Synthesis and characterization of the superconducting cuprates (Pb,Cu)Sr sub 2 (Y,Ca)Cu sub 2 O sub z
- Superconductivity Research Laboratory, ISTEC, 10-13, Shinonome 1-chome, Koto-ku, Tokyo 135, Japan (JP)
Single-phase ceramics of superconducting Pb-based layered copper oxides (Pb{sub (1+{ital x})/2}Cu{sub (1{minus}{ital x})/2})Sr{sub 2} (Y{sub 1{minus}{ital x}}Ca{sub {ital x}})Cu{sub 2}O{sub {ital z}} ({ital x}=0--0.35 and {ital z}{congruent}7) are successfully synthesized in an oxidizing atmosphere. The compounds that contain appropriate amounts of Ca ({ital x}{gt}0.2) exhibit superconductivity when annealed in air and subsequently quenched into liquid nitrogen. The superconductivity transition temperature increases with increasing {ital x} and is raised to 52 K for nearly single-phase samples with {ital x}=0.4. It is shown that, when the sample with {ital x}=0.35 is quenched, the oxygen content {ital z} decreases from 7.10 to 6.99, which is practically equal to the stoichiometric value of 7. It is shown that the length of the {ital a} axis is nearly independent of the value of {ital x}, being constant at a fixed value for each set of as-sintered and quenched samples and that the {ital a} axis of the crystal is shrunken by quenching compared with that of a crystal slowly cooled.
- OSTI ID:
- 5692354
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:10; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL GROWTH
LEAD COMPOUNDS
LEAD OXIDES
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHASE STUDIES
PHYSICAL PROPERTIES
QUENCHING
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SYNTHESIS
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES