The Effect of Argon Content on the βγ Transition of Oxygen

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As part of a larger project regarding the determination of argon content in oxygen based on measurements of the αβ solid–solid transition temperature of oxygen at 23.8 K, also the effect of argon on the βγ solid–solid transition temperature at 43.8 K was measured. This transition being the main item of interest of these studies (correction of the O2 triple point temperature for argon content), the results obtained on the βγ transition for two argon-in-oxygen mixtures (1002.29·10−6 and 351.14·10−6 mol·Ar·per·mol·O2) are presented here. A preliminary result from the first mixture, already included in a former publication, is combined with the present results for both mixtures to obtain an accurate value for the sensitivity of the temperature of the βγ transition to argon content, along with a discussion regarding the effect of argon on the shape of the O2 transitions.

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Correspondence to Peter P. M. Steur.

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Selected Papers of the 14th International Symposium on Temperature and Thermal Measurements in Industry and Science.

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Steur, P.P.M., Yang, I. & Pavese, F. The Effect of Argon Content on the βγ Transition of Oxygen. Int J Thermophys 41, 7 (2020).

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  • Argon dependence
  • Oxygen
  • Solid–solid transition
  • Temperature