Structural and magnetic properties of mechanically alloyed AlCuFe intermetallics

LUIS MENDOZA ZELIS; MARCOS MEYER; FRANCISCO SANCHEZ

Physics Statu Solidi

Willey-VCH

Lugar: Berlin; Año: 2005 vol. 2 p. 3581 - 3584

1610-1634

We present here a study of the structural and magnetic properties of a series of mechanically alloyed intermetallics around a central composition Al50Cu20Fe30, varying the Cu and Fe content. All the samples have bcc crystalline structure with partial B2 order and show no evidence of a magnetic splitting in the Mössbauer spectra. Thermal annealing, removes some defects but do not change this structural feature. All the studied alloys show, at room temperature, a hysteresis loop that may be interpreted in terms of two magnetic components coming respectively from superparamagnetic and ferromagnetic-like regions. The parameters characterizing the magnetic properties change with composition but no systematic behavior could be deduced.