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Journal of Alloys and Compounds, Volume 551, 25 February 2013, Pages 30-36
A. Allam, P. Boulet, C.A. Nunes, J. Sopousek, P. Broz, M.-C. Record
MADIREL, UMR 7246 CNRS – Université Aix-Marseille, av Normandie-Niemen, 13397 Marseille Cedex 20, France
IM2NP, UMR 7334 CNRS – Université Aix-Marseille, av Normandie-Niemen, Case 142, 13397 Marseille Cedex 20, France
Departamento de Engenharia de Materiais (DEMAR), Escola de Engenharia de Lorena (EEL), Universidade de São Paulo (USP), Caixa Postal 116, 12600-970 Lorena, São Paulo, Brazil
Masaryk University, Faculty of Science, Department of Chemistry, Kolarska 2, 611 37 Brno, Czech Republic
Masaryk University, Central European Institute of Technology, CEITEC, Kamenice 753/5, 625 00 Brno, Czech Republic
Abstract
This work is an investigation of the phase transformations of the Higher Manganese Silicides in the temperature range [100–1200 °C]. Several complementary experimental techniques were used, namely in situ X-ray Diffraction (XRD), Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC). The evolution of both the lattice parameters and the thermal expansion coefficients was determined from in situ XRD measurements. The stability of the samples was investigated by thermal analysis (DTA) and Cp measurements (DSC). This study shows that Mn27Si47 which is the stable phase at room temperature and under atmospheric pressure undergoes a phase transformation at around 800 °C. Mn27Si47is transformed into Mn15Si26. This phase transformation seems to be of a second order one. Indeed it was not evidenced by DTA and by contrast it appears on the Cp curve.
