Grain size dependent electrical conductivity, chemical surface exchange and bulk diffusion coefficient of La0.5Sr0.5Al0.2Fe0.8O3-δ

Sowjanya, Ch.; Mandal, Rupesh; Pratihar, Swadesh K.

doi:10.1016/j.jallcom.2019.152831

Cited by 11 publications

(3 citation statements)

References 44 publications

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Section: Samples Micrography Eds Mapmentioning

confidence: 93%

“…This may be related to the grain size that increases with the increase in temperature due to the sample becoming less porous, increasing electrical conduction. According to the literature [38], this phenomenon of increased conductivity with increasing grain size is common; nevertheless, after a certain grain size, this trend reverses. Comparing the results of the samples obtained, it is possible to verify that the sample with the highest DC conductivity is the sample obtained by SG treated at 1200 °C, with a value of σdc = 0.030 S/m, which is much higher than the maximum conductivity value obtained by LFZ, which was the sample grown at a rate of 100 mm/h with a value of σdc = 0.0016 S/m.…”

Section: Samples Micrography Eds Mapmentioning

confidence: 93%

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Unveiling the Synthesis of Strontium Ferrites by Sol-Gel and Laser Floating Zone Methods for Energy Application

Soreto Teixeira,

Ferreira,

Carvalho

et al. 2024

Crystals

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This work proposes the synthesis of strontium ferrite by two different methods: sol-gel (SG), using powdered coconut water (PCW) as a precursor, and laser floating zone (LFZ). The SG samples were after treated at temperatures of 700, 1000, and 1200 °C, while the samples obtained by LFZ were grown at pulling rates of 10, 50, and 100 mm/h. All samples studied were subjected to structural characterization techniques, as well as electrical (AC and DC) and magnetic characterization. Through X-ray diffraction, it was possible to observe that all the samples presented strontium ferrites, but none were single phase. The phases detected in XRD were confirmed by Raman spectroscopy. Scanning electron micrography allowed the observation of an increase in grain size with the temperature of SG samples and the reduction of the porosity with the decrease in growth rate for LFZ fibers. Through electrical analysis, it was observed that the most suitable samples for energy storage were the samples grown at 100 mm/h (εr′ = 430,712; εr″ = 11,577; tan δ = 0.84; σac = 0.0006 S/m, at 1 kHz). The remaining samples had high dielectric losses and can be applied in electromagnetic shielding. The SG 700 °C sample presented the highest magnetization (38.5 emu/g at T = 5 K).

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Section: Samples Micrography Eds Mapmentioning

confidence: 93%

Section: Samples Micrography Eds Mapmentioning

confidence: 93%

Unveiling the Synthesis of Strontium Ferrites by Sol-Gel and Laser Floating Zone Methods for Energy Application

Soreto Teixeira,

Ferreira,

Carvalho

et al. 2024

Crystals

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show abstract

“…The data reported by Brockman et al [46] indicate that near-α titanium polycrystal has a typical granular microstructure. Chen et al [47], Iwoaka et al [48], Lee et al [19], Oudriss et al [37], Sowjanya et al [49], Zheng et al [14], and Jiang et al [50] also reported the typical morphology of Gd 0 . 1 Ce 0 .…”

Section: Introductionmentioning

confidence: 97%

Kinetic Modeling of Grain Boundary Diffusion: Typical, Bi-Modal, and Semi-Lamellar Polycrystalline Coating Morphologies

2022

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Polycrystalline coatings and materials are widely used in engineering applications. Therefore, it is important to know their kinetics and mass transport mechanisms. The effect of grain boundaries (GBs) on diffusion in thin films with different morphologies lacks understanding. Numerical studies are necessary to study GB kinetics but are limited to simplified cases. The present work addresses the lack of diffusion studies in more complex morphologies. Diffusion in two-dimensional polycrystalline coatings of typical, bi-modal, and semi-lamellar morphologies was modeled and the influence of the microstructure on the diffusion regimes and the overall rate was identified. Different morphologies with similar diffusion coefficients provided different regimes. The regime depends not only on the total diffusivity and grain/GB diffusivities, but also on the morphological features of the surface. While the fast diffusion pathways of GBs accelerated diffusion, the level of acceleration depends on the morphology since fast pathways and flux areas are limited to GBs. GB distribution is important to the mass transfer process, as GBs accelerate diffusion locally. The overall diffusion rate is generally dependent on the diffusion coefficients ratio. Nevertheless, the level of this dependence relies on the morphology.

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Effect of oxygen nonstoichiometry on electrical conductivity and oxygen transport parameters of Cu-substituted La0.5Sr0.5Co0.8Fe0.2O3-δ perovskite oxides

Mandal

Behera

Pratihar

2023

J Solid State Electrochem

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Grain size dependent electrical conductivity, chemical surface exchange and bulk diffusion coefficient of La0.5Sr0.5Al0.2Fe0.8O3-δ

Cited by 11 publications

References 44 publications

Unveiling the Synthesis of Strontium Ferrites by Sol-Gel and Laser Floating Zone Methods for Energy Application

Unveiling the Synthesis of Strontium Ferrites by Sol-Gel and Laser Floating Zone Methods for Energy Application

Kinetic Modeling of Grain Boundary Diffusion: Typical, Bi-Modal, and Semi-Lamellar Polycrystalline Coating Morphologies

Effect of oxygen nonstoichiometry on electrical conductivity and oxygen transport parameters of Cu-substituted La0.5Sr0.5Co0.8Fe0.2O3-δ perovskite oxides

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