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

Published online by Cambridge University Press:  31 January 2011

Ayako Yamamoto ,
Makoto Itoh ,
Atsushi Fukuoka ,
Seiji Adachi ,
Hisao Yamauchi  and
Keiichi Tanabe
Ayako Yamamoto*
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1–10–13 Shinonome, Koto-ku, Tokyo 135, Japan
Makoto Itoh
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1–10–13 Shinonome, Koto-ku, Tokyo 135, Japan
Atsushi Fukuoka
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1–10–13 Shinonome, Koto-ku, Tokyo 135, Japan
Seiji Adachi
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1–10–13 Shinonome, Koto-ku, Tokyo 135, Japan
Hisao Yamauchi
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1–10–13 Shinonome, Koto-ku, Tokyo 135, Japan
Keiichi Tanabe
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1–10–13 Shinonome, Koto-ku, Tokyo 135, Japan
*
a)Address all correspondence to this author. e-mail: yamamoto@istec.or.jp
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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.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 3 , March 1999 , pp. 644 - 651
Copyright
Copyright © Materials Research Society 1999

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