Thermochemical and luminescent properties of the K2MgV2O7 and M2CaV2O7 (M = K, Rb, Cs) vanadates

Slobodin, B. V.; Сурат, Л. Л.; Samigullina, R. F.; Ищенко, А. В.; Шульгин, Б. В.; Cherepanov, Alexander

doi:10.1134/s0020168510050158

Cited by 13 publications

(9 citation statements)

References 8 publications

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“…Vanadium oxides based materials have attracted much attention due to their fascinating structures, electronic, optical and magnetic properties, which are relevant to such diverse areas as lubrication, chemical sensor, catalysis, cathode materials in batteries, electrochromic devices and minerals [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Electrical properties and complex impedance analysis of K2ZnV2O7

et al. 2014

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Pyrovanadate K 2 ZnV 2 O 7 has been synthesized by a standard ceramic method. Different techniques have demonstrated a structural phase transition at 575 K. Electrical impedance spectroscopy has been performed over a wide range of frequencies, (200 Hz-1 MHz) and temperatures (514-723 K). Ac conductivity data reveal that for high frequencies, r ac (x) is proportional to x s . The frequency exponent values are found to increase with increasing temperature indicating that the non-overlapping small polaron tunneling is the appropriate conduction mechanism.

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Section: Introductionmentioning

confidence: 99%

Electrical properties and complex impedance analysis of K2ZnV2O7

et al. 2014

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“…Vanadium (V) alkaline and alkaline-earth metal oxides display promising physical properties (electrical, optical, catalytic, etc.). [1][2][3][4][5][6][7][8][9][10][11] Therefore, any additional information about the synthesis and the crystal structure of these systems, and about phase relations in corresponding systems, is of great interest.…”

Section: Introductionmentioning

confidence: 99%

“…1 Ternary diagram illustrating the phases occurring in the K 2 O-CaO-V 2 O 5 system. 4,5,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] The K 2 CaV 2 O 4 compound is marked in the diagram by a white dot. It can be obtained at high-pressure; its formation was not observed during our synthesis 24,26 27 which can be evidence of some structural difficulties to stabilise these compounds.…”

Section: Introductionmentioning

confidence: 99%

K₂CaV₂O₇: a pyrovanadate with a new layered type of structure in the A₂BV₂O₇family

et al. 2013

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The crystal structure of K(2)CaV(2)O(7) prepared by a conventional solid-state reaction has been solved by a direct method and refined using Rietveld full profile fitting based on X-ray powder diffraction data. This compound crystallises in the triclinic space group (P1, Z = 2) with unit cell constants a = 7.1577(1) Å, b = 10.5104(2) Å, c = 5.8187(1) Å, α = 106.3368(9)°, β = 106.235(1)°, γ = 71.1375(9)°. The structure can be described as infinite undulating CaV(2)O(7)(2-) layers parallel to the ac plane, which consist of pairs of edge-sharing CaO(6) octahedra connected to each other through V(2)O(7) pyrogroups. The potassium atoms are positioned in two sites between the layers, with a distorted IX-fold coordination of oxygen atoms. The chemical composition obtained from the structural solution was confirmed by energy-dispersive X-ray analysis. The stability of compounds in the family of alkali metal calcium pyrovanadates is discussed based on an analysis of the correlation between anion and cation sizes and theoretical first-principles calculations.

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“…Vanadium (V) alkaline and alkaline-earth metal oxides display promising physical properties (electrical, optical, catalytic, etc. ) (Klement and Kress, 1961;Badini et al, 1999;Saracco et al, 1999a;Falcón et al, 2004;Zubkov et al, 2009;Slobodin et al, 2010;Gąsior et al, 1979;Inoue et al, 2002;Yamauchi et al, 2004;Patil et al, 1987;Saracco et al, 1999b;Yamaura et al, 2004). Therefore, any additional information about the synthesis and the crystal structure of these systems, and about phase relations in corresponding systems, is of great interest.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of RbBaVO₄ and high-pressure modification of KCaVO₄

et al. 2013

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The crystal structures of KCaVO 4 and RbBaVO 4 , synthesized at high-pressure/high-temperature and by a conventional solid-state reaction, respectively, were determined using X-ray powder diffraction data. These compounds were found to have the β-K 2 SO 4 structure type (space group Pnma, Z = 4) with parameters a = 7.2628(5) Å, b = 5.7258(4) Å, c = 9.6854(7) Å (KCaVO 4 ), and a = 7.8887(1) Å, b = 5.9589(1) Å, c = 10.3958(2) Å (RbBaVO 4 ). The unit cell volume of KCaVO 4 , 402.77(5) Å 3 , is significantly lower than for the low-temperature modification reported previously, 436.2 Å 3 . The difference can be explained by a pressure-induced phase transition to a more dense state resulting from the rotation of tetrahedra and the exchange of oxygen atoms from the first and second coordination spheres for potassium and calcium atoms.

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Thermochemical and luminescent properties of the K2MgV2O7 and M2CaV2O7 (M = K, Rb, Cs) vanadates

Cited by 13 publications

References 8 publications

Electrical properties and complex impedance analysis of K2ZnV2O7

Electrical properties and complex impedance analysis of K2ZnV2O7

K₂CaV₂O₇: a pyrovanadate with a new layered type of structure in the A₂BV₂O₇family

Crystal structure of RbBaVO₄ and high-pressure modification of KCaVO₄

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Thermochemical and luminescent properties of the K2MgV2O7 and M2CaV2O7 (M = K, Rb, Cs) vanadates

Cited by 13 publications

References 8 publications

Electrical properties and complex impedance analysis of K2ZnV2O7

Electrical properties and complex impedance analysis of K2ZnV2O7

K2CaV2O7: a pyrovanadate with a new layered type of structure in the A2BV2O7family

Crystal structure of RbBaVO4 and high-pressure modification of KCaVO4

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Product

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K₂CaV₂O₇: a pyrovanadate with a new layered type of structure in the A₂BV₂O₇family

Crystal structure of RbBaVO₄ and high-pressure modification of KCaVO₄