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Thermal Properties of Nanocrystalline Silver

Published online by Cambridge University Press:  25 February 2011

Xijun Wu ,
Hongfei Zhang ,
Xiaoying Qin ,
Lifang Chen ,
Guanzhong Wang  and
Rongchuan Fang
Xijun Wu
Affiliation:
Institute of Solid State Physics, Academia Sinica, 230031 Hefei, China
Hongfei Zhang
Affiliation:
Institute of Solid State Physics, Academia Sinica, 230031 Hefei, China
Xiaoying Qin
Affiliation:
Institute of Solid State Physics, Academia Sinica, 230031 Hefei, China
Lifang Chen
Affiliation:
Institute of Solid State Physics, Academia Sinica, 230031 Hefei, China
Guanzhong Wang
Affiliation:
University of Science and Technology of China, 230026 Hefei, China
Rongchuan Fang
Affiliation:
University of Science and Technology of China, 230026 Hefei, China
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Abstract

The thermal properties of the nanocrystalline metal Ag (n-Ag), with the average grain size of 10 run, synthesized by an inert gas condensation and in situ compacting technique under different pressures of 0.2 to 1.5 GPa were studied. The thermal stable temperature for asprepared state is 373K, above which the grain growth appears at different rates. An exothermal peak and an endothermal peak occur on the DSC curves of the n-Ag. The enthalpy of both peaks are dependent upon the compacting pressure. Tht enhancement of the specific heat in going from the polycrystalline to the nanocrystalline state varies between 5.4% and 3.6% in the temperature range of 380K to 540K. The thermal diffusivity at room temperature increases with grain growth, and approaches to the corresponding value of the polycrystalline Ag.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 286: Symposium J – Nanophase and Nanocomposite Materials , 1992 , 149
Copyright
Copyright © Materials Research Society 1993

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References

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