Stabilization of the delta-phase in Bi 2 O 3 thin films

Gómez, Consuelo; Depablos-Rivera, Osmary; Medina, Juan C.; Silva-Bermúdez, Phaedra; Mühl, S.; Zeinert, A.; Rodil, S.E.

doi:10.1016/j.ssi.2013.12.027

Cited by 38 publications

(18 citation statements)

References 44 publications

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“…obtained from XRD measurements are given in Table I and they are in the range 5.5400-5.4862 Å. These results are in a good agreement with the results obtained from similar studies in literature [7,24,25].…”

Section: Xrd Measurement Resultssupporting

confidence: 90%

“…In recent years, fuel cells are attracting tremendous interest because of their direct conversion ability of the electrochemical energy stored in fuel into electrical energy, low system cost, very low pollutants, and great potential for power-generation to meet the demand of various applications with high efficiency. There are many types of the fuel cells and they are, generally, classified according to the electrolyte types used [1], such as phosphoric acid fuel cell (PAFC), proton exchange membrane (PEM) fuel cell, molten carbonate fuel cell (MCFC), direct methanol fuel cell (DMFC), alkaline fuel cell (AFC) and solid oxide fuel cell (SOFC) [2][3][4][5][6] in which solid oxide ceramic electrolytes are used [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

et al. 2016

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In present study, Ho2O3 and Dy2O3 doped Bi2O3 composite materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs) were investigated. (Bi2O3)1−x−y(Ho2O3)x(Dy2O3)y ternary systems (x = 0.11, 0.13, 0.15 and y = 0.01, 0.03, 0.05, 0.07) were fabricated using conventional solid-state synthesis techniques. The samples were characterized by means of X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, differential thermal analysis/thermal gravimeter, and the four-point probe technique. X-ray powder diffraction measurements indicated that all samples have the stable fluorite type face centered cubic (fcc) δ-Bi2O3 phase. Scanning electron microscopy micrographs of all of the samples showed that grain size distribution was uniform. Four-point probe technique measurements showed that the conductivity of the samples increase with increase of temperature. Additionally, it has been found that the maximum conductivity values of all samples fall in a range 8.44 × 10 −2 −4.60 × 10 −1 S cm −1 and their conductivity values corresponding to the intermediatetemperature region vary in the range 1.65 × 10 −3 −2.30 × 10 −1 S cm −1. The activation energy values of the samples were calculated from log σ graphics versus 1000/T using the Arrhenius equation. It was found that there is a good agreement between the activation energy values and conductivity values.

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Section: Xrd Measurement Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

et al. 2016

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“…10 −1 S cm −1 at 400°C. Such high values of conductivity are often measured in bismuth oxides based compounds, although they often appear rather unconsistent in the literature [27][28][29]. Interestingly, no change in conductivity is observed at T=700°C, as expected by the α− to δ−phase transition of Bi 2 O 3 (dashed line figure 2 top).…”

Section: Resultsmentioning

confidence: 74%

Effect of high oxygen deficiency in nano-confined bismuth sesquioxide

et al. 2020

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Bismuth sesquioxide in its cubic form, i.e. δ-Bi 2 O 3 , is the fastest oxygen ionic conductor known which has important applications in energy technologies. However, the material is unstable as it undergoes high-density polymorphic transitions and degradation. In this work, we show that δ-Bi 2 O 3 can be stabilized both at high and low temperatures (T<775°C) under low oxygen partial pressure (pO 2 <10 −5 atm), where the material is nanostructured in multilayered thin film coherent heterostructures with yttrium stabilized zirconia. Density Functional Theory calculation confirms such a form of metastability, also showing that high oxygen defect concentration favors the cubic phase. Moreover, high oxygen deficiency in the nanoionics leads to an unexpected 'two-regime' conductivity with high values (σ>1 S cm −1 at 600°C) at high pO 2 and lower ionic conductivity (σ∼0.1 S cm −1 at 600°C) at low pO 2 . Ionic conductivity at low pO 2 occurs with high activation energy (Ea>1.5 eV), suggesting a drastic decrease in mobility for high concentration of defects.

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“…It had been earlier also used for the smoke detection [32]. The most widely used method for stabilization of α-Bi 2 O 3 (in term to get the defect structure of fluorite-type and high ionic conductivity at low temperature range) consists of doping with Mo, Y, V, Cu, Nb and Er atoms [33,34]. The aim of this research was to produce and characterize the Mo-doped Bi 2 O 3 thin films deposited by PLD technique on the monocrystalline Si substrate.…”

Section: Pld Deposition Of the Bismuth Oxidementioning

confidence: 99%

Deposition Of Oxide And Intermetallic Thin Films By Pulsed Laser (PLD) And Electron Beam (PED) Methods

Kusiński¹,

Kopia²,

Cieniek³

et al. 2015

Archives of Metallurgy and Materials

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In this work the pulsed laser deposition (PLD) and the pulsed electron beam deposition (PED) techniques were used for fabrication of Mo-Bi 2 O 3 , La 1-x Sr x CoO 3 , La 1-x Ca x CoO 3 and Al-Mg thin films. An influence of ablation process basic parameters on the coatings structure and properties was discussed. Two types of laser ablation systems were applied: one equipped with a KrF excimer and second with a Q-switched Nd:YAG. Films were deposited on Si and MgO substrates. Scanning (SEM) and transmission (TEM) electron microscopy, atomic force microscopy (AFM) as well as X-ray diffraction (XRD) were used for structural analysis. Investigations focused on structure and chemical composition showed that smooth and dense thin films with nanocrystalline structure, preserving the composition of the bulk target, could be obtained by the both PLD and PED techniques. Research study showed that by a proper selection of PLD and PED process parameters it was possible to deposit films with significantly decreased amount and size of undesirably nanoparticulates.Keywords: PLD, PED, thin films, structure, doped oxidesOsadzanie laserem impulsowym (PLD) oraz osadzanie impulsową wiązka elektronową (PED) wykorzystane zostało do wytwarzania cienkich filmów typu: Mo-Bi 2 O 3 , La 1-x Sr x CoO 3 , La 1-x Ca x CoO 3 oraz Al-Mg. Dyskutowano wpływ podstawowych parametrów procesu ablacji na strukturę i właściwości uzyskiwanych powłok. Wykorzystane zostały dwa typy systemów do ablacji; jeden z ekscymerowym laserem KrF i drugi na bazie lasera Nd:YAG z modulatorem dobroci (Q-Switch). Filmy osadzano na podłożu Si i MgO. Skaningowa (SEM) i transmisyjna (TEM) mikroskopia elektronowa, mikroskopia sił atomowych (AFM), oraz dyfrakcja rentgenowska (XRD) wykorzystana została do analizy strukturalnej. Badania skoncentrowane na strukturze i skła-dzie chemicznym wykazały jednorodną i zwartą budowę cienkich nanokrystalicznych filmów uzyskanych metodami PLD i PED utrzymujących skład odparowywanych tarcz. Wykazano doświadczalnie, że odpowiednie dobranie parametrów procesu pozwala otrzymywać filmy o istotnym zminimalizowaniu ilości i wymiarów niekorzystnych nanocząstek w powłoce.

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Stabilization of the delta-phase in Bi 2 O 3 thin films

Cited by 38 publications

References 44 publications

Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Effect of high oxygen deficiency in nano-confined bismuth sesquioxide

Deposition Of Oxide And Intermetallic Thin Films By Pulsed Laser (PLD) And Electron Beam (PED) Methods

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Stabilization of the delta-phase in Bi 2 O 3 thin films

Cited by 38 publications

References 44 publications

Synthesizing of (Bi2O3)1-x-y(Ho2O3)x(Dy2O3)yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Synthesizing of (Bi2O3)1-x-y(Ho2O3)x(Dy2O3)yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Effect of high oxygen deficiency in nano-confined bismuth sesquioxide

Deposition Of Oxide And Intermetallic Thin Films By Pulsed Laser (PLD) And Electron Beam (PED) Methods

Contact Info

Product

Resources

About

Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Synthesizing of (Bi₂O₃)_1-x-y(Ho₂O₃)_x(Dy₂O₃)_yElectrolytes for Intermediate-Temperature Solid Oxide Fuel Cells