Mössbauer Studies on Hyperfine Interactions in Titanium Substituted Lithium Ferrites

Kishan, Pran; Prakash, Chandra; Baijal, J. S.; Laroia, K K

doi:10.1002/pssa.2210840224

Cited by 21 publications

(6 citation statements)

References 14 publications

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“…The diamagnetic spectrum of the spinel with x"1.39 shows the same asymmetric line shape as recorded by Kishan et al (12) for a sample with x"1.2 (12). A weak shoulder on the high velocity side of the absorption line can be recognized.…”

Section: Mo¨ssbauer Spectroscopymentioning

confidence: 53%

“…The point symmetry of the (8c) site of the space group P4 32 is only 0.3 and an electric field gradient may arise, resulting in a quadrupolar split doublet (23). authors (5,12,13,24). However, the precision of these data, especially of compounds with high titanium content, has remained poor.…”

Section: Mo¨ssbauer Spectroscopymentioning

confidence: 96%

“…Concerning the x"1.2 spinel, it was argued that in spinels the cubic point symmetry of the tetrahedral site is maintained (12). With regard to the ordered compounds with compositions between x"1.39 and 1.56 this argument cannot be used.…”

Section: Mo¨ssbauer Spectroscopymentioning

confidence: 97%

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Cation Distribution in Ordered Spinels of the Li2O–TiO2–Fe2O3System

Scharner

Weppner

Schmid‐Beurmann

1997

Journal of Solid State Chemistry

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Section: Mo¨ssbauer Spectroscopymentioning

confidence: 53%

Section: Mo¨ssbauer Spectroscopymentioning

confidence: 96%

See 1 more Smart Citation

Cation Distribution in Ordered Spinels of the Li2O–TiO2–Fe2O3System

Scharner

Weppner

Schmid‐Beurmann

1997

Journal of Solid State Chemistry

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“…[1,5,6]. Normally, the material is prepared by the conventional ceramic double sintering method in which solid state reactions between oxides and/or carbonates of Li, Fe(III) and Ti(IV) require prolonged heat exposure at elevated temperatures (typically ∼1200ºC) [1,7,8]. One of the disadvantages of high temperature sintering is the volatility of Li 2 O and the irreversible reduction of Fe 3+ to Fe 2+ with the consequent precipitation of α-Fe 2 O 3 and…”

Section: Introductionmentioning

confidence: 99%

The influence of TiO2 polymorph, mechanical milling and subsequent sintering on the formation of Ti-substituted spinel-related Li0.5Fe2.5O4

2006

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Single-phased spinel-related titanium-substituted Li 0.5 Fe 2.5 O 4 has been synthesized by sintering in air a mechanically pre-milled mixture of lithium carbonate, corundum-related iron (III) oxide and the rutile polymorph of titanium (IV) oxide at 700ºC (12h). This temperature is ca. 450-500ºC less than the temperatures at which the material is normally prepared by conventional ceramic techniques. On replacing the rutile polymorph of titanium (IV) oxide in the pre-milled mixture by the anatase form the formation of single-phased titanium substituted Li 0.5 Fe 2.5 O 4 was not achieved even after sintering the mixture at 1000 o C (12h).2

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“…6,[30][31][32] The replacement of Ti 4+ ions by Ni 2+ ions in the above system leads to the migration of Fe 3+ ions from B-sites to A-sites, i.e., electrical resistivity is increased for x = 0.2, 0.4, and 0.6, while at x = 0.8 is decreased, may be attributed to the conduction through reaction (Eq. (4)).…”

Section: Composition Dependencementioning

confidence: 93%

EFFECT OF Ni ON THE ELECTRICAL AND MICROSTRUCTURAL PROPERTIES OF NANOCRYSTALLITES Fe₂O₃/TiO₂ SYSTEM

Sobhy

2006

Surf. Rev. Lett.

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Nominal compositions of NixTi 1−x Fe 2 O 5−δ (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) were prepared by a solid state reaction using stoichiometric amounts of Fe 2 O 3 /TiO 2 system and NiO as a dopant. The effects of small substitution of Ni ions on the electrical and structural properties were studied for the above system. The X-ray diffraction patterns revealed that the ferroelectric phase of iron titanate and the spinel ferrite phase of Ni-ferrite having a single phase at x = 0 and 1, respectively. The substitution of Ni ions increases the average value of lattice constant aav. Solid-solid interaction took place between the ternary oxides at 1200 • C for 4 h yielding a new phase of NiTiO 3 . The presence of the three phases was confirmed by X-ray diffraction technique. The resultant compositions have nanocrystallites with average crystalline size "Dav" in the range 100-300 nm. The DC electrical resistivity ρ, Curie temperature T C and activation energies for electric conduction around T C region increase as Ni ion substitution increases. The ferrite samples have a semiconductor behavior where electrical resistivity ρ decreases on increasing temperature. The activation energy for electrical conduction was affected by both the ratio "ferroelectric/ferrite" and the position of the Curie temperatures in the compositions depending on the (Ni, Ti) to Fe ratio.

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Mössbauer Studies on Hyperfine Interactions in Titanium Substituted Lithium Ferrites

Cited by 21 publications

References 14 publications

Cation Distribution in Ordered Spinels of the Li2O–TiO2–Fe2O3System

Cation Distribution in Ordered Spinels of the Li2O–TiO2–Fe2O3System

The influence of TiO2 polymorph, mechanical milling and subsequent sintering on the formation of Ti-substituted spinel-related Li0.5Fe2.5O4

EFFECT OF Ni ON THE ELECTRICAL AND MICROSTRUCTURAL PROPERTIES OF NANOCRYSTALLITES Fe₂O₃/TiO₂ SYSTEM

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Mössbauer Studies on Hyperfine Interactions in Titanium Substituted Lithium Ferrites

Cited by 21 publications

References 14 publications

Cation Distribution in Ordered Spinels of the Li2O–TiO2–Fe2O3System

Cation Distribution in Ordered Spinels of the Li2O–TiO2–Fe2O3System

The influence of TiO2 polymorph, mechanical milling and subsequent sintering on the formation of Ti-substituted spinel-related Li0.5Fe2.5O4

EFFECT OF Ni ON THE ELECTRICAL AND MICROSTRUCTURAL PROPERTIES OF NANOCRYSTALLITES Fe2O3/TiO2 SYSTEM

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EFFECT OF Ni ON THE ELECTRICAL AND MICROSTRUCTURAL PROPERTIES OF NANOCRYSTALLITES Fe₂O₃/TiO₂ SYSTEM