<正> 我们采用自行建立的精密自动绝热量热装置(见图1),将加热器的绕线Karma合金丝作试样,稍加改进量热操作技术,精确测定了70—440K温度区间Karma合金丝的电阻率。 先将图1中薄壁紫铜管加热器涂绝缘漆,螺旋双绕Karma合金丝,再涂漆固定,注意防止漆层剥落。引出丝的末端以备测量电压电流。铜管
The precise measurement of electrical resistivity of Karma alloy in the temperature range from 70 to 440 K was conducted in the further development of an adiabatic calorimeter. The minimum and maximum resistivity was obtained as 133.340 and 133.906 μΩcm respectively. A maximum near 340 K on the plot of temperature dependence upon resistivity is an anomaly that seems to be neceessary for any further study.
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