冷凍機を用いたオープンセルによる平衡水素の三重点の実現
2000 年 36 巻 9 号 p. 743-748
詳細
2000 年 36 巻 9 号 p. 743-748
The triple point of equilibrium hydrogen is realized by an open cell method using a closed-cycle helium refrigerator. Abnormality is observed on the heat capacity curves of solid hydrogen at temperatures of about 0.1K below the triple point of equilibrium hydrogen in the case of usage of 2g of activated ferric hydroxide as a catalyst for the ortho- and para-hydrogen's equilibration. No abnormality is, however, observed in the case of 0.2g of a catalyst against about 0.1mol of hydrogen. In the latter case, it takes about 3 days for equilibration of ortho- and para-hydrogen and flat melting curves are obtained.
