Abstract:
Constitutional investigations of Fe-RE, Co-RE and Fe-Co-RE systems revealed that it requires an "RE" content in excess of (Fe, - xCox)2 RE composition in order to prepare these compounds free from the presence of phases. A comparison of experimental and theoretical densities (calculated from the volumes of the unit cells) showed that the number of vacant TM(TM=Fe, Co or Fe+Co) sites vary from 7.5% for (Fe032 Co0.68)2 Gd to 2.5% in the binary Fe2Gd compound. Likewise, there are 7.1% such sites in (Fe033 C00.67)2 Tb and 3.8% in the binary Co2Tb compound. Thus, it was concluded that the defects in the lattices of these compounds, responsible for the deviation from ideal stoichiometric compositions are vacancies on Fe and Co sites in respective binary compounds and on Fe+Co sites in ternary compounds.
Page(s):
77-82
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Scientific and Industrial Research, Volume: 37, Issue: 3, Year: 1994