Hydrogen in Nickel: Hydride or Miscibility Gap?

• Дата: 2013
• Автори: Movchan, D.N., Teus, S.M., Mogilny, G.S., Gavriljuk, V.G.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут металофізики ім. Г.В. Курдюмова НАН України 2013
• Назва видання: Металлофизика и новейшие технологии
• Теми: Фазовые превращения
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/104132
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Hydrogen in Nickel: Hydride or Miscibility Gap? / D.N. Movchan, S.M. Teus, G.S. Mogilny, V.G. Gavriljuk // Металлофизика и новейшие технологии. — 2013. — Т. 35, № 6. — С. 821-829. — Бібліогр.: 20 назв. — англ.

Using low temperature X-ray diffraction, the phase transformations in the hydrogen-saturated nickel are studied. At the hydrogen degassing, its content in nickel decreases down to H/M ratio of about 0.65. The further decreasing of hydrogen content leads to the two-phase separation, notably, hydrogen-rich and hydrogen-depleted solid solutions with permanent hydrogen concentrations existing while the hydrogen-rich phase does not disappear. Based on the Gibbs’ idea about two types of precipitation reactions and available experimental data, it is concluded that, in fact, the so-called Ni-hydride is a hydrogen-rich solid solution, which appears because of miscibility gap in the Ni—H system. At higher hydrogen contents beyond the crown, hydrogenrich phase exists in the wide concentration range as a supersaturated hydrogen solid solution in nickel, which is also incorrectly interpreted as Nihydride.