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Dependence of electrical and thermal conductivity on temperature in directionally solidified Sn–3.5 wt% Ag eutectic alloy

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Abstract

Sn–3.5 wt% Ag alloy was directionally solidified upward with a constant growth rate (V = 16.5 μm/s) and a temperature gradient (G = 3.3 K/mm) in a Bridgman-type growth apparatus. The variations of electrical resistivity (ρ) with temperature in the range of 293–476 K for the directionally solidified Sn–3.5 wt% Ag eutectic alloy was measured. The measurements indicate that the electrical resistivity of the directionally solidified Sn–Ag eutectic solder increases with increasing temperature. The variations of thermal conductivity of solid phases versus temperature for the same alloy was determined from the Wiedemann-Franz and Smith-Palmer equations by using the measured values of electrical conductivity. From the graphs of electrical resistivity and thermal conductivity versus temperature, the temperature coefficient of electrical resistivity (α TCR ) and the temperature coefficient of thermal conductivity (α TCT ) for the same alloy were obtained. According to experimental results, the electrical and thermal conductivity of Sn–Ag eutectic solder linearly decrease with increasing the temperature. The enthalpy of fusion (ΔH) and the change of specific heat (ΔC P ) during the transformation at the studied alloy were determined from heating curve during the transformation from eutectic solid to eutectic liquid by means of differential scanning calorimeter (DSC).

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Acknowledgments

This project was supported by the Niğde University Scientific Research Project Unit under Contract No: FEB 2009/02. Authors would like to thank to the Niğde University Scientific Research Project Unit for their financial support.

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Authors and Affiliations

  1. Department of Physics, Faculty of Arts and Sciences, Niğde University, Niğde, Turkey

    E. Çadırlı, M. Şahin & R. Kayalı

  2. Department of Physics, Faculty of Arts and Sciences, Erciyes University, Kayseri, Turkey

    M. Arı

  3. Department of Physics, Institute of Science and Technology, Erciyes University, Kayseri, Turkey

    S. Durmuş

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  1. E. Çadırlı
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  2. M. Şahin
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  3. R. Kayalı
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Correspondence to E. Çadırlı.

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Çadırlı, E., Şahin, M., Kayalı, R. et al. Dependence of electrical and thermal conductivity on temperature in directionally solidified Sn–3.5 wt% Ag eutectic alloy. J Mater Sci: Mater Electron 22, 1709–1714 (2011). https://doi.org/10.1007/s10854-011-0350-9

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  • DOI: https://doi.org/10.1007/s10854-011-0350-9

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