Investigation of transport numbers in yttrium doped bismuth niobates

Małys, M.; Hołdyński, Marcin; Krok, F.; Wróbel, W.; Dygas, J.R.; Pirovano, Caroline; Vannier, Rose‐Noëlle; Capoen, Edouard; Abrahams, Isaac

doi:10.1016/j.jpowsour.2009.01.001

Cited by 22 publications

(11 citation statements)

References 18 publications

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“…(Table 3). By analogy with the results of [9], one can suggest that this is related to transition from electronic conductiv ity to ionic conductivity (study of the contribution of electronic conductivity into overall conductivity of the studied samples is planned at a later stage). However, the situation is changed to the opposite at an increase in the amount of the dopant in the case of Bi 2.95 Y 0.05 Nb 1 -y Zr y O 7 ± δ .…”

Section: +mentioning

confidence: 84%

“…4-6, Table 3). The general run of temperature dependences of conductiv ity for the studied solid solutions has the shape typical for the cubic modification of bismuth niobate [8][9][10]. Two linear regions can be distinguished in the depen dences.…”

Section: +mentioning

confidence: 87%

“…Niobate Bi 7 Nb 2 O 15.5 , according to [9], has a significant electronic conductivity at low temperatures (≤600°С). Doping by yttrium or an increase in the ratio of Bi : Nb in niobates result in a decrease in the contribution of electronic conductiv ity.…”

Section: Introductionmentioning

confidence: 99%

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Structural and transport characteristics of substituted bismuth niobates

et al. 2013

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Abstract-The results of studying solid solutions with the composition of Bi 3 Nb 1 -y Zr y O 7 ± δ , Bi 2.95 Y 0.05 Nb 1 -y Zr y O 7 ± δ (y = 0-0.5; Δy = 0.1), and Bi 6.95 Y 0.05 Nb 2 -y Zr y O 15.5 (y = 0.1-1; Δy = 0.1) are pre sented. XRD and electron microscopy with X ray microanalysis are used to determine the homogeneity regions of solid solutions; crystallochemical parameters are calculated. It is shown that irrespective of the ratio of Bi : Nb, two cubic phases are formed at an increase in the dopant amount. One of these represents a solid solution based on Bi 3 NbO 7 (δ phase) and the second one is a solid solution based on δ Bi 2 O 3 (δ' phase). Conductivity of sintered samples is studied using the impedance spectroscopy technique. Introduction of yttrium into the bismuth sublattice results in no increase in conductivity of solid solutions, while in the case of the ratio of Bi : Nb = 3 : 1, overall conductivity of solid solutions is somewhat higher at similar dopant con centrations.

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Section: +mentioning

confidence: 84%

Section: +mentioning

confidence: 87%

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Structural and transport characteristics of substituted bismuth niobates

et al. 2013

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“…An approximate estimation of the mole fraction of Nb(IV) in the tetragonal phase showed that its content exceeds the fraction of Nb(IV) in the cubic phase by 0.38%, moreover these atoms are bound within the tetrahedral niobium octahedral clusters by antiferromagnetic superexchange interactions [29]. Such a small content of Nb(IV) in the tetragonal phase must not have a substantial impact on electrophysical properties [23].…”

Section: Resultsmentioning

confidence: 99%

“…Heterovalent substitution of 3d-element atoms, of Zr, Y, W, Er for niobium atoms results in an increase in conductivity [17][18][19][20][21]. The nature of the current carriers and the mechanism of conductivity of bismuth niobate are studied in [22,23]. The conductivity in bismuth niobate was shown to be electron-ionic rather than purely ionic, the electron-ionic conductivity is ascribed to the presence of a small fraction of Nb(IV) ions located in the chains of niobium-oxygen octahedra.spectrum [24,25].…”

Section: Introductionmentioning

confidence: 99%