Preparation and Properties of Mg?Fe Nanocomposite

✍ Scribed by Schneeweiss, O. ;Jir�skov�, Y. ;?ebek, J.

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 86 KB
• Volume: 189
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/1521-396x(200202)189:3<725::aid-pssa725>3.0.co;2-b

✦ Synopsis

The Mg-Fe nanocomposite synthesized by spark erosion of pure Mg and Fe electrodes was investigated by X-ray diffraction, Mo ¨ssbauer spectroscopy and magnetic measurements. From the X-ray diffraction measurements Mg, MgO, and a-Fe were recognized. According to the Mo ¨ssbauer spectra analysis, iron atoms were identified in a-Fe, Fe in Mg/MgO (mf ), and Fe 1--x O phases. The mf phase consists of an amorphous part (paramagnetic down to 20 K), weak ferromagnetic Fe in Mg, and fcc iron clusters (particles) which are antiferromagnetic below T N % 60 K. Measurements of the thermomagnetic curves show spin-glass-like behaviour of the as-prepared powder. Transformation of the mf phase in a-Fe and Fe 1--x O phases was observed after annealing at temperatures above 200 C.