Abstract
New sealed cells have been developed at the National Metrology Institute of Japan (NMIJ), which are used for realization of the cryogenic fixed points of the International Temperature Scale of 1990. A metal O‐ring made of stainless steel is introduced as a sealing device for the sealed cells. The triple point of equilibrium hydrogen (e‐H2) is realized using the new sealed cells containing hydrogen and ferric oxy‐hydroxide as a catalyst for the ortho‐para equilibration. Double anomalous peaks on the heat capacity curves are observed at temperatures just below the triple point, but they are suppressed by reducing the amount of the catalyst. The reduction of the amount of catalyst allows one to obtain more reliable melting curves for e‐H2. The triple‐point temperature of e‐H2 obtained by the new sealed cells is in good agreement with those reported previously in measurements of open cells by assuming that the dependence of the triple‐point temperature on the deuterium content is 5.4 μK per ppm of deuterium i...
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