MAGNETIC MEASUREMENTS AND TRANSMISSION ELECTRON-MICROSCOPY INVESTIGATIONS ON FE-CO ULTRAFINE POWDERS DERIVED FROM A BIMETALLIC CARBONYL CLUSTER

Authors
PREDIERI G PARETI L SOLZI M ARMIGLIATO A BIGI S
Citation
G. Predieri et al., MAGNETIC MEASUREMENTS AND TRANSMISSION ELECTRON-MICROSCOPY INVESTIGATIONS ON FE-CO ULTRAFINE POWDERS DERIVED FROM A BIMETALLIC CARBONYL CLUSTER, Journal of materials chemistry, 4(2), 1994, pp. 361-364
Citations number
15
Categorie Soggetti
Chemistry Physical","Material Science
Journal title
Journal of materials chemistry → ACNP
ISSN journal
09599428
Volume
4
Issue
2
Year of publication
1994
Pages
361 - 364
Database
ISI
SICI code
0959-9428(1994)4:2<361:MMATEI>2.0.ZU;2-X
Abstract
The molecular carbonyl cluster HFeCo3(CO)12 (1) affords an ultrafine F e-Co powder by thermal treatment under inert atmosphere. Several magne tic or magneto-structural transformations have been evidenced by therm omagnetic analysis (TMA) from 20 to 950-degrees-C. Transmission electr on microscopy (TEM) investigations on samples treated at an intermedia te temperature showed the presence of both mono- and bi-metallic cryst allites of nanometric size. The saturation magnetization was found to increase with increasing annealing temperature, while the opposite beh aviour was found for coercitivity. A comparison was made with the magn etic properties of the cast FeCo3 alloy.