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Issue 8, 2013
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Crystal structure, electrical conductivity and thermal expansion of Ni and Nb co-doped LaCoO3

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Abstract

The effect of co-doping LaCoO3 with Ni and Nb has been investigated in the two solid solution series (1 − x)LaCoO3xLaNi2/3Nb1/3O3 and (1 − y)LaCo2/3Ni1/3O3yLaNi2/3Nb1/3O3. The materials were shown to be stoichiometric with respect to oxygen. The compositional effect on the evolution of the crystal structure, thermal expansion and electrical conductivity is reported. The chemical stability of LaCoO3 in a reducing atmosphere was improved and the thermal expansion was suppressed at higher levels of Nb-substitution. The materials with mixed oxidation states on the B-site possessed superior electrical transport properties compared to solid solutions with cations in mainly isovalent oxidation states. The evolution of the electronic conductivity, thermal expansion and crystal structural is discussed with emphasis on the oxidation states of Ni and Co, and the spin transitions of Co.

Graphical abstract: Crystal structure, electrical conductivity and thermal expansion of Ni and Nb co-doped LaCoO3

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Publication details

The article was received on 09 Oct 2012, accepted on 30 Nov 2012 and first published on 30 Nov 2012


Article type: Paper
DOI: 10.1039/C2DT32399K
Citation: Dalton Trans., 2013,42, 2704-2715
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    Crystal structure, electrical conductivity and thermal expansion of Ni and Nb co-doped LaCoO3

    V. Øygarden and T. Grande, Dalton Trans., 2013, 42, 2704
    DOI: 10.1039/C2DT32399K

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