Crystallographic and 119Sn and 155Gd Mössbauer analyses of Gd5Ge2(Si1 − xSnx)2 (x = 0.23 and x = 0.40)
| Autor: | J.C.P. Campoy, Lisandro Pavie Cardoso, A.O. dos Santos, M. T. Raposo, Andrea Paesano, José Domingos Fabris |
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| Rok vydání: | 2009 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Mössbauer effect Rietveld refinement Transition temperature Crystal structure Condensed Matter Physics Atomic and Molecular Physics and Optics Crystallography Phase (matter) Mössbauer spectroscopy X-ray crystallography Curie temperature Physical and Theoretical Chemistry |
| Zdroj: | Hyperfine Interactions. 195:191-197 |
| ISSN: | 1572-9540 0304-3843 |
| DOI: | 10.1007/s10751-009-0119-1 |
| Popis: | 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 Mossbauer 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. Mossbauer results are well consistent with the proposed crystallographic models for these systems. |
| Databáze: | OpenAIRE |
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