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Low temperature synthesis, structure and properties of alkali-doped La2NiO4, LaNiO3 and LaNi0.85Cu0.15O3 from alkali hydroxide fluxes

Shivakumara, C and Hegde, MS and Prakash, AS and Khadar, AMA and Subbanna, GN and Lalla, NP (2003) Low temperature synthesis, structure and properties of alkali-doped La2NiO4, LaNiO3 and LaNi0.85Cu0.15O3 from alkali hydroxide fluxes. In: Solid State Sciences, 5 (2). pp. 351-357.

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Official URL: http://dx.doi.org/10.1016/S1293-2558(02)00056-0

Abstract

We report a low-temperature synthesis of La1.95Na0.05NiO4 from NaOH flux, La0.97K0.03NiO3 and La0.95K0.05Ni0.85Cu0.15O3 phases from KOH flux at 400 degreesC. Alkali-doped LaNiO3 can be prepared in KOH, but not in NaOH flux and La2NiO4 can be prepared in NaOH, but not in KOH flux. The flux-grown oxides were characterized by powder X-ray Rietveld profile analysis and electron microscopy. Sodium doped La2NiO4 crystallizes in orthorhombic structure and potassium doped LaNiO3-phases crystallizes in rhombohedral structure. La1.95Na0.05NiO4 is weakly paramagnetic and semiconducting while La0.97K0.03NiO3 and La0.95K0.05Ni0.85Cu0.15O3 show Pauli paramagnetic and metallic behavior. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Lanthanum nickel oxides;Alkali hydroxide fluxes;Cu- substituted LaNiO3;Alkali metal substitution
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 26 Aug 2011 10:46
Last Modified: 26 Aug 2011 10:46
URI: http://eprints.iisc.ernet.in/id/eprint/40131

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