PREPARATION OF A CALCIUM-SUBSTITUTED COPPER-RICH YTTRIUM BARIUM COPPER-OXIDE SUPERCONDUCTOR FROM A SPRAY-DRIED NITRATE PRECURSOR

被引：6

作者：

GYUROV, G ^{[1
]}

KHRISTOVA, I ^{[1
]}

PESHEV, P ^{[1
]}

ABRASHEV, MV ^{[1
]}

机构：

[1] UNIV SOFIA,FAC PHYS,BU-1126 SOFIA,BULGARIA

来源：

MATERIALS RESEARCH BULLETIN | 1993年 / 28卷 / 10期

关键词：

YTTRIUM; BARIUM; CALCIUM; COPPER; OXIDES; NITRATES;

D O I：

10.1016/0025-5408(93)90145-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A calcium-substituted YBa2Cu4O8 (1-2-4) high-temperature superconductor is synthesized from a precursor obtained by spray-drying of a nitrate solution containing the corresponding metals in a stoichiometric ratio. The synthesis takes place during one-stage heat-treatment of the precursor at 800-degrees-C in an oxygen flow under a pressure of 1 atm within a relatively short period of time, additives as well as intermediate grinding and pressing of the products being not needed. Measurements of the a.c. susceptibility have revealed a very sharp superconducting transition which is comparable with that of samples prepared under a high pressure. The transition in Ca-substituted YBa2Cu4O8 occurs at a temperature by about 8 K higher than T(c) of the Ca-free phase. Raman spectra suggest that during the substitution calcium does not occupy barium positions in the YBa2Cu4O8 lattice.

引用

页码：1067 / 1074

页数：8

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