Synthesis of superconductor oxide ceramics by combustion of carbon nanoparticles

被引:0
作者
Martirosyan, K. S. [1 ]
Galstyan, E. [2 ]
Xue, Y. Y. [2 ]
Luss, D. [1 ]
机构
[1] Univ Houston, Dept Chem & Biomol Engn, 4800 Calhoun, Houston, TX 77204 USA
[2] Univ Houston, Texas Ctr Super, Houston, TX 77204 USA
来源
TMS 2008 ANNUAL MEETING SUPPLEMENTAL PROCEEDINGS, VOL 1: MATERIALS PROCESSING AND PROPERTIES | 2008年
关键词
superconductor oxide; YBCO; carbon combustion synthesis; current density;
D O I
暂无
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We report a novel cost-effective and simple method to produce superconductor YBa2Cu3O7-delta (YBCO) powder by a self-sustaining one step process, named Carbon Combustion Synthesis of Oxides (CCSO). In this process the exothermic oxidation of carbon nanoparticles generates a thermal reaction wave that propagates at a velocity of about 1 mm/s through the solid reactant Y2O3, BaO2, CuO mixture, converting it rapidly (order of seconds) to YBCO. The carbon is not incorporated in the product and is emitted as CO2 from the sample generating a highly porous (similar to 70%) and friable product. Most of the grains have a plate-like shape, are well connected and have a size distribution ranging from 1 to 3 mu m. Carbon analysis indicated that the concentration of the residual carbon was less than 0.06 wt %. The magnetization of as-synthesized samples, determined by SQUID magnetometer showed an onset of superconducting (SC) transition at similar to 91 K, with a 44% shielding fraction of the -1/(4 pi) value.
引用
收藏
页码:521 / +
页数:2
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