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|Type:||Artigo de periódico|
|Title:||Crystallographic And 119sn And 155gd Mössbauer Analyses Of Gd5ge2(si1 - Xsnx)2 (x = 0.23 And X = 0.40)|
dos Santos A.O.
Paesano Jr. A.
|Abstract:||We report the structural characterization of Gd5Ge2(Si1 - xSnx)2 (x = 0. 23 and x = 0. 40) compounds by means of 100 and 298 K-X-ray diffractometry (XRD) and 4 K-155Gd and 298 K-119Sn Mössbauer spectroscopy. These compounds order ferromagnetically at 218. 4 and 172. 7 K, respectively. At ∼100 K, it was identified the Gd5Si4-orthorhombic phase (type I) for both samples. At ∼298 K, it was identified a Gd5Si2Ge2-monoclinic phase, for x = 0. 23 and a Sm5Sn4-orthorhombic phase (type II), for x = 0. 40. The Rietveld analysis of XRD data suggests a first order magneto-structural transition at Curie temperature for both compositions. Mössbauer results are well consistent with the proposed crystallographic models for these systems. © Springer Science + Business Media B.V. 2009.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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