Stabilization of the mixed valence Cu(III)/Cu(IV) in the perovskite lattice of La{sub 1-x}Sr{sub x}CuO{sub 3} under high oxygen pressure

Journal Article · Sat Dec 31 23:00:00 EST 1994 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1995.1013· OSTI ID:552729

Darracq, S; Demazeau, G ^[1]; Choy, J H; Kang, S G ^[2]

---

1. Universite Bordeaux, Talence (France)
2. Seoul National Univ. (Korea, Republic of)

A new mixed valence Cu(III)/Cu(IV) has been stabilized in the three-dimensional lattice of the perovskite-type oxide La{sub 1-x}Sr{sub x}CuO{sub 3}(O{le}x{le}0.25). Chemical analysis and XPS studies confirm the mixed valence. This compound shows metallic properties with a broadening of the conduction band compared to that of LaCuO{sub 3}. Such behavior can be explained either by the increase of the covalence of the average Cu-O bond or by the decrease of the structural distortion induced by the substitution of Sr(II) for La(III). No superconducting property has been detected in the material to temperatures as low as 4 K.

• OSTI ID: 552729
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 114; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL ANALYSIS
COPPER IONS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRICAL PROPERTIES
LANTHANUM OXIDES
MAGNETIC PROPERTIES
PHOTOELECTRON SPECTROSCOPY
STRONTIUM OXIDES
VALENCE
X-RAY DIFFRACTION