In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 6, No. 7 ( 1991-07), p. 1415-1424
Abstract:
Superconducting Tl–Ca–Ba–Cu–oxide films have been prepared on yttria stabilized zirconia substrates via the reaction of Tl 2 O vapor with precursor Ca–Ba–Cu–oxide films prepared by the spray pyrolysis of a solution of the metal nitrates. The vapor reaction process, evaluated in both air and oxygen ambients, was carried out in a two-zone reactor which permitted the independent control of the temperatures of the sample and of a boat containing thallium oxide. Sample temperatures of 865–905 °C and boat temperatures of 775–870 °C were investigated. X-ray diffraction analysis of the best samples, which were prepared in an oxygen ambient at sample temperatures of 895–900 °C and boat temperatures of 805–810 °C, revealed the presence of a highly oriented Tl 2 Ca 2 Ba 2 Cu 3 O 10+ y phase with a trace of the Tl 2 CaBa 2 Cu 2 O 8+ y phase. FWHM's of ∼2°θ were obtained in x-ray rocking curve analyses of the oriented 2223 phase. T c (0) values of 95–105 K were measured for the better samples, and a zero field critical current density of 28 800 amps/cm 2 was measured at 77 K for the best sample. SEM micrographs taken of the highest J c samples reveal a highly textured structure consisting of platelike crystals.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/JMR.1991.1415
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
1991
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
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