MOSSBAUER STUDIES AND CORRELATION OF COERCIVITY WITH PARTICLE MORPHOLOGY IN FE SIO2 AND FE/BN GRANULAR SOLIDS/

Authors
HADJIPANAYIS GC TSOUKATOS A PAPAEFTHYMIOU V SIMOPOULOS A KOSTIKAS A
Citation
Gc. Hadjipanayis et al., MOSSBAUER STUDIES AND CORRELATION OF COERCIVITY WITH PARTICLE MORPHOLOGY IN FE SIO2 AND FE/BN GRANULAR SOLIDS/, Scripta metallurgica et materialia, 33(10-11), 1995, pp. 1679-1686
Citations number
21
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
Journal title
Scripta metallurgica et materialia → ACNP
ISSN journal
0956716X
Volume
33
Issue
10-11
Year of publication
1995
Pages
1679 - 1686
Database
ISI
SICI code
0956-716X(1995)33:10-11<1679:MSACOC>2.0.ZU;2-E
Abstract
Large differences have been observed in the coercivity values of Fe/Si O2 and Fe/BN granular films with the coercivities being much lower in the BN matrix. We have used Mossbauer spectroscopy in an attempt to un derstand the differences in the magnetic hysteresis behavior. The Moss bauer data suggest a core/shell morphology for the Fe/SiO2 films with an Fe(Fe-Si) core surrounded by an Fe-Si-O shell whose surface consist s of Fe2+-Si-O grains. In Fe/BN the data indicate the presence of amor phous Fe-B particles in a BN matrix. This hypothesized particle morpho logy can explain the high coercivity values in SiO2 films and the low H-c in BN because of the low anisotropy of the amorphous phase.