Phase transition studies in BIMEVOX solid electrolytes using AC impedance spectroscopy

Abrahams, Isaac; Krok, F.; Małys, M.; Wróbel, W.

doi:10.1016/j.ssi.2004.08.044

Cited by 44 publications

(22 citation statements)

References 22 publications

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“…Moreover, phase transition study by impedance spectroscopy has found advantage over standard laboratory methods such as thermal analysis and X-ray diffraction study (XRD) study in BIMEVOX-based family [16]. The typical impedance plots obtained by plotting imaginary part Z" against the real part Z' at different frequencies are shown in Fig.…”

Section: Electrical Conductivitymentioning

confidence: 99%

Structural, thermal and transport properties of $$ {\text{B}}{{\text{i}}_4}{{\text{V}}_{2 - {\text{x}}}}{\text{G}}{{\text{a}}_{\text{x}}}{{\text{O}}_{11 - \delta }} $$ (0 ≤ x ≤ 0.4)

Kant

Singh

Pandey

2009

Ionics

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Solid electrolytes are mostly used in solid oxide fuel cells (SOFC). In the present study, gallium-substituted compounds (Bi 4 V 2Àx Me x O 11Àd ; Me=Ga 3+ ; 0≤x≤0.4) were prepared by solid-state reaction technique for its use as an electrolyte in SOFC. Structural and conductivity behavior was studied as a function of the Ga 3+ substitution on vanadium site. The compounds remain in the orthorhombic α-phase for x=0 and 0.1 whereas higher concentration of dopant leads to β-phase stabilization. The highest and lowest ionic conductivity were observed in x=0.2 and x=0.4 samples, respectively. The prepared samples were studied by using alternating current conductivity, differential thermal analysis and X-ray diffraction techniques. The results are discussed on the basis of formation of oxygen vacancy and its ordering.

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Section: Electrical Conductivitymentioning

confidence: 99%

Structural, thermal and transport properties of $$ {\text{B}}{{\text{i}}_4}{{\text{V}}_{2 - {\text{x}}}}{\text{G}}{{\text{a}}_{\text{x}}}{{\text{O}}_{11 - \delta }} $$ (0 ≤ x ≤ 0.4)

Kant

Singh

Pandey

2009

Ionics

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“…This property makes it potentially applied in oxygen separation membranes or solid oxide fuel cells (SOFCs); both have the same control knob: employing a dense oxide conductive only for oxygen ions (i.e., solid electrolyte). However, the three structural phase changes in Bi 4 V 2 O 11−δ (i.e., α⇢β, 447°C and β⇢γ, 567°C) [1] can result in losing the controllability of the vacancy switching into order/disorder, thus hindering its functional applications. The oxygen vacancies order in the α and β phases, but disorder over the oxygen atom positions in the vanadate layers in the γ phase where the highest ionic conductivity and the lowest activation energy are found [2].…”

Section: Introductionmentioning

confidence: 99%

Oxide ion conductors based on niobium-doped bismuth vanadate: conductivity and phase transition features

Khaerudini

Guan

Zhang

et al. 2015

Ionics

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Oxide ion conductors are technologically important materials, essential for electrochemical devices such as oxygen separation membranes and solid oxide fuel cells (SOFCs). Bi 4 V 2−x Me x O 11−δ (BiMeVOx) is a well-known family of material with high ionic conductivity at low operating temperatures. However, it is often reported to possess three structurally related phase changes that affect the vacancy order/ disorder over the oxygen atom positions. This might be overcome by a careful chemical design of an oxide ion conductor by introducing the stabilizing dopants. Here, it is found that niobium (Nb) doping on the V site can increase the stability (tetragonal structure) and ionic conductivity at a temperature range of 200-600°C. This study demonstrates the effect of the doping amount on the ionic conductivity and characterizes the obtained materials by scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential scanning calorimetry (DSC) analyses. The oxidation state of vanadium that related to the electronic structure of BiMeVOx is investigated by X-ray photoelectron spectroscopy (XPS) analysis. It is expected to understand the conductivity and phase transition features of this kind of oxide ion conductor.

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“…The parent bismuth vanadate compound undergoes phase transitions between α and β polymorphous modifications at approximately 700 K and between β-and tetragonal γ-phase at approximately 850 K [3][4][5]. Composition modifications by substitution of different valency cations for V 5+ and/or Bi 3+ cations were aimed at and succeeded in the stabilization of the tetragonal structure phase at the room temperature [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. However, the poor thermodynamic stability of these oxides in reducing atmospheres hinders their real applications and comprises the main task to be solved.…”

Section: Introductionmentioning

confidence: 99%

Phase Transitions and Transport Properties of the Bismuth Vanadate-Based (Bi,La)₄(V,Zr)₂O_11-zCeramics

et al. 2010

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Ceramic solid solutions (Bi 1−y La y ) 4 (V 1−x Zr x ) 2 O 11−z with x = 0-0.05, y = 0-0.16 have been prepared by the solid state reaction method. The samples were studied by differential thermal analysis, X-ray diffraction, dielectric spectroscopy, and impedance methods. The concentration and temperature stabilization regions of the polymorphous α-, β-, γ'-, γ-modifications have been determined. The effects observed in dielectric properties, conductivity, and impedance data confirmed the influence both of intrinsic oxygen vacancies and those "pinned" at ferroelectric domain boundaries on the temperature hysteresis of α-β phase transition and their contribution to mechanism of oxygen ion transport.

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Phase transition studies in BIMEVOX solid electrolytes using AC impedance spectroscopy

Cited by 44 publications

References 22 publications

Structural, thermal and transport properties of $$ {\text{B}}{{\text{i}}_4}{{\text{V}}_{2 - {\text{x}}}}{\text{G}}{{\text{a}}_{\text{x}}}{{\text{O}}_{11 - \delta }} $$ (0 ≤ x ≤ 0.4)

Structural, thermal and transport properties of $$ {\text{B}}{{\text{i}}_4}{{\text{V}}_{2 - {\text{x}}}}{\text{G}}{{\text{a}}_{\text{x}}}{{\text{O}}_{11 - \delta }} $$ (0 ≤ x ≤ 0.4)

Oxide ion conductors based on niobium-doped bismuth vanadate: conductivity and phase transition features

Phase Transitions and Transport Properties of the Bismuth Vanadate-Based (Bi,La)₄(V,Zr)₂O_11-zCeramics

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Phase transition studies in BIMEVOX solid electrolytes using AC impedance spectroscopy

Cited by 44 publications

References 22 publications

Structural, thermal and transport properties of $$ {\text{B}}{{\text{i}}_4}{{\text{V}}_{2 - {\text{x}}}}{\text{G}}{{\text{a}}_{\text{x}}}{{\text{O}}_{11 - \delta }} $$ (0 ≤ x ≤ 0.4)

Structural, thermal and transport properties of $$ {\text{B}}{{\text{i}}_4}{{\text{V}}_{2 - {\text{x}}}}{\text{G}}{{\text{a}}_{\text{x}}}{{\text{O}}_{11 - \delta }} $$ (0 ≤ x ≤ 0.4)

Oxide ion conductors based on niobium-doped bismuth vanadate: conductivity and phase transition features

Phase Transitions and Transport Properties of the Bismuth Vanadate-Based (Bi,La)4(V,Zr)2O11-zCeramics

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Phase Transitions and Transport Properties of the Bismuth Vanadate-Based (Bi,La)₄(V,Zr)₂O_11-zCeramics