The preparation and properties of some vanadium spinels

Rogers, Donald B.; Arnott, R. J.; Wold, A.; Goodenough, John B.

doi:10.1016/0022-3697(63)90193-8

Cited by 180 publications

(73 citation statements)

References 17 publications

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“…The pellets were sintered at 1050°C for 40 h with a regrinding in the middle. The X-ray diffraction measurement indicates that the asprepared sample is a single spinel phase with a lattice constant of 0.8346 nm which is consistent with literature [5]. Scanning electron microscope (SEM) images show that the sample is porous with an average grain size of several micrometers (inset of Figure 2(c)).…”

Section: Methodssupporting

confidence: 87%

Dielectric properties of spinel ceramic Fe1.8V1.2O4

2012

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Spinel vanadates possess rich physics arising from the interaction among spin, orbital and lattice degrees of freedom. We report the dielectric properties of polycrystalline Fe 1.8 V 1.2 O 4 . A thermally activated dielectric relaxation appeared in low temperature due to the inhomogeneous conductivity between grains and grain boundaries. We found an artificial ferroelecticity in this sample. An abnormal frequency-independent dielectric peak appeared at room temperature when the samples were measured during warming in ambient air. However, this peak disappeared in the following cooling process. By dielectric frequency spectrum and equivalent circuit analysis in detail, we found the sample had a surface layer in warming but not in cooling process. We also confirmed that this surface layer was induced by the adsorption of water, which is responsible for the dielectric peak. system. The present paper studied the temperature and frequency dependent dielectric property of the Fe 1.8 V 1.2 O 4 polycrystalline. We observed a dielectric relaxation in a low temperature range and a frequency independent dielectric peak in a high temperature range.

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Section: Methodssupporting

confidence: 87%

Dielectric properties of spinel ceramic Fe1.8V1.2O4

2012

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“…The other possible factors for suppression of the LTO phase by the substitution are the change in ionic sizes and that in valence states. In the vanadium spinel oxides, it is well known that the bond length between vanadium ions V-V is strongly related with the localized-itinerant electronic transition, e.g., enhancement of the ferrimagnetic transition and suppression of the structural distortion [35][36][37]. In this study, when the ionic sizes of Fe 2+ and V 3+ ions are changed by the substitution of the Mn 2+ and Fe 3+ ions, respectively, the V-V lengths also change.…”

Section: Orbitally Diluted Materialsmentioning

confidence: 72%

Orthorhombic distortion and orbital order in the vanadium spinelFeV2O4

et al. 2016

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Using synchrotron and neutron diffraction measurements, we find a low-temperature orthorhombic phase in vanadium spinel FeV 2 O 4 . The orbital order of V 3+ ions with tetragonal normal modes occurs at 68 K, and this leads to an appearance of the pseudotetragonal phase at a noncollinear ferrimagnetic transition temperature. Below the magnetic transition temperature, unconventional behavior of the orbital state of Fe 2+ ions accompanied by the emergence of the orthorhombic phase was observed by using the normal mode analysis. We have also studied the structural properties of orbitally diluted materials. The orthorhombic phase, which is significantly affected by the other ions, is intrinsic in FeV 2 O 4 . We suggest the orthorhombic phase is strongly related with the double orbital states of Fe 2+ and V 3+ ions.

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“…This sample also shows no OO transition due to the fact that it is approaching the itinerant electron behavior with the small V-V distance. In the AV 2 O 4 system, this increased electronic itinerancy due to the decreased V-V distance has been theoretically predicted [22,23] and experimentally confirmed [24][25][26]; (iii) FeV 2 O 4 [27][28][29][30][31][32] exhibits at least three transitions. It is unique since the Fe 2+ (3d 6 ) ions have orbital degrees of freedom in the doubly degenerate e g states.…”

Section: Introductionmentioning

confidence: 71%

Evolution of the magnetic and structural properties ofFe1−xCoxV2O4

Sinclair

Cao

et al. 2015

Phys. Rev. B

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The magnetic and structural properties of single crystal Fe1−xCoxV2O4 samples have been investigated by performing specific heat, susceptibility, neutron diffraction, and X-ray diffraction measurements. As the orbital-active Fe 2+ ions with larger ionic size are gradually substituted by the orbital-inactive Co 2+ ions with smaller ionic size, the system approaches the itinerant electron limit with decreasing V-V distance. Then, various factors such as the Jahn-Teller distortion and the spin-orbital coupling of the Fe 2+ ions on the A sites and the orbital ordering and electronic itinerancy of the V 3+ ions on the B sites compete with each other to produce a complex magnetic and structural phase diagram. This phase diagram is compared to those of Fe1−xMnxV2O4 and Mn1−xCoxV2O4 to emphasize several distinct features.

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The preparation and properties of some vanadium spinels

Cited by 180 publications

References 17 publications

Dielectric properties of spinel ceramic Fe1.8V1.2O4

Dielectric properties of spinel ceramic Fe1.8V1.2O4

Orthorhombic distortion and orbital order in the vanadium spinelFeV2O4

Evolution of the magnetic and structural properties ofFe1−xCoxV2O4

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