BaCeO3: Materials development, properties and application

Medvedev, Dmitry; Мурашкина, А. А.; Demin, A.; Podias, A.; Tsiakaras, Panagiotis

doi:10.1016/j.pmatsci.2013.08.001

Cited by 345 publications

(174 citation statements)

References 356 publications

(352 reference statements)

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“…Here we only consider the simple cubic unit cell for BaZrO 3 since all the materials are cubic at high temperatures. 15,23 Even though an M 4+ -vacancy is closer as a neighbour to Ba 2+ , the size and the energy of formation for such a vacancy are not favourable for Ba 2+ to move through a M 4+ vacancy. 20 We have recently reported excellent agreement between computed and experimentally determined activation energy for Ba 2+ diffusion in BaZrO 3 by this diffusion mechanism.…”

Section: Ba Xmentioning

confidence: 99%

134Ba diffusion in polycrystalline BaMO3 (M = Ti, Zr, Ce)

et al. 2017

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Cation diffusion in functional oxide materials is of fundamental interest, particularly in relation to interdiffusion of cations in thin film heterostructures and chemical stability of materials in high temperature electrochemical devices. Here we report on 134Ba tracer diffusion in polycrystalline BaMO3 (M = Ti, Zr, Ce) materials. The dense BaMO3 ceramics were prepared by solid state sintering, and thin films of 134BaO were deposited on the polished pellets by drop casting of an aqueous solution containing the Ba-tracer. The samples were subjected to thermal annealing and the resulting isotope distribution profiles were recorded by secondary ion mass spectrometry. The depth profiles exhibited two distinct regions reflecting lattice and grain boundary diffusion. The grain boundary diffusion was found to be 4-5 orders of magnitude faster than the lattice diffusion for all three materials. The temperature dependence of the lattice and grain boundary diffusion coefficients followed an Arrhenius type behaviour, and the activation energy and pre-exponential factor demonstrated a clear correlation with the size of the primitive unit cell of the three perovskites. Diffusion of Ba via Ba-vacancies was proposed as the most likely diffusion mechanism.

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Section: Ba Xmentioning

confidence: 99%

134Ba diffusion in polycrystalline BaMO3 (M = Ti, Zr, Ce)

et al. 2017

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“…Traces of various barium cerates (BaCeO3) were also found. This material is an important ingredient in the development of fuel cells (Ketzial et al 2013;Medvedev et al 2014). Further investigation is needed in order to utilize bio-char as an alternative source of barium cerate in fuel cell application.…”

Section: Characterization Of Bio-oil Non-condensable Gas and Bio-charmentioning

confidence: 99%

Pyrolysis of Napier Grass in a Fixed Bed Reactor: Effect of Operating Conditions on Product Yields and Characteristics

Mohammed

Abakr

Kazi

et al. 2015

BioRes

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This study presents a report on pyrolysis of Napier grass stem in a fixed bed reactor. The effects of nitrogen flow (20 to 60 mL/min), and reaction temperature (450 to 650 °C) were investigated. Increasing the nitrogen flow from 20 to 30 mL/min increased the bio-oil yield and decreased both bio-char and non-condensable gas. 30 mL/min nitrogen flow resulted in optimum bio-oil yield and was used in the subsequent experiments. Reaction temperatures between 450 and 600 °C increased the bio-oil yield, with maximum yield of 32.26 wt% at 600 o C and a decrease in the corresponding bio-char and non-condensable gas. At 650 °C, reductions in the bio-oil and bio-char yields were recorded while the non-condensable gas increased. Water content of the bio-oil decreased with increasing reaction temperature, while density and viscosity increased. The observed pH and higher heating values were between 2.43 to 2.97, and 25.25 to 28.88 MJ/kg, respectively. GC-MS analysis revealed that the oil was made up of highly oxygenated compounds and requires upgrading. The bio-char and non-condensable gas were characterized, and the effect of reaction temperature on the properties was evaluated. Napier grass represents a good source of renewable energy when all pyrolysis products are efficiently utilized..

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“…Using the as-synthesized BYZ powders and the powders treated using the different milling methods, compacts were obtained and compared following sintering at 1640°C for 15 h. Figure 2 shows the XRD patterns of the as-synthesized BYZ powders and the sintered compacts and reveals that the only phase present is Y- doped BaZrO 3 . The sintered pellets also show the same crystalline structure, which provides evidence for the purity of the inner phase.…”

Section: Resultsmentioning

confidence: 99%

“…Perovskite-type oxides, such as doped BaCeO 3 , SrCeO 3 and BaZrO 3 , have attracted the attention of many studies for their role as the solid electrolyte in intermediate temperature Solid Oxide Fuel Cells (SOFCs) due to their excellent proton conductivity in hydrogen or water containing atmospheres. 1)3) Among these, zirconates are favored over cerates for their high chemical stability in H 2 O-and CO 2 -containing atmospheres and high mechanical strength, increasing their practical application.…”

Section: Introductionmentioning

confidence: 99%

“…4)6) Y-doped BaZrO 3 has been demonstrated to be the best candidate for use in SOFCs due to its high proton conductivity, and sufficient chemical and mechanical stability, when compared to other perovskitetype proton conductors. 4), 7) The application of Y-doped BaZrO 3 as a solid electrolyte in SOFCs, gas sensors and hydrogen pumps requires both high density and high conductivity.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and proton conductivity of ultrafine Y-doped BaZrO<sub>3</sub> ceramics

Xia

Nian

et al. 2017

J. Ceram. Soc. Japan

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Y-doped BaZrO 3 powders prepared by high-temperature solid state reactions often suffer the disadvantage of serious aggregation. In order to eliminate this disadvantage, planet-mill and sand-mill processing methods were employed. The results of particle-size determination and scanning electron microscopy images confirm that sand milling can efficiently eliminate the aggregation and produce ultrafine and well-dispersed Y-doped BaZrO 3 powders. Starting from powders treated by sand milling, completely densified Y-doped BaZrO 3 ceramics can be fabricated by sintering at a low temperature of 1640°C for 15 h. Y-doped BaZrO 3 ceramics sintered from powders treated by sand-mill for 5 h possess an ultrafine crystal size and a higher density and proton conductivity compared to those treated for 2 h.

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BaCeO3: Materials development, properties and application

Cited by 345 publications

References 356 publications

134Ba diffusion in polycrystalline BaMO3 (M = Ti, Zr, Ce)

134Ba diffusion in polycrystalline BaMO3 (M = Ti, Zr, Ce)

Pyrolysis of Napier Grass in a Fixed Bed Reactor: Effect of Operating Conditions on Product Yields and Characteristics

Preparation and proton conductivity of ultrafine Y-doped BaZrO<sub>3</sub> ceramics

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