High-pressure synthesis and heat treatments of the HgBa2Ca4Cu5O12+δ and HgBa2Ca5Cu6O14+δ phases

J. J. Capponi, E. M. Kopnin, S. M. Loureiro, E. V. Antipov, E. Gautier, C. Chaillout, B. Souletie, M. Brunner, J. L. Tholence, M. Marezio

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30 Citations (Scopus)

Abstract

The syntheses of the n = 5 and n = 6 members of the HgBa2Can-1CunO2n+2+δ family are reported. Bulk samples containing either Hg-1245 or Hg-1256 as major phases were synthesized using the high-pressure high-temperature technique at 920°C and 18 kbar. The as-synthesized phases (a = 3.8547(3) Å, c = 22.156(5) Å for n = 5 and a = 3.8516(1) Å, c = 25.232(6) Å for n = 6) exhibited Tc with onsets of about 100 K. They were characterized by X-ray powder diffraction, transmission electron microscopy and AC susceptibility measurements. Heat treatments increased the Tc onset to 110 K for n = 5 and to 107 K for n = 6. These phases with high n are more inert to thermal annealings under different atmospheres than the members with smaller n. Only strong oxidizing {P(O2) ≥ 500 bar} or reducing (Ar/400°C) conditions can induce significant Tc variations.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Volume256
Issue number1-2
DOIs
Publication statusPublished - 1 Jan 1996
Externally publishedYes

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