Encapsulation method for the synthesis of nearly single-phase superconducting HgBa2Ca2Cu3O8+δ with Tc≥ 135 K

Kazuyuki Isawa, Ayako Tokiwa-Yamamoto, Makoto Itoh, Seiji Adachi, H. Yamauchi

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71 Citations (Scopus)


Nearly single-phase polycrystalline samples of HgBa2Ca2Cu3O8+δ were successfully synthesized under relatively simple and unprecedented synthesis conditions, i.e. at a "low" temperature (<700°C) and for a "long" period of time (5-168h), using mono-oxide powders of Hg, Ba, Ca, and Cu as starting materials. A pressed powder mixture was heated at 665°C for ≈75 h in an evacuated fused quartz tube, and then post-annealed in flowing O2 gas to exhibit a Meissner signal below 135.4 K. Zero resistance of this sample was observed at 133.9 K.

Original languageEnglish
Pages (from-to)33-37
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue number1-2
Publication statusPublished - 1994 Mar 10
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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