Melting and freezing plateau shapes of high-temperature fixed-point cells using metal-carbon eutectics were investigated in temperature uniform furnaces. The plateau shapes were quite rounded in contrast to the flat plateau of the copper point. The shape was compared among different melting and freezing rates, different crucible sizes, and different purity of the material. The plateau shape seemed to be strongly affected by the material purities only. The results show that the material purity can become a major source of uncertainty for metal-carbon eutectic fixed points.
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