Crystal structure, electrical conductivity and thermal expansion of Ni and Nb co-doped LaCoO_3

?ygarden V.; Grande T.

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Crystal structure, electrical conductivity and thermal expansion of Ni and Nb co-doped LaCoO_3

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The effect of co-doping LaCoO_3 with Ni and Nb has been investigated in the two solid solution series (1 - x)LaCoO_3- xLaNi_(2/3)Nb_(1/3)O_3 and (1 - y)LaCo _(2/3)Ni_(1/3)O_3-yLaNi_(2/3)Nb _(1/3)O_3. 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 LaCoO_3 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.

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《Dalton transactions: An international journal of inorganic chemistry》 |2013年第8期|2704-2715|共12页
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?ygarden V.; Grande T.;
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Department of Materials Science and Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway;

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正文语种英语
中图分类化学;
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Crystal structure, electrical conductivity and thermal expansion of Ni and Nb co-doped LaCoO_3

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