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Crystals 2016, 6(12), 165; doi:10.3390/cryst6120165

Synthesis, Crystal Structure, and Magnetic Properties of Giant Unit Cell Intermetallics R117Co52+δSn112+γ (R = Y, La, Pr, Nd, Ho)

Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA
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Author to whom correspondence should be addressed.
Academic Editors: Helmut Cölfen and Haidong Zhou
Received: 10 September 2016 / Revised: 7 December 2016 / Accepted: 14 December 2016 / Published: 20 December 2016
(This article belongs to the Special Issue Correlated Electron Crystals)
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Abstract

Ternary intermetallics R117Co52+δSn112+γ (R = Y, La, Pr, Nd, and Ho) have been prepared by arc-melting followed by annealing at 800 °C. All the compounds belong to the Tb117Fe52Ge112 structure type (space group Fm 3 ¯ m) characterized by a complex giant cubic unit cell with a ~ 30 Å. The single-crystal structure determination of Y- and La-containing compounds reveals a significant structural disorder. A comparison of these and earlier reported crystal structures of R117Co52+δSn112+γ suggests that more extensive disorder occurs for structures that contain larger lanthanide atoms. This observation can be explained by the need to maintain optimal bonding interactions as the size of the unit cell increases. Y117Co56Sn115 exhibits weak paramagnetism due to the Co sublattice and does not show magnetic ordering in the 1.8–300 K range. Ho117Co55Sn108 shows ferromagnetic ordering at 10.6 K. Both Pr117Co54Sn112 and Nd117Co54Sn111 exhibit antiferromagnetic ordering at 17 K and 24.7 K, respectively, followed by a spin reorientation transition at lower temperature. View Full-Text
Keywords: intermetallics; crystal structure; giant unit cells; magnetic properties intermetallics; crystal structure; giant unit cells; magnetic properties
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Chai, P.; Abramchuk, M.; Shatruk, M. Synthesis, Crystal Structure, and Magnetic Properties of Giant Unit Cell Intermetallics R117Co52+δSn112+γ (R = Y, La, Pr, Nd, Ho). Crystals 2016, 6, 165.

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