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International Journal of Thermophysics

, Volume 29, Issue 1, pp 112–118 | Cite as

Realization of the Gallium Triple Point at NMIJ/AIST

  • T. Nakano
  • O. Tamura
  • H. Sakurai
Article

Abstract

The triple point of gallium has been realized by a calorimetric method using capsule-type standard platinum resistance thermometers (CSPRTs) and a small glass cell containing about 97 mmol (6.8 g) of gallium with a nominal purity of 99.99999%. The melting curve shows a very flat and relatively linear dependence on 1/F in the region from 1/F = 1 to 1/F = 20 with a narrow width of the melting curve within 0.1 mK. Also, a large gallium triple-point cell was fabricated for the calibration of client-owned CSPRTs. The gallium triple-point cell consists of a PTFE crucible and a PTFE cap with a re-entrant well and a small vent. The PTFE cell contains 780 g of gallium from the same source as used for the small glass cell. The PTFE cell is completely covered by a stainless-steel jacket with a valve to enable evacuation of the cell. The melting curve of the large cell shows a flat plateau that remains within 0.03 mK over 10 days and that is reproducible within 0.05 mK over 8 months. The calibrated value of a CSPRT obtained using the large cell agrees with that obtained using the small glass cell within the uncertainties of the calibrations.

Keywords

Gallium ITS-90 Triple point 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.National Metrology Institute of Japan, AISTTsukubaJapan

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