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

Research output: Contribution to journalArticle

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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
Publication statusPublished - 1999 Mar
Externally publishedYes

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Superconducting materials
time dependence
temperature dependence
Temperature
Quartz
temperature
sintering
purity
x ray diffraction
quartz
tubes
magnetic permeability
Sintering
Diffraction
synthesis
X rays

ASJC Scopus subject areas

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

Cite this

Yamamoto, A., Itoh, M., Fukuoka, A., Adachi, S., Yamauchi, H., & Tanabe, K. (1999). Temperature and time dependence of phase formation of HgBa2Can-1CunO2(n+1)+δ superconductors. Journal of Materials Research, 14(3), 644-651.

Temperature and time dependence of phase formation of HgBa2Can-1CunO2(n+1)+δ superconductors. / Yamamoto, Ayako; Itoh, Makoto; Fukuoka, Atsushi; Adachi, Seiji; Yamauchi, Hisao; Tanabe, Keiichi.

In: Journal of Materials Research, Vol. 14, No. 3, 03.1999, p. 644-651.

Research output: Contribution to journalArticle

Yamamoto, A, Itoh, M, Fukuoka, A, Adachi, S, Yamauchi, H & Tanabe, K 1999, 'Temperature and time dependence of phase formation of HgBa2Can-1CunO2(n+1)+δ superconductors', Journal of Materials Research, vol. 14, no. 3, pp. 644-651.
Yamamoto, Ayako ; Itoh, Makoto ; Fukuoka, Atsushi ; Adachi, Seiji ; Yamauchi, Hisao ; Tanabe, Keiichi. / Temperature and time dependence of phase formation of HgBa2Can-1CunO2(n+1)+δ superconductors. In: Journal of Materials Research. 1999 ; Vol. 14, No. 3. pp. 644-651.
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