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phases

Title phases
Publication TypeJournal Article
Year of Publication2018
AuthorsManfrinetti, P, Provino, A, Sangeetha, NS, Dhar, SK
JournalJournal of Materials Chemistry C
Volume6
Pagination5250-5260
Date Published05
Type of ArticleArticle
ISBN Number2050-7526
Accession NumberWOS:000432599600019
Keywordscompounds r, dy, er, Intermetallic compounds, Materials Science, palladium, pd system, physics, rare-earths, system, tb, thermodynamic assessment, tm
Abstract

perature phase. These compounds crystallize in the monoclinic Sm10Pd21-type (mS124-C2/m, No. 12, Z = 4); the lattice parameters and unit cell volume decrease linearly on going from Pr to Lu in agreement with the lanthanide contraction. The crystal structure has been determined by X-ray powder diffraction and refined by Rietveld method for the Y, Nd, Tb and Lu compounds. These phases form by a peritectic reaction; the formation temperature, T-f, of some of them has also been measured and compared with the values reported for the RPd2 phases for which the literature data are available. The increase of both the volume contraction and T-f on going from Pr10Pd21 to Lu10Pd21 suggests an increase of the thermodynamic stability along the series from the lighter to the heavier R. Physical properties (heat capacity, magnetic susceptibility and magnetization, electrical resistivity and magnetoresistance) have been measured for some members of the series (Nd10Pd21, Gd10Pd21, Tb10Pd21, Dy10Pd21, Ho10Pd21, Lu10Pd21 and Y10Pd21). Antiferromagnetic ordering is found for compounds with magnetic R ions at low temperature; the highest Neel temperature, T-N, is 10 K for Tb10Pd21. The present experimental work represents a valuable contribution towards a more complete knowledge of the R-Pd systems. In the light of these results, all the binary R-Pd phase diagrams have to be reinvestigated (mainly those based on data assessed by the CALPHAD technique, using optimized thermodynamic parameters) and updated to furnish the material scientists consistent information to challenge the study of more complex systems.

DOI10.1039/c8tc00160j
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