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Type: Artigo de periódico
Title: Effect of hydrogen on the structural, magnetic and magnetocaloric properties of the Gd5Ge2.1Si1.9 compound
Author: Carvalho, AMG
Alves, CS
Colucci, CC
Bolanho, MA
Coelho, AA
Gama, S
Nascimento, FC
Cardoso, LP
Abstract: The effect of hydrogen absorption (<= 2.50 hydrogen atoms per formula unit) in the Gd5Ge2.1Si1.9) magnetocaloric compound is investigated by magnetic and X-ray diffraction measurements. Room temperature Rietveld refinement shows that even at low hydrogen content in the base sample (1600 degrees C/48 h annealed Gd5Ge2.1Si1.9) an orthorhombic Gd5Si4-type structure is stabilized. The hydrogen absorption: (i) increases a-axis and b-axis and decreases the c-axis parameter; (ii) destroys the first-order magneto-structural transition (magnetization versus temperature data); (iii) decreases the Curie temperature and, (iv) drastically reduces the isothermal variation of entropy (Delta S-T), as expected for this compound when stabilized in the orthorhombic structure. (c) 2006 Elsevier B.V. All rights reserved.
Subject: rare earth alloys and compounds
crystal structure
X-ray diffraction
magnetic measurements
Country: Suíça
Editor: Elsevier Science Sa
Citation: Journal Of Alloys And Compounds. Elsevier Science Sa, v. 432, n. 41671, n. 11, n. 14, 2007.
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2006.05.121
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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