Synthesis, structure, and conductivity of BIMEVOX oxide ceramics

Zhukovskii, V. M.; Buyanova, E. S.; Emel’yanova, Yu. V.; Морозова, М. В.; Shafigina, R. R.; Захаров, Р. Г.; Журавлев, В. Д.

doi:10.1134/s1023193509050024

Cited by 11 publications

(11 citation statements)

References 7 publications

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“…Figure 9 shows typical impedance diagrams for the BINBVOX solid solu tions. The impedance diagrams are characteristic of 1 μm ionic conductors of the BIMEVOX family, and they have a shape of two combined semicircles [6,[13][14][15]. They were treated with the use of equivalent circuits proposed previously [15].…”

Section: Resultsmentioning

confidence: 99%

Synthesis, structure, and conductivity of BINBVOX ceramics

Buyanova

Морозова

Emel’yanova

et al. 2013

Russ. J. Inorg. Chem.

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Solid solutions based on Bi 4 V 2 O 11 , where vanadium is partially replaced by another cation (ME), form a BIMEVOX family, which is characterized by high oxy gen ionic conductivity at moderate temperatures. According to Abraham et al. [1], bismuth vanadate contains the layers of (Bi 2 O 2 ) 2+ , which alternate with the layers of (VO 3 0.5 ) 2-having anionic sublattice vacancies ( ). The Bi 4 V 2 O 11 compound undergoes a number of polymorphic transformations: α β γ. The high temperature γ modification possesses the highest conductivity. The tetragonal structure of γ Bi 4 V 2 O 11 contains three nonequivalent oxygen positions: O(1) in the layer of Bi 2 O 2 , apical position O(2), and position O(3) in the base plane of V-O polyhedrons. The structure exhibits a maximum disor der of oxygen atoms on positions O(2) and O(3) [2].A number of publications were dedicated to studies of niobium substituted bismuth vanadates. According to published data [3], the composition Bi 2 V 1 -x Nb x O 5.5 (BINBVOX) occurs in α , β , and γ modifications at 0 < x ≤ 0.075, 0.075 < x ≤ 0.15, and 0.15 < х ≤ 0.30, respectively. Steil et al. [4] Attempts at preparing a Bi 2 VO 5.5 phase and BIMEVOX (ME = Zn, Sc, Sb, In, and Pb) by mechanochemical synthesis have been made [9,10]. Diffraction patterns characteristic of the high temperature γ phase were obtained for BIMEVOX. On the contrary, a mixture of phases with the structures of fluorite and clinobisvan ite was detected in the composition of (2Bi 2 O 3 + V 2 O 5 ), which ideally corresponds to the Aurivillius phase formula Bi 2 VO 5.5 . According to Zyryanov [9], compounds with incongruent melting, including Bi 2 VO 5.5 , are not formed upon mechanical synthesis. However, Castro et al. [10] managed to stabilize γ Bi 4 V 2 O 11 by a mechanochemical activation method followed by annealing at a moderate temperature without the introduction of iso or heterovalent sub stituents into the positions of V.This work was dedicated to a study of the preparation, structure, and electrical conductivity of Bi 4 V 2 -x Nb x O 11 solid solutions. EXPERIMENTAL A standard ceramic processing in a temperature range of 770-1070 K, a coprecipitation method, and mechanochemical activation were used for the synthe sis of Abstract-The preparation and the structure and transport characteristics of Bi 4 V 2 -x Nb x O 11 (BINBVOX) were studied. A comparative analysis of the synthesis of solid solutions was performed. The sintering of ceramics and the electrical conductivity as a function of temperature, composition and partial oxygen pres sure were studied.

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Section: Resultsmentioning

confidence: 99%

Synthesis, structure, and conductivity of BINBVOX ceramics

Buyanova

Морозова

Emel’yanova

et al. 2013

Russ. J. Inorg. Chem.

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“…The transition to an ordered γʹ modification with decreasing temperature is accompanied by a small change of slope of the lg σ -10 3 /T dependence and, accordingly, an increase in the activation energy to 0.5-0.7 eV. The tetragonal γ-modification of the Bi 4 V 2-x Fe x O 11-δ is sufficiently stable in a wide range of thermodynamic parameters (T = 298 -1073 K, lg pO 2 (atm) = -0.68 to -18.0) [4,5]. The change of the structure into the orthorhombic one occurs in atmosphere with low oxygen content (lg pO 2 (atm) <-14.0) at temperatures above 773 K. However, decomposition of the sample does not occur.…”

Section: Introductionmentioning

confidence: 91%

“…773 K without decomposition [4,5] the sample of Bi 4 V 1.5 Fe 0.5 O 11-δ prepared accordingly was investigated in the reducing atmosphere with log(pO 2 /atm) < -14.0 by means of dilatometry equipped with special chamber in order to reveal a possible structure transition. The study was carried out with sequential change of gas atmosphere from air via argon to mixture of argon and hydrogen, and back to air in the heating and cooling cycles.…”

Section: Synthesis and Characterization Of The Materialsmentioning

confidence: 99%

“…The family of solid electrolytes with the general formula Bi 4 V 2-x Fe х O 11-δ (BIFEVOX) is characterized by high oxygen-ion conductivity at intermediate temperatures 550-950 K [1][2][3][4][5]. The high-temperature γ-modification of the BIFEVOX solid solutions with tetragonal structure (space group I4/mmm) is obtained at 0.3 ≤ x ≤ 0.5 iron concentration range.…”

Section: Introductionmentioning

confidence: 99%

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Materials based on BIFEVOX and bismuth or iron simple oxides nanopowders

Krylov¹,

Emel’yanova²,

Buyanova³

et al. 2017

CTA

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“…The features of synthesis for each particular case are described in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: The Experimental Partmentioning

confidence: 99%

Crystal structure and conductivity of bismuth-containing complex oxides

et al. 2015

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In the paper, a comprehensive systematic study of different classes of bismuth containing oxide compounds was carried out. The relationship between composition, temperature and concentration regions of existence of stable, specific structure and properties of solid solutions on the basis of vanadates, molybdates, niobates and bismuth was found. The general regularities of synthesis of solid solutions with different variants of solid-phase and soluble methods were determined. On this basis, the optimal conditions for obtaining single-phase materials were formulated. For the first time the temperature and concentration boundaries of the regions of homogeneity and areas of stable existence of polymorphic modifications of solid solutions were defined and/or refined. The structural parameters of the synthesized phases were determined. By the method of electrochemical impedance spectroscopy the nature and features of impedance spectra, the temperature and concentration dependences of electrical conductivity of ceramic materials based on bismuth containing complex oxides were identified.

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Synthesis, structure, and conductivity of BIMEVOX oxide ceramics

Cited by 11 publications

References 7 publications

Synthesis, structure, and conductivity of BINBVOX ceramics

Synthesis, structure, and conductivity of BINBVOX ceramics

Materials based on BIFEVOX and bismuth or iron simple oxides nanopowders

Crystal structure and conductivity of bismuth-containing complex oxides

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