Рентгеновские, мёссбауэровские и магнитокалорические исследования многокомпонентных сплавов Tb-Dy-Ho-Co-Fe

Чжан, В.Б.; Терёшина, И.С.; Бурханов, Г.С.; Илюшин, А.С.; Дудкин, Д.С.; Карпенков, А.Ю.; Киселева, Т.Ю.; Русаков, В.С.

Авторы: Чжан В.Б., Терёшина И.С., Бурханов Г.С., Илюшин А.С., Дудкин Д.С., Карпенков А.Ю., Киселева Т.Ю., Русаков В.С.
Сборник: Сборник материалов VI Международной конференции с элементами научной школы для молодежи "Функциональные наноматериалы и высокочистые вещества"
Тезисы
Год издания: 2016
Место издания: ИМЕТ РАН Москва
Первая страница: 53
Последняя страница: 54
Аннотация: In the present work, a search for new materials with a large magnetocaloric effect (MCE) was carried out among the multicomponent RCo2-type compounds. Alloys with substitution in rare-earth sublattice Tbx(Dy0.5Ho0.5)1-xCo2 (х=0.3, 0.4 и 0.5) and, additionally, with substitution in cobalt sublattice Tbx(Dy0.5Ho0.5)1-xCo1.75Fe0.25 were prepared by arc-melting using the high purity metals. The measurements of the MCE were performed by direct method in wide temperature range. 57Fe MÖssbauer effect studies were performed for intermetallic Tb0.3Dy0.35Ho0.35Co1.75Fe0.25. Spectra characteristic of the easy axis of magnetization were fitted, assuming the random distribution of the Fe/Co atoms in the transition metal sublattice. The Curie temperature of these compounds does not exceed 150-170 K. For a practical applications, it is important to shift the transition temperature to climatic temperatures region. For this purpose we have been done on substitution of cobalt for Al atoms. As a result, small dope of Fe was able to raise the transition temperature to room temperature, however the value of the MCE is reduced. Nonetheless, the increase in the Curie temperature and distinct broadening the paramagnetic-ferrimagnetic phase transition, which were found upon Fe-doping of this compounds give an opportunity to use such materials in practice.
Добавил в систему: Терёшина Ирина Семёновна

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