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Mechanical Amorphization and Recrystallization of Mn-Co(Fe)-Ge(Si) Compositions

Authors :
Universidad de Sevilla. Departamento de Física de la Materia Condensada
Vidal Crespo, Antonio
Ipus Bados, Jhon Jairo
Blázquez Gámez, Javier Sebastián
Conde Amiano, Alejandro
Universidad de Sevilla. Departamento de Física de la Materia Condensada
Vidal Crespo, Antonio
Ipus Bados, Jhon Jairo
Blázquez Gámez, Javier Sebastián
Conde Amiano, Alejandro
Publication Year :
2019

Abstract

Mechanical alloying using a planetary ball mill allowed us to obtain two homogeneous systems formed by units with nanometer size and MnCo0.8Fe0.2Ge1−xSix stoichiometry (x = 0 and 0.5). The phase evolution of the systems with the milling time was analyzed using X-ray diffraction. Thermal stability of the final products was studied using differential scanning calorimetry. Room temperature 57Fe Mössbauer spectroscopy was used to follow the changes in the Fe environments. A paramagnetic Co-based amorphous phase developed in both alloys as milling progressed. However, while the presence of Si stabilized the Mn-type phase, mechanical recrystallization was observed in a Si-free composition leading to the formation of a MnCo(Fe)Ge intermetallic (Pnma space group) with a crystal size of 7 ± 1 nm. Mössbauer results indicate that Fe atoms migrate from the initial bcc phase to the amorphous and intermetallic phases.

Details

Database :
OAIster
Notes :
English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1367135873
Document Type :
Electronic Resource