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

doi:10.1557/JMR.1999.0089

Temperature and time dependence of phase formation of HgBa₂Ca_n-1Cu_nO₂(n+1)+δ superconductors

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

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

We systematically studied the temperature and time dependence of phase formation of HgBa₂Ca_n-1Cu_nO_2(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 HgBa₂CuO_4+δ (Hg-1201) was obtained in a relatively wide temperature range (600-850 °C), while single-phase HgBa₂CaCu₂O₆₊₈ (Hg-1212) and HgBa₂Ca₂Cu₃O_8+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 HgBa₂Ca₃Cu₄O_10+δ (Hg-1234) phase was obtained as a mixture with Hg-1223.

Original language	English
Pages (from-to)	644-651
Number of pages	8
Journal	Journal of Materials Research
Volume	14
Issue number	3
DOIs	https://doi.org/10.1557/JMR.1999.0089
Publication status	Published - 1999 Mar
Externally published	Yes

ASJC Scopus subject areas

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

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

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.",

author = "Ayako Yamamoto and Makoto Itoh and Atsushi Fukuoka and Seiji Adachi and Hisao Yamauchi and Keiichi Tanabe",

note = "Funding Information: This work was supported by NEDO for the R&D of Industrial Science and Technology Frontier Program.",

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T1 - Temperature and time dependence of phase formation of HgBa2Can-1CunO2(n+1)+δ superconductors

AU - Yamamoto, Ayako

AU - Itoh, Makoto

AU - Fukuoka, Atsushi

AU - Adachi, Seiji

AU - Yamauchi, Hisao

AU - Tanabe, Keiichi

N1 - Funding Information: This work was supported by NEDO for the R&D of Industrial Science and Technology Frontier Program.

PY - 1999/3

Y1 - 1999/3

N2 - 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.

AB - 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.

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Temperature and time dependence of phase formation of HgBa₂Ca_n-1Cu_nO₂(n+1)+δ superconductors

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