Metallic and non-superconducting phases in LnBa{sub 2}Cu{sub 3-x}Ni{sub x}O{sub 7+{sigma}} oxides

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1994.1305· OSTI ID:508690

Manoharan, S S; Ramesh, S; Hegde, M S; Subbanna, G N ^[1]

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1. Indian Inst. of Science, Bangalore (India)

A series of compounds LaBa{sub 2}Cu{sub 3-x}Ni{sub x}O{sub 7{+-}{delta}} (0.0 < x < 0.3) and LnBa{sub 2}Cu{sub 3-x}Ni{sub x}O{sub 7-{delta}} (Ln123; Ln = Pr, Nd, Sm, Gd, and Er; x = 0.1, 0.2) has been synthesized by a ceramic method and their structure characterized by X-ray and electron diffraction. The substitution of nickel in LaBa{sub 2}Cu{sub 3}O{sub 7{+-}{delta}} (La123) induces an orthorhombic to tetragonal structural transition as well reducing the activation energy for oxygen desorption. Orthorhombicity increased with decreasing lanthanide ion radius in the LnBa{sub 2}Cu{sub 2.9}Ni{sub 0.1}O{sub 7{+-}{delta}} system. Electrical resistivity measurements show metallic behavior down to 4.2 K for LaBa{sub 2}Cu{sub 3-x}Ni{sub x}O{sub 7{+-}{delta}} (0.1 < x < 0.3). The superconducting transition temperatures of Ni-doped Ln123 decreased with increasing rare earth ion radius, for the same nickel content. These properties are discussed in terms of the Ni{sup 3+} ion occupying the Cu(1) sites in La123 stabilized by a larger La{sup 3+} ion and Ni{sup 2+} ion occupying the Cu(2) sites in the Ln123 system of oxides.

• OSTI ID: 508690
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 112; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
BARIUM COMPOUNDS
CUPRATES
ELECTRIC CONDUCTIVITY
ELECTRON DIFFRACTION
NICKEL COMPOUNDS
ORTHORHOMBIC LATTICES
PHASE STUDIES
RARE EARTH COMPOUNDS
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TETRAGONAL LATTICES
X-RAY DIFFRACTION