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Highly Precise Realization of the Indium Freezing Point |
WANG Ning1,YAN Xiao-ke1,ZHANG Ming-yu1,HE Pei2 |
1. National Institute of Metrology, Beijing 100029, China
2. University of Science & Technology Beijing, Beijing 100083, China |
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Abstract A stainless-steel-cased indium cell was utilized to precisely realize the indium melting and freezing plateaus using a continuous heat flux method. The liquidus temperatures of indium were determined by one linear fitting method, and the differences between the liquidus temperatures and the maximum values of the freezing plateaus were regarded as indicators for evaluating the quality of the indium cell. The results showed that these differences were within 0.27mK. Also, the vertical temperature uniformity within 16cm from the thermometer well bottom did not exceed 13mK. Therefore, the stainless-steel-cased cell can meet the requirements for high-precision temperature dissemination. In addition, the influence of furnance setting temperatures on the duration of the freezing plateau and supercooling were also studied.
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Received: 18 August 2020
Published: 24 May 2021
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