Temperature and time dependence of phase formation of HgBa2Can-1CunO2(n+1)+δ superconductors

Ayako Yamamoto, Makoto Itoh, Atsushi Fukuoka, Seiji Adachi, Hisao Yamauchi, Keiichi Tanabe

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Abstract

We systematically studied the temperature and time dependence of phase formation of HgBa2Can-1CunO2(n+1)+δ [Hg-12(n-1)n, n = 1, 2, 3, 4] superconductors by a single step firing method. All samples were synthesized from high-purity HgO, BaO, CaO, and CuO in a sealed quartz tube. The phase formation of Hg-12(n - 1)n was examined by both x-ray diffraction (XRD) analysis and dc susceptibility measurement. A single-phase HgBa2CuO4+δ (Hg-1201) was obtained in a relatively wide temperature range (600-850 °C), while single-phase HgBa2CaCu2O6+8 (Hg-1212) and HgBa2Ca2Cu3O8+δ (Hg-1223) were obtained only in narrow temperature and time ranges for the synthesis. The optimum temperatures for Hg-1212 and Hg-1223 were found to be 665 and 710 °C, respectively, when the sintering time was fixed for about 50 h. The HgBa2Ca3Cu4O10+δ (Hg-1234) phase was obtained as a mixture with Hg-1223.

Original languageEnglish
Pages (from-to)644-651
Number of pages8
JournalJournal of Materials Research
Volume14
Issue number3
DOIs
Publication statusPublished - 1999 Mar

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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