Synthesis of the perovskite La{sub 2}CuTiO{sub 6} by ceramic and by sol-gel methods

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:141066

Palacin, M R; Fuertes, A; Casan-Pastor, N; Gomez-Romero, P ^[1]

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1. Institut de Ciencia de Materials de Barcelona (Spain)

The high Tc cuprate superconductors have renewed the interest for controlling the distribution of metals in mixed perovskites of copper and other metals. But despite the large number of mixed perovskite oxides of formula A{sub 2}BB`O{sub 6} prepared over the years, the problem of the ordering of ions B and B` is only partly understood. Thus, a novel layered perovskite of formula La{sub 2}CuSnO{sub 6} has been recently characterized, whereas the similar SrLaCuSbO6 presents a {open_quotes}Na-Cl{close_quotes} type ordered structure. The oxide La{sub 2}CuTiO{sub 6} also presents the perovskite structure and is closely related to the Cu-Sn compound, but no definitive evidence of the Cu-Ti ordering has been given in the literature. Only a cubic phase has been reported with no apparent superstructure peaks. The authors present the synthesis by classic ceramic method and by a alternative sol-gel route of a new distorted perovskite phase of composition La{sub 2}CuTiO{sub 6} (orthorhombic, a=5.55, b=5.61, c=7.83{angstrom}) related to the GdFeO{sub 3} structure. The authors have studied the X-ray diffraction pattern and the magnetic properties of this oxide to determine the possible ordering of Cu and Ti.

• OSTI ID: 141066
• Report Number(s): CONF-930304--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
CERAMICS
CRYSTAL STRUCTURE
CUPRATES
HIGH-TC SUPERCONDUCTORS
LANTHANUM OXIDES
PEROVSKITES
PHASE STUDIES
SOL-GEL PROCESS
SYNTHESIS
TITANATES