Oxygen nonstoichiometry and properties of lanthanum nickelates La3−xCaxNi2O7−δ (0 ≤ x ≤ 2.0)

Complex rare-earth nickelates La3−xCaxNi2O7−δ (0≤x≤2.0) were produced using coprecipitation followed by calcination of the obtained blend. We have determined the stability range for the solid solution and the fraction δ of non-stoichiometric oxygen, using powder X-ray diffraction and chemical analys...

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Veröffentlicht in:	Journal of alloys and compounds 2004-03, Vol.367 (1-2), p.251-254
Hauptverfasser:	Nedilko, S.A, Kulichenko, V.A, Dziazko, A.G, Zenkovich, E.G
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Cross-disciplinary physics: materials science rheology Electronic transport in condensed matter Exact sciences and technology Materials science Materials synthesis materials processing Methods of materials synthesis and materials processing Mixed conductivity and conductivity transitions Nickelates (A) Oxygen nonstoichiometry (C) Physics Solid solution (B)
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Zusammenfassung:	Complex rare-earth nickelates La3−xCaxNi2O7−δ (0≤x≤2.0) were produced using coprecipitation followed by calcination of the obtained blend. We have determined the stability range for the solid solution and the fraction δ of non-stoichiometric oxygen, using powder X-ray diffraction and chemical analysis. It is shown that the stability range for these solid solutions correlates with the oxygen content in the samples. Substitution of lanthanum by calcium changed the conductivity type from metal (x=0) to semiconductor (0.2≤x≤0.8).
ISSN:	0925-8388 1873-4669
DOI:	10.1016/j.jallcom.2003.08.047