Two-zone annealing of Tl[sub 0. 5]Pb[sub 0. 5](Sr[sub 0. 8]Ba[sub 0. 2])[sub 2]Ca[sub 2]Cu[sub 3]O[sub [ital y]]

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · Journal of Materials Research; (United States)

DOI:https://doi.org/10.1557/JMR.1994.2470· OSTI ID:7018585

Aselage, T L; Venturini, E L; Voigt, J A; Lamppa, D L; Van Deusen, S B ^[1]

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1. Department 1153/MS 0345, Sandia National Laboratories, Albuquerque, New Mexico, 87185-0345 (United States)

Stable conditions have been identified for two-zone processing of the superconducting thallium cuprate Tl[sub 0.5]Pb[sub 0.5](Sr[sub 0.8]Ba[sub 0.2])[sub 2]Ca[sub 2]Cu[sub 3]O[sub [ital y]]. With [ital P](O[sub 2]) of 0.8 atm, [ital P](Tl[sub 2]O) of 4.4[times]10[sup [minus]3] atm, and a sample temperature of 920 [degree]C, single-phase Tl[sub 0.5]Pb[sub 0.5](Sr[sub 0.8]Ba[sub 0.2])[sub 2]Ca[sub 2]Cu[sub 3]O[sub [ital y]] is produced with a [ital T][sub [ital c]] of 115 K, complete diamagnetic shielding, and Meissner fraction greater than 70%. Although a small amount of melting occurs under these conditions, a comparison of the low-field diamagnetic shielding for these samples with samples of Pb- and Sr-free TlBa[sub 2]Ca[sub 2]Cu[sub 3]O[sub [ital y]] and Tl[sub 2]Ba[sub 2]Ca[sub 2]Cu[sub 3]O[sub [ital y]] suggests that such melting is not necessary to produce the triple-CuO[sub 2]-layer superconductors.

• DOE Contract Number: AC04-94AL85000
• OSTI ID: 7018585
• Journal Information: Journal of Materials Research; (United States), Journal Name: Journal of Materials Research; (United States) Vol. 9:10; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CUPRATES
DIAMAGNETISM
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
LEAD COMPOUNDS
LEAD OXIDES
MAGNETISM
MEISSNER-OCHSENFELD EFFECT
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE