A-site-cation deficiency in the SrCe0.9Yb0.1O3−δ perovskite: effects of charge-compensation mechanism on structure and proton conductivity

Mather, Glenn C.; García-Martín, Susana; Benne, Darja; Ritter, C.; Amador, Ulises

doi:10.1039/c0jm04464d

Cited by 27 publications

(23 citation statements)

References 55 publications

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“…One can hypothesise that impairment of grain growth on increasing barium loss may arise due to the segregation of secondary phases, such as Y 2 O 3 , that pin grains preventing growth [35] or, alternatively, due to a decrease in cation diffusion rates [33]. The latter analogy implies that Ba-loss would be partially accommodated by dopant partitioning across the A and B sites, leading to resultant decreases in point defect concentrations and impairment of grain growth [36,37]. Note that the latter analogy has also been widely proposed to explain grain-growth inhibition in doped BaTiO 3 materials [38].…”

Section: Phase Analysis and Microstructurementioning

confidence: 96%

Effect of phosphorus additions on the sintering and transport properties of proton conducting BaZr0.85Y0.15O3−δ

Soares

Zhang

Antunes

et al. 2012

Journal of Solid State Chemistry

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Section: Phase Analysis and Microstructurementioning

confidence: 96%

Effect of phosphorus additions on the sintering and transport properties of proton conducting BaZr0.85Y0.15O3−δ

Soares

Zhang

Antunes

et al. 2012

Journal of Solid State Chemistry

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“…and a partition mechanism involving distribution of the B-site species over both A and B sites 20 , expressed below for the case of Pr:…”

Section: Phase Formation Phase Fields and Cation Distributionmentioning

confidence: 99%

“…We note that in other A-site deficient series, anomalous variations in unit-cell parameters with compositions are observed 36 . In the case of Sr1-xCe0.9Yb0.1O3-, this was attributed to a change in compensation mechanism for A-site vacancy to dopant partitioning with increasing A-site cation deficiency 20 . In the present study, the Rietveld results indicate that the compensation mechanism is unchanged throughout the series.…”

Section: Phase Formation Phase Fields and Cation Distributionmentioning

confidence: 99%

“…In general, A-site deficiency is a widely adopted strategy for tailoring the defect chemistry and doping mechanisms in technologically relevant perovskites in order to improve the physicochemical properties [17][18][19][20] . A-site substoichiometry in Y-doped BaZrO3- (BZY) arising from Ba evaporation on sintering is considered to be compensated by partitioning of the Y dopant on the A site leading to a decrease in proton conductivity and unit cell constant 21 .…”

Section: Introductionmentioning

confidence: 99%

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Structures, Phase Fields, and Mixed Protonic–Electronic Conductivity of Ba-Deficient, Pr-Substituted BaZr_0.7Ce_0.2Y_0.1O_3−δ

et al. 2018

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The BaZr0.7Ce0.2Y0.1O3--BaPrO3- perovskite system, of interest for high-temperature electrochemical applications involving mixed protonic-electronic conductivity, forms a solid solution with a wide interval of Ba substoichiometry in the range Ba(Ce0.2Zr0.7)1-xPrxY0.1O3-, 0 ≤ x ≤ 1. Structural phase transitions mapped as a function of temperature and composition by high-resolution neutron powder diffraction and synchrotron X-ray diffraction reveal higher symmetry for lower Pr content and higher temperatures, with the largest stability field observed for rhombohedral symmetry (space group, 3 ̅). Rietveld refinement, supported by magnetic-susceptibility measurements, indicates that partitioning of the B-site cations over the A and B perovskite sites compensates Ba substoichiometry in preference to A-site vacancy formation and that multiple cations are distributed over both sites. Electron-hole transport dominates electrical conductivity in both wet and dry oxidising conditions, with total conductivity reaching a value of ~ 0.5 S.cm-1 for the x = 1 end-member in dry air at 1173 K. Higher electrical conductivity and the displacement of oxygen loss to higher temperatures with increasing Pr content both reflect the role of Pr in promoting hole formation at the expense of oxygen vacancies. In more reducing conditions (N2) and at low Pr contents, conductivity is higher in humidified atmospheres (~ 0.023 atm pH2O) indicating a protonic contribution to transport, whereas the greater electron-hole conductivity with increasing Pr content results in lower conductivity in humidified N2 due to the creation of protonic defects and the consumption of holes.

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“…Chemically-stable high-temperature proton conductors, in particular electrolytes based on Y-doped BaZrO 3 , are extremely promising for applications in SOFCs operating at reduced temperatures, i.e., 600 °C and below. The advances made on improving the sinterability of powders, bringing the sintering temperatures at values similar to those needed for yttria-stabilized zirconia (YSZ) and allowing powder-based and low-cost fabrication technologies compatible with mass production, encourage the development of a next generation of anode-supported SOFCs based on proton-conducting electrolytes, operating at 600 °C with hydrogen or even hydrocarbon and alcohol fuels (figure 11.b) [24][25][26][27][28][29][30][31][32][33][34][35][36][37]. attaining a quite high densification (> 98%).…”

Section: Proton Conductivity In Oxides (Based On Work From the Solidmentioning

confidence: 99%

Recent advances in perovskites: Processing and properties

Moure

Peña

2015

Progress in Solid State Chemistry

161

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The perovskite structure is one of the most wonderful to exist in nature. It obeys to a quite simple chemical formula, ABX 3 , in which A and B are metallic cations and X, an anion, usually oxygen. The anion packing is rather compact and leaves interstices for large A and small B cations. The A cation can be mono, di or trivalent, whereas B can be a di, tri, tetra, penta or hexavalent cation. This gives an extraordinary possibility of different combinations and partial or total substitutions, resulting in an incredible large number of compounds. Their physical and chemical properties strongly depend on the nature and oxidation states of cations, on the anionic and cationic stoichiometry, on the crystalline structure and elaboration techniques, etc.In this work, we review the different and most usual crystalline representations of perovskites, from high (cubic) to low (triclinic) symmetries, some well-known preparation methods, insisting for instance, in quite novel and original techniques such as the mechanosynthesis processing. Physical properties are reviewed, emphasizing the electrical (proton, ionic or mixed conductors) and catalytic properties of Mn-and Co-based perovskites ; a thorough view on the ferroelectric properties is presented, including piezoelectricity, thermistors or pyroelectric characteristics, just to mention some of them ; relaxors, microwave and optical features are also discussed, to end up with magnetism, superconductivity and multiferroïsme.Some materials discussed herein have already accomplished their way but others have promising horizons in both fundamental and applied research.To our knowledge, no much work exists to relate the crystalline nature of the different perovskite-type compounds with their properties and synthesis procedures, in particular with the most recent and newest processes such as the mechanosynthesis approach. Although this is not intended to be a full review of all existing perovskite materials, this report offers a good compilation of the main compounds, their structure and microstructure, processing and relationships between these features.

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A-site-cation deficiency in the SrCe0.9Yb0.1O3−δ perovskite: effects of charge-compensation mechanism on structure and proton conductivity

Cited by 27 publications

References 55 publications

Effect of phosphorus additions on the sintering and transport properties of proton conducting BaZr0.85Y0.15O3−δ

Effect of phosphorus additions on the sintering and transport properties of proton conducting BaZr0.85Y0.15O3−δ

Structures, Phase Fields, and Mixed Protonic–Electronic Conductivity of Ba-Deficient, Pr-Substituted BaZr_0.7Ce_0.2Y_0.1O_3−δ

Recent advances in perovskites: Processing and properties

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A-site-cation deficiency in the SrCe0.9Yb0.1O3−δ perovskite: effects of charge-compensation mechanism on structure and proton conductivity

Cited by 27 publications

References 55 publications

Effect of phosphorus additions on the sintering and transport properties of proton conducting BaZr0.85Y0.15O3−δ

Effect of phosphorus additions on the sintering and transport properties of proton conducting BaZr0.85Y0.15O3−δ

Structures, Phase Fields, and Mixed Protonic–Electronic Conductivity of Ba-Deficient, Pr-Substituted BaZr0.7Ce0.2Y0.1O3−δ

Recent advances in perovskites: Processing and properties

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About

Structures, Phase Fields, and Mixed Protonic–Electronic Conductivity of Ba-Deficient, Pr-Substituted BaZr_0.7Ce_0.2Y_0.1O_3−δ