Sakae Takeuchi1, Kenji Suzuki1, Shigeru Tamaki1 and Takeyoshi Yanao2
1The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai
(1) To make clear the structure of liquid metals, it is necessary to measure scattering intensities of X-ray or neutron at various temperatures. For liquid Zn there is only a measurement of X-ray scattering intensity at 460°C performed by Gamertsfelder. Measurements of X-ray or neutron scattering in a higher temperature range is required in order to elucidate the structure change of liquid Zn with increasing temperatures.
(2) In this study measurements of neutron scattering intensities of liquid Zn at 550°, 650° and 800°C were performed and the temperature dependence of the correlation function a(K) in liquid state of Zn was obtained.
(3) The a(K) obtained at 550°C was very similar to that of Gamertsfelder's result at 460°C and a sub-peak in the range of small K, which was found in the measurement by Gamertsfelder at 460°C, was also observed at 550°C, but the height of the sub-peak decreased with increasing temperature and disappeared at high temperatures of 650° and 800°C.
(4) Temperature dependence of electrical resistivity of liquid Zn was calculated using the a(K) curves at 550°, 650° and 800°C and the pseudpotential V(K) of Zn by Animalu and Heine. The results obtained showed that the resistivity decreased with increasing temperature in agreement with the experimental results on resistivity.
(5) From the above calculation it becomes clear that the negative temperature coefficient of resistivity is mainly based on the temperature dependence of a(K) curves in the range of about K ≈ 0.5 × 2kf and cannot be explained by the concept of Bradley and et al., that the temperature dependence of resistivity originates from the broadening of the main peak of a(K) with increase in temperature.
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