MAGNETIC HYPERFINE STUDIES OF NEODYMIUM IRON-OXIDES

Authors
TANEJA SP NAKAMURA Y GARG VK HOSOITO N
Citation
Sp. Taneja et al., MAGNETIC HYPERFINE STUDIES OF NEODYMIUM IRON-OXIDES, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 76(1-4), 1993, pp. 127-129
Citations number
4
Categorie Soggetti
Physics, Nuclear","Nuclear Sciences & Tecnology","Instument & Instrumentation
Journal title
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms → ACNP
ISSN journal
0168583X
Volume
76
Issue
1-4
Year of publication
1993
Pages
127 - 129
Database
ISI
SICI code
0168-583X(1993)76:1-4<127:MHSONI>2.0.ZU;2-Z
Abstract
The temperature dependence of the magnetic hyperfine field of neodymiu m-iron mixed oxides has been studied by Fe-57 Mossbauer spectroscopy. Mixed oxides of Nd and Fe in atomic ratios of 1 : 3, 1 : 2, 1 : 1, 2 : 1 and 3 : 1 were annealed at 850, 1000 and 1250-degrees-C. Mossbauer spectra were recorded between 4.2 and 300 K. For a sample of 1 : 1 com position (1000-degrees-C annealed) Mossbauer spectra were also recorde d at high temperatures leading to T(N) congruent-to 660 K. The variati on of internal magnetic field with temperature (1 : 1 composition, 100 0-degrees-C) closely matches with that of NdFeO3 (perovskite) phase. A ll samples of 1 : 1 composition show single six-line spectra, indicati ng one crystallographic site of iron ion. For iron-rich samples, the M ossbauer spectra showed two sextets which correspond to NdFeO3 and alp ha-Fe2O3 phases. These results agree with our X-ray and magnetic susce ptibility studies.