@article{oai:repo.qst.go.jp:00047962,
 author = {齋藤, 寛之 and 町田, 晃彦 and Sugimoto, Hidehiko and Yagi, Takehiko and 青木, 勝敏 and 齋藤 寛之 and 町田 晃彦 and 青木 勝敏},
 issue = {5},
 journal = {Journal of Alloys and Compounds},
 month = {Mar},
 note = {We have measured the volumes of dhcp- and fcc-FeHx at temperatures of 300–950 K and hydrogen  pressures of 4–7 GPa using in situ X-ray diffraction. For dhcp-FeHx, slight reduction in volume starting at around 500 K on heating was observed in the V–T relations. This is likely related to magnetic transition.  For fcc-FeHx, the expanded volumes per Fe atom with respect to fcc-Fe metal were converted to hydrogen compositions x using hydrogen-induced volume pansion vH. A miscibility ｇap in the x–T diagram of fcc-FeHx was confirmed to be in agreement with an earlier study, and the critical pressure was located in a rather narrow span of 4.0–4.5 GPa with a critical composition of x = ~0.4. We xamined Arrhenius plot analysis of the x–T relations to derive the enthalpy of  solution of hydrogen delta-Hs. However, an irregular behavior of the x–T relations did not allow  derivation of a reliable value of delta-Hs.},
 pages = {520--525},
 title = {P-V-T relation of the Fe-H system under hydrogen pressure of several gigapascals},
 volume = {706},
 year = {2017}
}