Disperse systems
Exact sciences and technology
General and physical chemistry
grain size
low-temperature heat capacity
Materials science
nanocrystalline TiO2
Nanoscale materials and structures: fabrication and characterization
Physics
Powders
Thermal properties of condensed matter
Thermal properties of small particles, nanocrystals, nanotubes
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Summary:Nanocrystalline TiO2 ultrafine powders with different grain sizes have been prepared by the sol–gel method. The grain sizes and the crystalline phases have been determined. Heat capacities in the temperature range of 78–370 K have also been measured, and the polynomial equations expressing the change of heat capacity with temperature were fitted. The obtained values of the heat capacity have been compared with those of the bulk crystal from the literature. The relations between heat capacity and the grain size of nanocrystalline TiO2 have been discussed in terms of energy.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.2000.8991