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New ternary intermetallics RE5Ru3Al2 (RE = La, Ce, Pr): Synthesis, crystal structures, magnetic and electric propertiesстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Murashova E.V., Tursina A.I., Bukhanko N.G., Nesterenko S.N., Kurenbaeva Zh M., Seropegin Y.D., Noel H., Potel M., Roisnel T., Kaczorowski D.
- Журнал: Materials Research Bulletin
- Том: 45
- Номер: 8
- Год издания: 2010
- Издательство: Pergamon Press Ltd.
- Местоположение издательства: United Kingdom
- Первая страница: 993
- Последняя страница: 999
- DOI: 10.1016/j.materresbull.2010.04.006
- Аннотация: Intermetallics RE5Ru3Al2 (RE = La, Ce, Pr) were prepared by arc melting of the elemental components with subsequent annealing at 820 K. The crystal structures were determined from single-crystal (Ce5Ru3Al2, Pr5Ru3Al2) and powder (La5Ru3Al2) X-ray diffraction at room temperature. The compounds belong to new structural types: space group R3, Z = 6, a = 13.9270(3) angstrom, c = 8.3260(2) angstrom for Ce5Ru3Al2 and space group I2(1)3, Z = 4, a = 9.95419(6) angstrom and 9.8084(3) angstrom for La5Ru3Al2 and Pr5Ru3Al2, respectively. The trigonal structure of Ce5Ru3Al2 is a distorted variant of the cubic La5Ru3Al2 and Pr5Ru3Al2 structures. An interesting feature of the Ce5Ru3Al2 are the short (2.5299(16) angstrom and 2.5969(15) angstrom) Ce-Ru distances. Magnetic measurements revealed the Pauli paramagnetic behavior in La5Ru3Al2 and the Curie-Weiss paramagnetism in Pr5Ru3Al2. The latter compound likely exhibits a kind of magnetically ordered state below 24 K. In turn, Ce5Ru3Al2 remains paramagnetic down to 4.2 K and shows signs of mixed valence states of Ce ions. Electrical resistivity measurements indicated simple metallic conductivity in La5Ru3Al2 and Pr5Ru3Al2, and a more complex metallic behavior in Ce5Ru3Al2. (C) 2010 Elsevier Ltd. All rights reserved.
- Добавил в систему: Серопегин Юрий Дмитриевич