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 language | English |
|---|---|
| Pages (from-to) | 644-651 |
| Number of pages | 8 |
| Journal | Journal of Materials Research |
| Volume | 14 |
| Issue number | 3 |
| Publication status | Published - 1999 Mar |
| Externally published | Yes |
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ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
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 journal › Article
}
TY - JOUR
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
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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M3 - Article
VL - 14
SP - 644
EP - 651
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 3
ER -