Moessbauer characterization of [gamma]-FeSi[sub 2] precipitates in Si(100)
- Departamento de Fisica, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo No. 67, (1900) La Plata (Argentina)
- Centre de Spectrometrie Nucleaire et Spectrometrie de Masse, 91405 Orsay Campus (France)
- Materials Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
Metastable [gamma]-FeSi[sub 2] fluorite-type was formed as precipitates in Si(100) by room-temperature [sup 57]Fe implantation, followed by ion-beam-induced epitaxial crystallization at 593 K. In spite of the cubic structure of [gamma]-FeSi[sub 2], the Moessbauer spectrum consists of two broad lines, rather than a single line. It is best described by means of a smooth distribution of electric field gradients with nearly the same isomer shift ([delta][sub IS]=0.198 mm/s) for each gradient. After thermal treatments at 773 K the distribution narrows and a finite probability occurrence frequency for zero gradient appears. As the structure of ideal [gamma]-FeSi[sub 2] consists of Si cubes alternately filled with Fe atoms, it is suggested that the distribution arises from misplacement of Fe atoms to empty Si cubes in the lattice. The dependence with thermal treatments and the evolution towards [beta]-FeSi[sub 2] are discussed.
- OSTI ID:
- 7082738
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:1; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
Similar Records
Site location of Co in {beta}-FeSi{sub 2}
M{umlt o}ssbauer study of the magnetic character and ordering process of the cubic {gamma}-FeSi{sub 2} phase obtained by Fe implantation into a Si(100) matrix
Related Subjects
360602* -- Other Materials-- Structure & Phase Studies
ANNEALING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELECTRIC FIELDS
ELEMENTS
HEAT TREATMENTS
ION IMPLANTATION
IRON COMPOUNDS
IRON SILICIDES
MOESSBAUER EFFECT
PRECIPITATION
SEMIMETALS
SEPARATION PROCESSES
SILICIDES
SILICON
SILICON COMPOUNDS
TEMPERATURE RANGE
TEMPERATURE RANGE 0013-0065 K
TRANSITION ELEMENT COMPOUNDS