ISSN:
1089-7550
Quelle:
AIP Digital Archive
Thema:
Physik
Notizen:
Nanometer-sized magnetic materials have attracted a lot of attention because of their potential applications in the fields of ferrofluids, high density magnetic recording, and magnetic refrigeration. The sol-gel method has been considered to be effective for creating dispersions of small metal particles in nonmetallic materials. In this work, nanometer-sized Fe-N compound particles were prepared by nitrogenating the iron-boron oxide glass powders, which were synthesized by the sol-gel method from ethylene glycol gel. The magnetic properties of nanometer-sized iron nitride were measured by a vibrating sample magnetometer (VSM). The specific magnetic moment σ is equal to 132 emu/g and the coercivity Hc is 150 Oe. The phase composition was determined by using an x-ray diffractometer (XRD). The diffraction pattern shows that the sample consisted of a main phase of Fe4N and a small α-Fe phase. The crystallite size d of the Fe4N particles was estimated by Scherrer's formula, and is about 12 nm. The nanometer-sized Fe-N compound was also studied by using Mossbauer spectroscopy. The Mossbauer absorption pattern consisted of a ferromagnetic component superimposed on a superparamagnetic doublet. The ratio of superparamagnetic fraction to ferromagnetic is about 13%. It is shown that the sol-gel technique could be used to prepare ultrafine particles of Fe-N compound.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1063/1.358204
