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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|
|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|
|Editor:||Elsevier Science Sa|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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