Preparation and properties of the systems Fe2−xCrxWO6, Fe2−xRhxWO6, and Cr2−xRhxWO6

Leiva, H.; Kershaw, R.; Dwight, K.; Wold, A.

doi:10.1016/0022-4596(83)90021-x

Cited by 10 publications

(12 citation statements)

References 12 publications

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“…The material is composed of "zig-zag" chains of edge-sharing oxygen octahedra with one-third of the chains containing only iron whilst the remainder comprise alternating W-and Fe-centred octahedra (4,7,8). Hence it is possible that there might be slight differences between the electric field gradients at the iron nuclei in the two types of chains.…”

Section: Iron-tungsten Oxidesmentioning

confidence: 99%

“…Subsequently, Leiva eta!. (5)(6)(7)(8) have investigated the properties of iron tungstates prepared as reported by Senegas and Galy (4) and reported that the material is best considered as a solid solution of FeW04 in Fe2WO6 (5,6). The materials were described by the formula Fe2->W +*06 (5).…”

Section: Introductionmentioning

confidence: 99%

“…The materials were described by the formula Fe2->W +*06 (5). Given the sensitivity of Moessbauer spectroscopy (7) to the oxidation state of iron and the uncertainty (4-6) surrounding the oxidation state of iron in "Fe2W06" it seemed surprising that no Moessbauer studies of iron tungstates prepared from Fe203 and WO, have been reported. Hence we have undertaken an iron-57 Moessbauer spectroscopic study of these materials in an attempt to clarify the nature of these materials.…”

Section: Introductionmentioning

confidence: 99%

“…It was also noted that studies of chromium-doped iron tungstates have been recently carried out (7,8). It was reported that a solid solution series, Cr2,.Fe,.W06, with the trirutile structure of Cr2W06 could be prepared, although the series did not appear to extend across the composition range 0 5 y 5 2 (7,8).…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that a solid solution series, Cr2,.Fe,.W06, with the trirutile structure of Cr2W06 could be prepared, although the series did not appear to extend across the composition range 0 5 y 5 2 (7,8). Given that other mixed metal oxide systems based on iron and chromium have been reported to show magnetic properties which were dependent on x in Fe2-xCr,03 (9) and Fe2,Cr,Te06 (1 O), and which were sensitive to detection by Moessbauer spectroscopy, the iron-tungsten system has also been examined by this technique.…”

Section: Introductionmentioning

confidence: 99%

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A study of iron–tungsten oxides and iron–chromium–tungsten oxides

Birchall¹,

Hallett²,

Vaillancourt³

et al. 1988

Can. J. Chem.

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A 57Fe Moessbauer study of the Fe2O3–WO3 and Fe2O3–Cr2O3–WO3 systems has been carried out. Single phase materials could be prepared having the composition Fe2−xWO6−3x/2 (x = 0.28), the stoichiometric Fe2WO6 always contained detectable amounts of α-Fe2O3. The iron tungstates are found to be unstable to prolonged heating at 1000 °C. The Cr2−yFeyWO6 (0 < y ≤ 2) system was shown to be of the trirutile type when y ≤ 1.7 but multiphasic when y ≥ 1.7, these latter phases have structures based upon the iron and chromium tungstate phases, respectively. The Moessbauer parameters for the Cr2−xFeyWO6 compositions do not appear to behave in the same fashion as the related Fe2−xCrxTeO6 system.

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Section: Iron-tungsten Oxidesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A study of iron–tungsten oxides and iron–chromium–tungsten oxides

Birchall¹,

Hallett²,

Vaillancourt³

et al. 1988

Can. J. Chem.

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Phase transition study in α-Fe2WO6 compound by EPR

et al. 1998

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The temperature dependence of the EPR spectrum for the a-phase of iron tungstate has been investigated in the temperature range of 40-260 K. At temperatures between T, -250 K and T2 205 K where the antiferromagnetic phase transition occurs, a relatively narrow EPR line arising from the dominant iron(III) species has emerged, gaining intensity with the temperature increase.Its linewidth temperature evolution could be described by Huber equation, with T N = 200 K, which is consistent with the peak seen in magnetic susceptibility measurements, while the corresponding g-factor shifts to higher fields reflecting the build-up of internal field emerging from increasing shortrange order in the spin system. At temperatures lower than T2, a very broad and distorted EPR line with temperature dependent g-factor and linewidth has been observed reflecting the corresponding rise of the magnetic susceptibility below the antiferromagnetic phase transition, presumably arising from magnetic clusters embedded in the antiferromagnetic background.

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Chromium

Colton¹

1985

Coordination Chemistry Reviews

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Preparation and properties of the systems Fe2−xCrxWO6, Fe2−xRhxWO6, and Cr2−xRhxWO6

Cited by 10 publications

References 12 publications

A study of iron–tungsten oxides and iron–chromium–tungsten oxides

A study of iron–tungsten oxides and iron–chromium–tungsten oxides

Phase transition study in α-Fe2WO6 compound by EPR

Chromium

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