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A STUDY OF THE MAGNETIC PROPERTIES OF THE FeTiO$sub 3$-/cap alpha/Fe$sub 2$$O$$sub 3$ SYSTEM BY NEUTRON DIFFRACTION AND THE MOSSBAUER EFFECT

Journal Article · · J. Phys. Soc. Japan
DOI:https://doi.org/10.1143/JPSJ.17.1598· OSTI ID:4752226
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The solid solutions (1-x)FeTiO/sub 3/-xFe/sub 2/O/sub 3/ exhibit strong ferrimagnetic moments in the composition range 0.1 < x < 0.6. In this region cation ordering is thought to occur such that the Fe/sup 2+/ and Ti/sup 4+/ ions occupy alternate (111) layers, thus forming sublattices ASTAxFe/sup 3+/, (1-x)Fe/ sup 2+/! and BSTAxFe/sup 3+/, (1-x)Ti/sup 4+/!. A neutron diffraction study shows that at least 96% of the Ti ions are located on the B layer but that they are not ordered within the layer. The temperature dependence of the magnetic intensities of a number of ferrimagnetic phases reveals that both sublattice moments, at zero magnetic field, fall considerably short of the theoretical values. In addition, Mossbauer patterns indicate that paramagnetic behavior persists over a rather wide temperature range below the Neel temperatures of solid solutions in which x = 0.21 and x = 0.33. These results are interpreted as a consequence of inhomogeneity in the magnetic structure, due to competing interactions as a result of the Ti ions being disordered within the layer. The center shift and quadrupole spli tiing for FeTiO/sub 3/ were measured over a wide temperature range. By using these results, the Mossbauer absorption by solid soluti ons above their Neel points can be interpreted as a superposition of the absorption peaks of Fe/sup 2+/ and Fe/sup 3+/. (auth)
Research Organization:
Westinghouse Central Labs., Pittsburgh
Sponsoring Organization:
USDOE
NSA Number:
NSA-17-004959
OSTI ID:
4752226
Journal Information:
J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 17
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

CONFIGURATION
DIFFRACTION
IONS
IRON
IRON OXIDES
LATTICES
MAGNETIC MOMENTS
MAGNETISM
METALS, CERAMICS, AND OTHER MATERIALS
MOESSBAUER EFFECT
NEUTRONS
NUCLEAR MAGNETIC RESONANCE
SOLID SOLUTIONS
TITANIUM
TITANIUM OXIDES