Lattice thermal expansion of LaCo1−xCuxO3

Ramaswamy, V.; Awati, Preeti; Tyagi, A. K.

doi:10.1016/s0925-8388(03)00496-1

Cited by 21 publications

(6 citation statements)

References 4 publications

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“…Earlier works has shown that lattice parameters are temperature dependent. Expansion of lattice and particle size are in accordance with increase in temperature [24]. In this work we found that crystallite size of ZnO nanoparticles increased as T s increased for sample deposited on Si and Si/Au.…”

Section: Xrdsupporting

confidence: 71%

ZnO Nanoparticles on Si, Si/Au, and Si/Au/ZnO Substrates by Mist‐Atomisation

Khusaimi

Mamat

Abdullah

et al. 2011

Journal of Nanomaterials

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ZnO nanoparticles were prepared on Si substrates by a mist-atomisation technique. Precursor of aqueous solution zinc nitrate and HMTA were released on substrates heated at 200, 300, and400°Cconfined in chamber box. The surface of Si substrate was varied, that is, gold-seeded Si (Si/Au), ZnO nanorods on Si/Au (Si/Au/ZnO), and just Si. The samples were subsequently analysed by X-ray diffraction, scanning electron microscopy, and photoluminescence (PL) spectroscopy to study their structural, surface morphology, and PL emission properties. Analysis from the XRD patterns of the films showed stronga-andc-axis lattice and of pure ZnO hexagonal wurtzite type. The crystallite size varied from 6 to 43 nm and was found to generally increase with increasing substrates' temperatures (Ts). SEM micrographs revealed granular-like structure throughout. Shifts pattern of PL emission at ultraviolet and visible range was found to support size changes observed. Both substrate surface type and deposition temperature were found to significantly affect crystalline growth of ZnO nanoparticles. Chemical equations and justification for growth patterns are also suggested.

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Section: Xrdsupporting

confidence: 71%

ZnO Nanoparticles on Si, Si/Au, and Si/Au/ZnO Substrates by Mist‐Atomisation

Khusaimi

Mamat

Abdullah

et al. 2011

Journal of Nanomaterials

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“…The Mn−O bond is covalent while the Ce−O bond is ionic in nature due to Ce being more electropositive. It is known that ionic solids have higher α a compared to covalent solids . Thus, Mn incorporation in the ceria lattice affects α a .…”

Section: Resultsmentioning

confidence: 99%

Nature of Manganese Species in Ce₁_-_xMn_xO_2-_δ Solid Solutions Synthesized by the Solution Combustion Route

Murugan¹,

Ramaswamy²,

Srinivas³

et al. 2005

Chem. Mater.

196

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A series of manganese-cerium oxide composites with Mn concentrations in the range of 1-20 mol % in ceria was prepared by the solution combustion technique using urea as fuel. The nature, type, and oxidation state of Mn species in ceria were investigated by X-ray diffraction (XRD), diffuse reflectance UV-visible spectroscopy, electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy, and temperature-programmed reduction techniques. The study reveals that the method of preparation significantly influences the type of manganese species in ceria. Wet-impregnation, coprecipitation, and solid-state synthesis techniques lead to clustered MnO x -like species in the ceria matrix, while the present method of preparation (solution combustion route) yields a highly dispersed form of Mn species. In the reported series of samples, Mn is present mainly in +2 and +3 oxidation states and there is no evidence for the presence of Mn 4+ species. Powder X-ray diffraction studies at variable temperatures (298-1323 K) indicate the formation of Ce 1-x Mn x O 2-δ solid solutions. No separate MnO x -type phase was detected even at 1323 K. EPR studies reveal that the isolated Mn 2+ and Mn 3+ species are present in at least three different structural locations: species A, Mn ions in ceria-lattice defect sites; species B, Mn ions in framework Ce 4+ locations; and species C, Mn ions in interstitial locations and at the surface of ceria. The Mn 3+ ions in ceria exhibit a facile reduction and reoxidation behavior when exposed to dry hydrogen and subsequently to air at elevated temperatures. A highly dispersed state of Mn 3+ and Mn 2+ in ceria, facile redox behavior, and a synergistic Mn-ceria interaction are some of the unique properties of this material prepared by the solution combustion procedure.

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“…Furthermore, copper can effectively decrease the TEC and the calcining temperature of the materials [22,23]. Nevertheless, they have never been reported, to the best of our knowledge, as anode of SOFC.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A cobalt-free electrode material La0.5Sr0.5Fe0.8Cu0.2O3−δ for symmetrical solid oxide fuel cells

Yin

et al. 2015

Electrochemistry Communications

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Lattice thermal expansion of LaCo1−xCuxO3

Cited by 21 publications

References 4 publications

ZnO Nanoparticles on Si, Si/Au, and Si/Au/ZnO Substrates by Mist‐Atomisation

ZnO Nanoparticles on Si, Si/Au, and Si/Au/ZnO Substrates by Mist‐Atomisation

Nature of Manganese Species in Ce₁_-_xMn_xO_2-_δ Solid Solutions Synthesized by the Solution Combustion Route

A cobalt-free electrode material La0.5Sr0.5Fe0.8Cu0.2O3−δ for symmetrical solid oxide fuel cells

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Lattice thermal expansion of LaCo1−xCuxO3

Cited by 21 publications

References 4 publications

ZnO Nanoparticles on Si, Si/Au, and Si/Au/ZnO Substrates by Mist‐Atomisation

ZnO Nanoparticles on Si, Si/Au, and Si/Au/ZnO Substrates by Mist‐Atomisation

Nature of Manganese Species in Ce1-xMnxO2-δ Solid Solutions Synthesized by the Solution Combustion Route

A cobalt-free electrode material La0.5Sr0.5Fe0.8Cu0.2O3−δ for symmetrical solid oxide fuel cells

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Nature of Manganese Species in Ce₁_-_xMn_xO_2-_δ Solid Solutions Synthesized by the Solution Combustion Route