Open AccessВлияние гидрирования на структуру, магнитные и магнитокалоричеcкие свойства сплавов Tb-Dy-Co со структурой фаз Лавеса
Author(s) -
И.С. Терёшина,
Т.П. Каминская,
V. B. Chzhan,
Ю.А. Овченкова,
А.С. Трушева,
А.А. Вирюс
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.07.47829.417
Subject(s) - magnetic refrigeration , materials science , magnetostriction , magnetic moment , hydride , paramagnetism , curie temperature , crystal structure , hydrogen , crystallography , condensed matter physics , cobalt , ferromagnetism , chemistry , magnetization , magnetic field , metallurgy , physics , organic chemistry , metal , quantum mechanics
A comprehensive study of the structure, phase composition, surface topology, magnetic and magnetocaloric properties of the compounds TbCo2, Tb0.3Dy0.7Co2 and the hydride with a low hydrogen content Tb0.3Dy0.7Co2H0.5 was carried out. The features of the structure at the micro- and nano- levels, as well as changes in the fundamental and functional properties during hydrogenation, were established. It was shown that the introduction of a small amount of hydrogen into the crystal lattice of the Tb0.3Dy0.7Co2 compound leads to an increase in both the Curie temperature and the magnetic moment on the cobalt atoms. The type of magnetic phase transition from a paramagnetic to a magnetically ordered state changes from the first (in the compound Tb0.3Dy0.7Co2) to the second (in TbCo2, Tb0.3Dy0.7Co2H0.5), which leads to a significant decrease in the magnitude of the magnetocaloric effect.