Double Anomalous Peak in the Heat Capacity Just Below the Triple Point of Staurated e-H2 With FeO(OH)^u1

Published

January 1, 2005

Author(s)

T Nakano, Weston L. Tew, O Tamura, H Sakurai

Abstract

The heat capacity of e-Hd2 with powder ofFeO(OH) used as a catalyst for ortho-para equilibration has been investigated using sealed cells fabricated at the National Institute of Standards and Technology and at the National Metrology Institute of Japan. An anomalous double peak has been observed in their heat capacities at temperatures just below the triple point independent of sources of Hd2 and FeO(OH) and designs of sealed cells. Supercooling behavior has been observed not only at the triple point but also at each anomalous peak resulting from a depression of the melting temperature of a portion of solid Hd2 in close physical proximity to the catalyst. The reduction of the amount of catalyst suppresses the size of the anomalies and allows one to obtain more reliable melting curves for e-Hd2 at the triple point.

Citation

International Journal of Thermophysics

Volume

26 No 1

Pub Type

Journals

Keywords

catalyst, FeO(OH), hydrogen, ITS-90, triple point

Citation

Nakano, T. , Tew, W. , Tamura, O. and Sakurai, H. (2005), Double Anomalous Peak in the Heat Capacity Just Below the Triple Point of Staurated e-H₂ With FeO(OH)^u1, International Journal of Thermophysics (Accessed October 11, 2025)