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New R3Pd5 Compounds (R = Sc, Y, Gd-Lu): Formation and Stability, Crystal Structure, and Antiferromagnetism

TitleNew R3Pd5 Compounds (R = Sc, Y, Gd-Lu): Formation and Stability, Crystal Structure, and Antiferromagnetism
Publication TypeJournal Article
Year of Publication2016
AuthorsProvino, A, Sangeetha, NS, Dhar, SK, Smetana, V, Gschneidner, KA, Pecharsky, VK, Manfrinetti, P, Mudring, AV
Journal Design
Volume16
Pagination6001-6015
Date Published10
Type of ArticleArticle
ISBN Number1528-7483
Accession NumberWOS:000384952400048
Keywordsalloying behavior, chemistry, Crystallography, equilibria, indium system, Materials Science, palladium system, pd system, phase-diagram, physical-properties, rare-earths, thermodynamic assessment, ytterbium
Abstract

ined from both single crystal (for Tb3Pd5) and powder X-ray diffraction data (for Tb3Pd5, Ho3Pd5, and Tm3Pd5). These ccmpounds represent the first example of a binary phase formed by R and Pd adopting the Pu3Pd5-type featuring two crystallographic nonequivalent sites for the R atoms in the unit cell (the Wyckoff sites 4c and 8e). The variation of the lattice parameters and unit cell volume along the series strictly-follows the trend of the lanthanide contraction. An extrapolation of the volume contraction versus the R3+ ionic radius gives an atomic volume: of 29.74 angstrom(3) for Yb in the hypothetical trivalent metallic state (under normal conditions). The formation temperatures and mechanisms, peritectic reaction, and stability ranges have also been investigated. It turns out that Gd3Pd5 is a high temperature phase; it was not possible to quench this compound as a metastable phase, at room temperature, to be measured. In the light Of our results, most of the R-Pd phase diagrams need to be revised. The magnetization, heat capacity,, and electrical resistivity have been Measured for Tb3Pd5, Dy3Pd5, Ho3Pd5, and Er3Pd5. They order antiferromagnetically at low temperatures, each undergoing two transitions, T-N1 and T-N2 (with T-N1, going from 13.5 to 5.1 K and T-N2 going from 6.5 to 3.6 K, respectively for Tb and Ho compounds). From our data we cannot distinguish: whether the two rare earth sublattices sequentially order magnetically at T-N1 and T-N2, respectively, or whether they are simultaneously involved in both transitions. The electronic structure calculations predict antiferromagnetic ordering also for Gd3Pd5. Y(3)Ed(5) is a Pauli paramagnet.

DOI10.1021/acs.cgd.6b01045
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Alternate JournalCryst. Growth Des.