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The influence of crystal electric field on thermal properties of non-stoichiometric ErB50 boride at low temperatures

TitleThe influence of crystal electric field on thermal properties of non-stoichiometric ErB50 boride at low temperatures
Publication TypeJournal Article
Year of Publication2016
AuthorsNovikov, VV, Zhemoedov, NA, Matovnikov, AV, Mitroshenkov, NV, Ueland, BG, Bud'ko, SL
JournalJournal of Alloys and Compounds
Volume684
Pagination714-718
Date Published11
Type of ArticleArticle
ISBN Number0925-8388
Accession NumberWOS:000379792800099
Keywordsanomalies, capacity, chemistry, conductivity, Crystal and ligand fields, expansion, functions, heat, heat-capacity, lattice-dynamics, Materials Science, Metallurgical Engineering, neodymium hexaboride, potentials, range 5-300 k, Rare earth alloys and compounds, rare-earth hexaborides, Thermal expansion, thermodynamic, X-ray diffraction
Abstract

The temperature dependences of heat capacity, C-p(T), and lattice parameters, a(T), b(T), c(T), of ErB50 in the temperature range of 2-300 K were experimentally studied. Two features in C-p(T) were observed: a maximum at T-m1 = 3.12 K, that is associated with a magnetic ordering (transition to an antiferromagnetic state), and a broad anomaly at about T-m2 = 27 K that is due to the effects of the crystal electric field (CEF) on the boride heat capacity. Based on these data a scheme of splitting of Er3+ ions f-levels by the crystal field was suggested. Comparison of the temperature dependence of unit cell volume V(T) for ErB50 with the literature data for LuB50 revealed an excess contribution into the thermal expansion of erbium boride at low temperatures. It was determined that this contribution is due to the CEF effects on ErB50 thermal expansion. (C) 2016 Elsevier B.V. All rights reserved.

DOI10.1016/j.jallcom.2016.05.113
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Complex States

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Correlations

Alternate JournalJ. Alloy. Compd.