Oxygen vacancy formation and defect structure of Cu-doped lanthanum chromite LaCrCuAlO

Zuev, A. Yu.; Singheiser, L.; Hilpert, K.

doi:10.1016/j.ssi.2004.08.003

Cited by 12 publications

(9 citation statements)

References 9 publications

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“…Although the electrical conductivities of the LSCCCu and LSCCNi bulks were higher than that of the LSCCV sample at higher oxygen partial pressure, the LSCCV bulk was more stable in low oxygen partial pressure. Zuev et al [19] reported that the acceptor dopant Cu on B-site changes its oxidation state continuously from 3+ via 2+ to 1+ if the oxygen partial pressure decreases. According to Yasuda et al [18], at low pO 2 , the conductivity of La 1−x Sr x Cr 1−y Ni y O 3 composition was described by the diffusion model with consideration of the effect of surface reaction.…”

Section: Methodsmentioning

confidence: 99%

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Properties of Cu, Ni, and V doped-LaCrO 3 interconnect materials prepared by pechini, ultrasonic spray pyrolysis and glycine nitrate processes for SOFC

et al. 2006

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The ceramic interconnect,La 0.8 Sr 0.05 Ca 0.15 (Cr 1−x , B x )O 3 (B = Cu, Ni, V, x = 0.02, 0.1, 0.5) (LSCCB) powders were prepared by Pechini method, Ultrasonic Spray Pyrolysis (USP) and Glycine Nitrate Process (GNP). Nano sized powders were synthesized by GNP and their chemical compositions were confirmed by ICP analysis. The electrical conductivities of LSCCCu, LSCCNi, and LSCCV samples were 34 S/cm, 48 S/cm, and 22 S/cm at 800 • C in air, respectively. Among the LSCCB powders, the LSCCNi sample shows highest relative density and electrical conductivity. In a low oxygen partial pressure, however, LSCCV sample was more stable. The perovskite phase of the composition LSCCV sample is of large practical interest for interconnects in SOFC because of the stability in low oxygen partial pressure.

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Section: Methodsmentioning

confidence: 99%

“…The LSCC has still high sintering temperature although its sintering temperature is lower than that of the LSC. Recently, several attempts have been also made to densify lanthanum chromites with B-site dopants [7][8][9][10][11][12]. Armstrong et al [13] is different from the present work in dopant Ca element and preparation method.…”

mentioning

confidence: 91%

Properties of Cu, Ni, and V doped-LaCrO 3 interconnect materials prepared by pechini, ultrasonic spray pyrolysis and glycine nitrate processes for SOFC

et al. 2006

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“…a linear dependence between composition and structural parameters. This expansion of the unit cell and the increase of cell parameters with increasing Co content can be attributed to the difference in effective ionic radius [39], because of their close correspondence to the physical size of ions in solids [43]. This effect produces a change and expansion in the structure due to the larger ionic radius of Co 2?…”

Section: Phase Characterization Of the Lacr 12x Co X O 3 Catalysts Pomentioning

confidence: 97%

Synthesis and Electrochemical Properties of LaCr1−xCoxO3 (0 ≤ x ≤ 0.5) via Co-precipitation Method

Madoui

Omari

2016

J Inorg Organomet Polym

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Perovskite LaCr 1-x Co x O 3 (0 B x B 0.5) oxides synthesized by co precipitation method were investigated. X-ray diffraction, thermo gravimetric and differential thermal analysis, Fourier transform infrared spectroscopy, scanning electron microscopy (SEM) and electrochemical measurements, were used to characterize the structure, morphology, electrochemical properties of the samples. The studied compounds have orthorhombic and rhombohedral systems in the ranges (0 B x B 0.2) and (0.3 B x B 0.5) respectively. Thermal analysis results indicate that the pure phase was obtained at temperature above 800°C. The structure and morphology of the samples characterized by SEM measurements indicate that particles have nearly spherical shapes and are agglomerated. The electrochemical measurements indicate that the catalytic activity is strongly influenced by cobalt doping. The highest electrode performance is achieved with large cobalt content.

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“…The second mechanism refers to changing coulombic forces because of the oxygen vacancy formation. Many research groups [28][29][30][31][32] have ascribed this chemical expansion as mainly being due to the dimensional effect, although others [26,27,33,34] have emphasized an insufficiency of the cation radius change to describe (quantitatively) the chemical expansion, and have suggested the involvement of other factors such as atomic packing, local structure, preferred coordination, association between dopants and vacancies, and a decrease in the binding energy of an oxide when the nonstoichiometry increases. As an example, Zuev et al [35] showed that the isothermal chemical expansion of a perovskite-type LaCoO 3Àd , parent composition for many promising mixed conductors, could be explicitly described by the mean ionic radius change within a relative narrow range of the nonstoichiometry variations [36].…”

Section: Thermal and Defects-induced (Chemical) Expansion Of Solidsmentioning

confidence: 99%

Defect Equilibria in Solids and Related Properties: An Introduction

Черепанов¹,

Петров

Zuev³

et al. 2009

Solid State Electrochemistry I

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Continuing the consideration of methodological aspects related to the analysis of electrochemical processes in solids, in this chapter is presented a brief overview of basic defect chemistry mechanisms and relationships between the defect thermodynamics and transport. The conceptual theoretical elements and fundamental relationships discussed here were established in classical reports made between the 1920s and 1960s (see, in particular, Refs. [1-14] and references cited therein). Progress during the following decades resulted in a deeper understanding of many particular systems and mechanisms involving defect chemistry, and in the development of a variety of advanced methods for their experimental study and simulations. It is commonly recognized that the simplest, limiting cases of defect reactions are rather exceptional; the description of defect formation-and diffusion-related processes in real systems often requires one to account for both short-and long-range defect interactions, the effects of the electronic subsystem, and microstructural and interfacial phenomena. These factors all lead to serious deviations from the hypothetic idealized situations. Nevertheless, approximate approaches still provide very useful tools, both for the researchers developing new materials and electrochemical systems, and for the newcomers to this scientific area. In this chapter are summarized some important definitions and formulae necessary to understand the solid-state electrochemical processes and research methodology; the discussion is based on examples relevant to numerous practical applications, such as fuel cells, batteries, and sensors.

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Oxygen vacancy formation and defect structure of Cu-doped lanthanum chromite LaCrCuAlO

Cited by 12 publications

References 9 publications

Properties of Cu, Ni, and V doped-LaCrO 3 interconnect materials prepared by pechini, ultrasonic spray pyrolysis and glycine nitrate processes for SOFC

Properties of Cu, Ni, and V doped-LaCrO 3 interconnect materials prepared by pechini, ultrasonic spray pyrolysis and glycine nitrate processes for SOFC

Synthesis and Electrochemical Properties of LaCr1−xCoxO3 (0 ≤ x ≤ 0.5) via Co-precipitation Method

Defect Equilibria in Solids and Related Properties: An Introduction

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