ISSN:
0741-0581
Keywords:
Composite films
;
Cermet
;
Nano-crystals
;
HREM
;
Nano-diffraction
;
Spinel
;
Phase transformation
;
Gamma-iron
;
Embedded crystallites
;
MgO-matrix Epitaxial growth
;
Magnetic property
;
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Natural Sciences in General
Notes:
Single crystalline composite films of iron and MgO are prepared by a simultaneous vacuum deposition technique. The structures of the composite films, especially of the iron crystallites embedded, are studied by high-resolution electron microscopy and nanometer-area electron diffraction. The α-iron (b.c.c.) crystallites of 1 nm in size are epitaxially embedded in single crystalline MgO films, the orientation being (011)[100]Fe/(001)[100]Mgo and (001)[110]Fe//(001)[100]Mgo. A heat treatment of the as-grown films at 500-1,000°C brings about a phase transformation of the crystallites from α-iron to γ-iron (f.c.c.), followed by a grain growth of α-iron and finally the growth of the spinel, MgFe2O4. The γ-iron crystallites transformed are circular plates and have strains at the periphery to accommodate the surrounding MgO-matrix. The magnetic property of the composite films is also reported.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jemt.1060120310
Permalink
