Construction of Gallium Point at NMIJ

  • J. V. WidiatmoEmail author
  • I. Saito
  • K. Yamazawa
Part of the following topical collections:
  1. TEMPMEKO 2016: Selected Papers of the 13th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science


Two open-type gallium point cells were fabricated using ingots whose nominal purities are 7N. Measurement systems for the realization of the melting point of gallium using these cells were built. The melting point of gallium is repeatedly realized by means of the measurement systems for evaluating the repeatability. Measurements for evaluating the effect of hydrostatic pressure coming from the molten gallium existing during the melting process and the effect of gas pressure that fills the cell were also performed. Direct cell comparisons between those cells were conducted. This comparison was aimed to evaluate the consistency of each cell, especially related to the nominal purity. Direct cell comparison between the open-type and the sealed-type gallium point cell was also conducted. Chemical analysis was conducted using samples extracted from ingots used in both the newly built open-type gallium point cells, from which the effect of impurities in the ingot was evaluated.


Fixed points Gallium melting point Gallium point cell International Temperature Scale of 1990 Standard platinum resistance thermometer 


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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.National Metrology Institute of JapanAISTTsukubaJapan
  2. 2.National Institute of Technology and EvaluationTokyoJapan

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