Electric and magnetic properties; Mossbauer spectroscopy
Abstract :
[en] Ln4FeGa12, where Ln is Y, Tb, Dy, Ho, and Er, prepared by flux growth, crystallize with the cubic Y4PdGa12 structure with the space group and with a = 8.5650(4), 8.5610(4), 8.5350(3), 8.5080(3), and 8.4720(4) Å, respectively. The crystal structure consists of an iron-gallium octahedra and face sharing rare-earth cuboctahedra of the Au3Cu type. Y4FeGa12 exhibits weak itinerant ferromagnetism below 36 K. In contrast, Tb4FeGa12, Dy4FeGa12, Ho4FeGa12, and Er4FeGa12 order antiferromagnetically with maxima in the molar magnetic susceptibilities at 26, 18.5, 9, and 6 K. All the compounds exhibit metallic electric resistivity and their iron-57 Mössbauer spectra, obtained between 4.2 and 295 K, exhibit a single-line absorption with a 4.2 K isomer shift of ca. 0.50 mm/s, a shift that is characteristic of iron in an iron-gallium intermetallic compound. A small but significant broadening in the spectral absorption line width is observed for Y4FeGa12 below 40 K and results from the small hyperfine field arising from its spin-polarized itinerant electrons
Disciplines :
Physics
Author, co-author :
Drake, B. L.; Louisiana State University
Grandjean, Fernande ; Université de Liège - ULiège > Département de physique > Département de physique
Okudzeto, E. K.; Louisiana State University > Chemistry
Karki, A. B.; Louisiana State University > Physics
Sougrati, Moulay T.; Université de Liège - ULiège > Physique
Young, David P.; Louisiana State University > Physics
Long, Gary J.; Missouri University of Science and Technology > Chemistry
Chan, Julia Y.; Louisiana State University > Chemistry
Language :
English
Title :
Crystal Growth, Transport, and the Structural and Magnetic Properties of Ln4FeGa12 with Ln = Y, Tb, Dy, Ho, and Er
Publication date :
2010
Journal title :
Inorganic Chemistry
ISSN :
0020-1669
eISSN :
1520-510X
Publisher :
American Chemical Society, Washington, United States - District of Columbia
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