The great flexibility of the rock salt layers in the lead-based 1212 high-Tc superconductive cuprates: The oxides (Pb, A)Sr[sub 2](Ca, Ln)Cu[sub 2]O[sub 7-[delta]]

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1005· OSTI ID:6772887

Maignan, A; Groult, D; Liu, R S; Rouillon, T; Daniel, P; Michel, C; Hervieu, M; Raveau, B ^[1]

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1. CRISMAT-ISMRa, Caen (France)

A systematic investigation of superconductivity based on 1212-type cuprates with nominal compositions (Pb[sub 0.5]A[sub 0.5])Sr[sub 2](Ca[sub 0.5]Y[sub 0.5])Cu[sub 2]O[sub 7-[delta]] with A = Cu, Zn, Ni, Mg, Cd, Ca, Sr and (Pb[sub 0.7]A[sub 0.3])Sr[sub 2](Ca[sub 0.5]Y[sub 0.5])Cu[sub 2]O[sub 7] with A = Sc, Fe has been carried out. It has been demonstrated that the different A cations enter into the structure, mainly in the rock salt type slabs, forming [(Pb[sub 1-x]A[sub x])O][sub [proportional to]] layers with an A content smaller than the nominal one. The study of the superconducting properties of these phases, and especially of their annealing properties at low temperature, shows that the critical temperatures of these phases, ranging from 30 to 90 K, are closely related to the nature of the A cations. The replacement of Y by Yb is also investigated. These results are discussed in terms of the size of the A cations, the oxygen nonstoichiometry, and the possible coexistence of the couples Pb(II)/Pb(IV) and Cu(II)/Cu(III).

• OSTI ID: 6772887
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 102:1; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
CUPRATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HIGH-TC SUPERCONDUCTORS
IONS
LEAD COMPOUNDS
LEAD OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS