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Realization of the Gallium Triple Point at NMIJ/AIST

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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.

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  1. National Metrology Institute of Japan, AIST, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan

    T. Nakano, O. Tamura & H. Sakurai

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  1. T. Nakano
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  2. O. Tamura
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  3. H. Sakurai
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Correspondence to T. Nakano.

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Nakano, T., Tamura, O. & Sakurai, H. Realization of the Gallium Triple Point at NMIJ/AIST. Int J Thermophys 29, 112–118 (2008). https://doi.org/10.1007/s10765-007-0359-8

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  • DOI: https://doi.org/10.1007/s10765-007-0359-8

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