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

被引：10

作者：

Yamamoto, A ^{[1
]}

Itoh, M ^{[1
]}

Fukuoka, A ^{[1
]}

Adachi, S ^{[1
]}

Yamauchi, H ^{[1
]}

Tanabe, K ^{[1
]}

机构：

[1] Int Superconduct Technol Ctr, Superconduct Res Lab, Koto Ku, Tokyo 135, Japan

来源：

JOURNAL OF MATERIALS RESEARCH | 1999年 / 14卷 / 03期

关键词：

D O I：

10.1557/JMR.1999.0089

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We systematically studied the temperature and time dependence of phase formation of HgBa2Can-1CunO2(n+1)+delta [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 de susceptibility measurement. A single-phase HgBa2CuO4+delta (Hg-1201) was obtained in a relatively wide temperature range (600-850 degrees C), while single-phase HgBa2CaCu2O6+8 (Hg-1212) and HgBa2Ca2Cu3O8+delta (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 degrees C, respectively, when the sintering time was fixed for about 50 h. The HgBa2Ca3Cu4O10+delta (Hg-1234) phase was obtained as a mixture with Hg-1223.

引用

页码：644 / 651

页数：8

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