SYNTHESIS AND CHARACTERIZATION OF HGBA2CAN-1CUNO2N+2+DELTA (N=1, 2, AND 3)

被引：40

作者：

CHMAISSEM, O

WESSELS, L

SHENG, ZZ

机构：

[1] UNIV ARKANSAS,DEPT PHYS,FAYETTEVILLE,AR 72701

[2] UNIV ARKANSAS,CTR HIGH DENS ELECTR,FAYETTEVILLE,AR 72701

来源：

PHYSICA C | 1994年 / 230卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(94)90834-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have successfully prepared the first three members of the mercury-based superconducting compounds Hg-Ba2Can-1CunO2n+2+delta, namely Hg-1201, Hg-1212 and Hg-1223 with high purity and very good quality. The influence of the synthesis parameters is studied in detail. Using the sealed quartz tube method, very simple procedures are found to ensure a 100% reproducibility of nearly 100% pure Hg-1201 and 85-90% Hg-1212 and Hg-1223. Oxygen annealing of the sample Hg-1201 at 300-degrees-C for 18 h results in an enhancement of its critical temperature up to 97 K. The symmetry of the first and second members is tetragonal with lattice parameters a = 3.8831 (1) angstrom, c = 9.5357 (2), and a = 3.8624 (1) angstrom, c = 12.7045 (2) angstrom, respectively. X-ray diffraction lines of Hg-1223 can be indexed in a tetragonal cell with a = 3.8564(1) angstrom and c = 15.8564(9) angstrom as well as in an orthorhombic cell with lattice parameters a = 5.4537(1) angstrom, b = 5.4247 (1) angstrom, and c = 15.8505 (7) angstrom.

引用

页码：231 / 238

页数：8

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