Elaboration and electrical properties of (0.20 ⩽ x ⩽ 0.55) ceramics with the Y-Bi4V2O11 type structure

Essalim, R.; Tanouti, B.; Bonnet, J.P.; Réau, Jean-Maurice

doi:10.1016/0167-577x(92)90073-s

Cited by 33 publications

(11 citation statements)

References 5 publications

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“…The lattice parameters determined from XRD of these compositions are given in Table 1. The lattice parameter variation is in accordance with the other metal (Cu, Ni, Co) substitution as observed by various authors [18][19][20]. The increase of c-parameter with composition suggests the larger size of Mn 2+ than V 5+ and the small change in the basal a-parameter is considered as the result of oxygen loss.…”

Section: Resultssupporting

confidence: 81%

Ionic conductivity and structural properties of MnO-doped Bi4V2O11 system

Kant¹,

Singh

Pandey

2008

Ionics

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Bi 4 V 2 O 11 exists in three phases viz. α, β, and γ. High temperature γ-phase can be stabilized to room temperature owing to its higher conductivity by the partial substitution of metallic cations for vanadium in Bi 4 V 2 O 11 . Phase transitions from α → β and β → γ are composition and temperature-dependent. Mn 2+ -doped compounds Bi 4 V 2−x Mn x O 11−δ (0≤x≤0.4) have been synthesized by solid state reaction technique and investigated by X-ray diffraction and ionic conductivity measurement. High ionic conducting γ-phase is stabilized for x≥0.2. The ionic conductivity of the series of Bi 4 V 2−x Mn x O 11−δ samples has been measured by using ac impedance spectroscopy technique. The conductivity data do show departure from its simple Arrhenius behavior for all of the compositions. The highest conductivity observed for x= 0.2 sample can be attributed to lower activation energy.

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Section: Resultssupporting

confidence: 81%

Ionic conductivity and structural properties of MnO-doped Bi4V2O11 system

Kant¹,

Singh

Pandey

2008

Ionics

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“…Actually, the best conductivities were always obtained when 10% of V 5+ in the native phase, Bi4V2Oll ' has been substituted by 10% of the metal independently of its oxidation state and its nature. The conductivities of the compounds with M = Cu 2+ or Co 2+ are near than 10 -3 S.cm -~ at 300 ~ [9,11]. Also, Bi4Vi.sM0,1M'0,xOll-~ solid solutions where M and M' are divalent and tetra or pentavalent cations, respectively are known [20].…”

Section: Introductionmentioning

confidence: 96%

Study on structural, thermal, sintering and conductivity of Cu-Co doubly substituted Bi4V2O11

Alga

Ammar²,

Essalim³

et al. 2005

Ionics

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Doubly substitution of vanadium by Cu and Co in the limit of 10% in Bi4V2O11, has led to the formation of the Bi4V1.8Cu0.2−xCoxO10.7 solid solution. X-ray diffraction shows that all the compositions present a tetragonal symmetry. The thermal analysis has revealed that the polymorph γ' phase, which is formed by a partial ordering of oxygen ions in the γ high temperature form, is stabilized at room temperature. The influence of sintering temperature on the microstructure of the samples was investigated by the scanning electron microscopy (SEM). The ceramics sintered at 820 °C for more than 3 hours present micro-craks. The evolution of the electrical conductivity with temperature and the degree of substitution has been investigated by impedance spectroscopy. The sample with x=0.1 presents the highest value of the conductivity ≈4.6×10−2 S·cm−1 at 600 °C

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“…Most of the work on BIMEVOXes has focussed on a composition in which 10% of the V is partially substituted by ions such as Cu 2+ , Ni 2+ , Zn 2+ , Co 2+ , Ti 4+ , Nb 5+ , Ta 5+ , Zr 4+ [6][7][8][9][10]. The oxide ion vacancies order in ␣ and ␤ phases of Bi 4 V 2 O 11 at low temperatures, consequently the conductivity decreases markedly, while they become most disordered with ␥-phase which possesses excellent ionic conductivities at relatively higher temperatures.…”

Section: Introductionmentioning

confidence: 99%