A new mercury-based superconductor with a [Tc] of 132 K [Hg[sub 0. 5]Tl[sub 0. 5]Ba[sub 2](Ca[sub 1[minus]x]Sr[sub x])[sub 2]Cu[sub 3]O[sub 8+[delta]]]

Journal Article · Thu Sep 01 00:00:00 EDT 1994 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(94)90056-6· OSTI ID:7018065

Hur, N H; Kim, N H; Lee, K W; Park, Y K; Park, J C ^[1]

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1. Korea Research inst. of Standards and Science, Taejon (Korea, Republic of)

A new mercury-based superconductor Hg[sub 0.5]Tl[sub 0.5]Ba[sub 2](Ca[sub 1[minus]x]Sr[sub x])[sub 2]Cu[sub 3]O[sub 8+[delta]] (x = 0.14, denoted as Hg,Tl-1223) was prepared by solid state reaction of HgO, Tl[sub 2]O[sub 3], Ba[sub 2]CuO[sub 3+x], and Ca[sub 1[minus]x]Sr[sub x]CuO[sub 2]. X-ray powder diffraction analysis revealed that the Hg,Tl-1223 is isostructural with pristine HgBa[sub 2](Ca[sub 1[minus]x]Sr[sub x])[sub 2]Cu[sub 3]O[sub 8+[delta]]. The crystal symmetry is tetragonal with a space group of P4/mmm, and lattice parameters of a = 3.8649(1) [angstrom] and c = 15.9573(2) [angstrom]. The [Tc] for the as-synthesized sample is about 128 K. After annealing the sample in an argon atmosphere at 400 C for 6 h, the [Tc] has been found to increase to 132 K. In contrast to other mercury-based superconductors, HgBa[sub 2]Ca[sub n[minus]1]Cu[sub n]O[sub 2n+2+[delta]] (n = 1, 2, 3), the Hg,Tl-1223 compound is quite stable even at 500 C in oxygen and argon atmospheres. The Tl substitution at the Hg site appears to stabilize the Hg,Tl-1223 phase and enhance pinning. The critical current density of the Hg,Tl-1223 obtained from the magnetic hysteresis loops is approximately twice larger than that of pristine HgBa[sub 2](Ca[sub 1[minus]x]Sr[sub x])[sub 2]Cu[sub 3]O[sub 8+[delta]].

• OSTI ID: 7018065
• Journal Information: Materials Research Bulletin; (United States), Vol. 29:9; ISSN 0025-5408
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
BARIUM OXIDES
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360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)