Iron(III) tungstate and its modifications

Walczak, J.; Rychiowska-Himmel, I.; Tabero, P.

doi:10.1007/bf01151850

Cited by 29 publications

(25 citation statements)

References 4 publications

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“…The preparation procedure for the a-Fe 2WO 6 compound has been previously described in detail [1]. Identification of the polycrystalline sample was made through a Drone-3 X-ray diffractometer (XRD) using CoK a radiation.…”

Section: Methodsmentioning

confidence: 99%

“…Two and three component systems of transition metal oxides have been the subject of considerable interest, due to their catalytic properties [1]. Iron tungstate, Fe2WO6, which is a member to the Fe 20 3 -W03 system, was synthesized for the first time by Kozmanov [2] from oxidation of ferrberite above 600°C and by Bayer [3] by heating of equimolar mixture of Fe 2 03 and W03 .…”

Section: Introductionmentioning

confidence: 99%

“…Iron tungstate, Fe2WO6, which is a member to the Fe 20 3 -W03 system, was synthesized for the first time by Kozmanov [2] from oxidation of ferrberite above 600°C and by Bayer [3] by heating of equimolar mixture of Fe 2 03 and W03 . Recently, it was found that three different polymorphic modifications, namely a-, (3-and yFe2WO6, of iron tungstate can be synthesized [1,4]. Earlier, Parent et al [5] showed the existence of two forms: the low-temperature, a-phase in the present notation, and the high-temperature y-phase, both belonging to the orthorhombic space group (D21 ), the main structural difference between them being the nature of cation ordering [6].…”

Section: Introductionmentioning

confidence: 99%

“…In a-Fe2WO6 two iron and one tungsten zigzag chains occur, while in y-Fe2WO6 one zigzag chain consists solely of iron ions, whereas two other chains exhibit one-to-one ordering of iron and tungsten ions. Recently, Walczak et al [1] have reported the new polymorphic modification which crystallizes in the monoclinic system (13-Fe 2WO 6). The Fe2WO6 system has been the subject of experimental studies aimed to establish the correlation among its structural, magnetic and conducting properties [3,7,8].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase transition study in α-Fe2WO6 compound by EPR

et al. 1998

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“…The last system seemed to be the least investigated and therefore attracted our attention (1 (4). Magnetic susceptibility and EPR measurements at low temperature revealed a significant paramagnetic contribution, probably resulting from local distortions of the antiferromagnetic bulk structure induced by a disturbed cation ordering or the presence of Fe> ions (5).…”

Section: Three-component Systems Of Transition Metal Oxides Such As Fementioning

confidence: 99%