H2N2V1, Main, Exploration, bibRecord, 000F15

Synthesis and characterization of La1.5+xSr0.5xCo0.5Ni0.5O4 (x = 0, 0.2)

Identifieur interne : 000F15 ( Main/Exploration ); précédent : 000F14; suivant : 000F16

Synthesis and characterization of La1.5+xSr0.5xCo0.5Ni0.5O4 (x = 0, 0.2)

Auteurs : H. El Shinawi [Royaume-Uni] ; C. Greaves [Royaume-Uni]

Source :

Journal of Materials Chemistry [ 0959-9428 ] ; 2010.

RBID : ISTEX:C355CC91CB487FFE9A32D3EFA440040CB0C2D1E5

English descriptors

Teeft :
- Axial oxygen, Behaviour, Bond lengths, Cathode behaviour, Chem, Conventional perovskites, Coordination number, Coordination sphere, Crystal structure, Divalent state, Equatorial, Equatorial planes, Excess oxygen, Good agreement, Higher activation energies, Higher displacement, Higher energy side, Hyperstoichiometry, Ideal site, Interstitial, Interstitial oxygen, Lattice parameters, Magnetic order, Magnetic susceptibility, Mater, Neutron powder diffraction, Overall stoichiometries, Oxidation state, Oxidizing conditions, Oxygen hyperstoichiometry, Oxygen stoichiometry, Phys, Reduction behaviour, Resistivity, Resistivity measurements, Room temperature, Royal society, Semiconductive behaviour, Solid state chem, Solid state commun, Solid state ionics, Split position, Stable phases, Stoichiometry, Strontium doping, Susceptibility, Temperature data, Temperature range, Tetragonal structure, Tetragonal symmetry, Thermal activation energy, Thermogravimetric measurements, Whole temperature range, Wide range.

Abstract

The K2NiF4 phases La1.5+xSr0.5xCo0.5Ni0.5O4(+) (x = 0, 0.2) have been prepared by solid state reactions and structurally characterized by X-ray and neutron powder diffraction. The reduction behaviour, the magnetic properties and the electronic properties of these materials have also been examined. Oxygen hyperstoichiometry has been achieved in the lanthanum-rich phase La1.7Sr0.3Co0.5Ni0.5O4.08 with retention of the tetragonal symmetry. The excess oxygen occupies the ideal interstitial (0, 0.5, 0.25) sites of the tetragonal structure. The materials withstand reducing conditions (10% H2N2) up to 800 C via reduction of the B-site oxidation state to the divalent state (Ni2+/Co2+) and formation of oxide-ion vacancies within the equatorial planes of the structure. Formation of Ni1+ in these materials under reducing conditions is suggested to account for the oxygen stoichiometry and the magnetic behaviour of La1.5Sr0.5Co0.5Ni0.5O3.70. The electrical conductivity of the oxygen-rich semiconductor materials reaches a SOFC applicable limit (>100 S cm1) at elevated temperatures.

Url:

https://api.istex.fr/ark:/67375/QHD-SNC02KJB-V/fulltext.pdf

DOI: 10.1039/b913792k

Affiliations:

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Le document en format XML

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<term>Coordination number</term>
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<term>Magnetic order</term>
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<term>Oxygen stoichiometry</term>
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<term>Reduction behaviour</term>
<term>Resistivity</term>
<term>Resistivity measurements</term>
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<term>Semiconductive behaviour</term>
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<term>Strontium doping</term>
<term>Susceptibility</term>
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<term>Temperature range</term>
<term>Tetragonal structure</term>
<term>Tetragonal symmetry</term>
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<front><div type="abstract">The K2NiF4 phases La1.5+xSr0.5xCo0.5Ni0.5O4(+) (x = 0, 0.2) have been prepared by solid state reactions and structurally characterized by X-ray and neutron powder diffraction. The reduction behaviour, the magnetic properties and the electronic properties of these materials have also been examined. Oxygen hyperstoichiometry has been achieved in the lanthanum-rich phase La1.7Sr0.3Co0.5Ni0.5O4.08 with retention of the tetragonal symmetry. The excess oxygen occupies the ideal interstitial (0, 0.5, 0.25) sites of the tetragonal structure. The materials withstand reducing conditions (10% H2N2) up to 800 C via reduction of the B-site oxidation state to the divalent state (Ni2+/Co2+) and formation of oxide-ion vacancies within the equatorial planes of the structure. Formation of Ni1+ in these materials under reducing conditions is suggested to account for the oxygen stoichiometry and the magnetic behaviour of La1.5Sr0.5Co0.5Ni0.5O3.70. The electrical conductivity of the oxygen-rich semiconductor materials reaches a SOFC applicable limit (>100 S cm1) at elevated temperatures.</div>
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Synthesis and characterization of La1.5+xSr0.5xCo0.5Ni0.5O4 (x = 0, 0.2)

Synthesis and characterization of La1.5+xSr0.5xCo0.5Ni0.5O4 (x = 0, 0.2)

Source :

English descriptors

Abstract

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