Structural and electrical properties of Bi2O3–Nb2O5 thin films grown at low temperatures by pulsed laser deposition

Sun, Jong Woo; Lee, Kang; Kim, Jin-Seong; Joung, Mi Ri; Nahm, Sahn; Seong, Tae Geun; Kang, Chong Yun; Kim, Jong Hee

doi:10.1016/j.actamat.2011.05.017

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…Assuming an upper limit oxidation state of Nb 5+ , this stoichiometry suggests a significant presence of oxygen in forms other than oxide O 2− , such as interstitial O 0 , electron deficient oxygen anion O − , superoxide anion O 2 − , peroxide anion O 2 2− , or ozonide anion O 3− . Several reports have claimed interstitial O x species in diverse metal oxides, [103–107] however related XPS observations noted those between the lattice O peak and non‐lattice O peak [104–106] . EPR analysis of samples calcined between 475–600 °C were conducted to detect paramagnetic oxygen species containing unpaired electrons.…”

Section: Resultsmentioning

confidence: 99%

Amorphization of Pseudocapacitive T−Nb₂O₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

Bergh

Wechsler

Lokupitiya

et al. 2022

Batteries & Supercaps

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Intercalation pseudocapacitance can combine capacitor‐like power densities with battery‐like energy densities. Such surface‐limited behavior requires rapid diffusion where amorphization can increase solid‐state diffusivity. Here intercalation pseudocapacitive materials with tailored extents of amorphization in T‐Nb2O5 are first reported. Amorphization was characterized with WAXS, XPS, XAFS, and EPR which suggested a peroxide‐rich (O22−) surface that was consistent with DFT predictions. A series of tunable isomorphic architectures enabled comparisons while independently varying transport parameters. Through process of elimination, solid‐state lithium diffusion was identified as the dominant diffusive‐constraint dictating the maximum voltage sweep rate for surface‐limited kinetics (vSLT), termed the Surface‐Limited Threshold (SLT). The vSLT increased with amorphization however stable cycling required crystalline T‐Nb2O5. A current‐response model using series‐impedances well‐matched these observations. This perspective revealed that amorphization of T‐Nb2O5 enhanced solid‐state diffusion by 12.2 % and increased surface‐limitations by 17.0 % (stable samples). This approach enabled retaining 95 % lithiation capacity at ∼800 mV s−1 (1,600 C‐rate equivalent).

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Section: Resultsmentioning

confidence: 99%

Amorphization of Pseudocapacitive T−Nb₂O₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

Bergh

Wechsler

Lokupitiya

et al. 2022

Batteries & Supercaps

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“…The chemical compositions of PLD targets and the deposited films were also investigated via inductively coupled plasma mass spectrometry. Considering the loss of bismuth in the high-temperature and high-vacuum conditions of the PLD process, , we analyzed the composition of the thin films using targets with three different Y/Bi cation ratios (Figure S3). As a result, it was confirmed that the PLD target with 18% of Y cations could produce the YSB 25 (25% of Y) thin film used in this study.…”

Section: Resultsmentioning

confidence: 99%

Conductive Nature of Grain Boundaries in Nanocrystalline Stabilized Bi₂O₃ Thin-Film Electrolyte

Jeong

Kwak

Byeon

et al. 2018

ACS Appl. Mater. Interfaces

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Stabilized BiO has gained a considerable amount of attention as a solid electrolyte material for low-temperature solid oxide fuel cells due to its superior oxygen-ion conductivity at the temperature of relevance (≤500 °C). Despite many research efforts to measure the transport properties of stabilized BiO, the effects of grain boundaries on the electrical conductivity have rarely been reported and their results are even controversial. Here, we attempt quantitatively to assess the grain boundary contribution out of the total ionic conductivity at elevated temperatures (350-500 °C) by fabricating epitaxial and nano-polycrystalline thin films of yttrium-stabilized BiO. Surprisingly, both epitaxial and polycrystalline films show nearly identical levels of ionic conductivity, as measured by alternating current impedance spectroscopy and this is the case despite the fact that the polyfilm possesses nanosized columnar grains and thus an extremely high density of the grain boundaries. The highly conductive nature of grain boundaries in stabilized BiO is discussed in terms of the clean and chemically uniform grain boundary without segregates, and the implications for device application are suggested.

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“…The preferred ones, because less expensive and less complicated that allow for the formation of oxide layers (e.g. Bi 2 O 3 ) are, for example, the sol-gel method [9] and, for the sake of material purity, pulsed laser deposition (PLD) [16,17,[27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Kąc¹,

Szwachta²,

Cieniek³

et al. 2019

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The aim of the work was to obtain thin bismuth oxide films containing, at room temperature, the Bi 1,5 Er 0,5 O 3 phase. This phase corresponds to the structure of the high-temperature δ-Bi 2 O 3 phase, in pure bismuth oxide, characterized by the highest ionic conductivity of all known solid state ionic conductors. The high-temperature δ-Bi 2 O 3 phase with the face centered cubic structure, in pure bismuth oxide, occurs only at temperature above 730°C.Stabilization of the δ-Bi 2 O 3 phase at room temperature was achieved by an addition of the erbium together with the employment of the Pulsed Laser Deposition (PLD) technique. The influence of an amount of Er alloying and the film thickness on surface morphology, microstructure, phase composition of thin films were investigated. The velocity of deposition of thin layers of bismuth stabilized with erbium in the PLD process using the Nd: YAG laser was about 0.5 nm/s.The investigation results of erbium doped bismuth oxide thin films deposited onto (0001) oriented Al 2 O 3 monocrystalline substrate are presented.Thin films of uniform thickness, without cracks, and porosity were obtained. All deposited thin films (regardless of the film thickness or erbia (Er 2 O 3 ) content) exhibited a columnar structure. In films stabilized with erbium, up to approx. 250 nm thickness, the columns have a diameter at the base from 25 to 75 nm. The columns densely and tightly fill the entire volume of the films. With increasing of the film thickness increases, porosity also significantly increases. In thin layers containing from 20 to 30 mole % Er 2 O 3 the main identified phase at room temperature is Bi 1.5 Er 0.5 O 3 . It is similar to the defective fluorite-type structure, and belongs to the Fm-3m space group. This phase corresponds to the structure of the high-temperature δ-Bi 2 O 3 phase in pure bismuth oxide.

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Structural and electrical properties of Bi2O3–Nb2O5 thin films grown at low temperatures by pulsed laser deposition

Cited by 9 publications

References 14 publications

Amorphization of Pseudocapacitive T−Nb₂O₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

Amorphization of Pseudocapacitive T−Nb₂O₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

Conductive Nature of Grain Boundaries in Nanocrystalline Stabilized Bi₂O₃ Thin-Film Electrolyte

Archives of Metallurgy and Materials

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Structural and electrical properties of Bi2O3–Nb2O5 thin films grown at low temperatures by pulsed laser deposition

Cited by 9 publications

References 14 publications

Amorphization of Pseudocapacitive T−Nb2O5 Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

Amorphization of Pseudocapacitive T−Nb2O5 Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

Conductive Nature of Grain Boundaries in Nanocrystalline Stabilized Bi2O3 Thin-Film Electrolyte

Archives of Metallurgy and Materials

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Amorphization of Pseudocapacitive T−Nb₂O₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

Amorphization of Pseudocapacitive T−Nb₂O₅ Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

Conductive Nature of Grain Boundaries in Nanocrystalline Stabilized Bi₂O₃ Thin-Film Electrolyte