Direct observation and analysis of nanoscale precipitates in (Sm,Eu,Gd)Ba2Cu3Oy
Direct observation and analysis of nanoscale precipitates in (Sm,Eu,Gd)Ba2Cu3Oy
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DOI：
10.1063/1.1805709
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发表时间：
2004-10-18
影响因子：
4
通讯作者：
Murakami, M
中科院分区：
文献类型：
--
作者：
Muralidhar, M;Sakai, N;Murakami, M
我们采用原子分辨率的高角度环形暗场扫描透射电子显微镜来表征分散在熔融加工（Sm0.33Eu0.33Gd0.33）Ba 2Cu 3 Oy超导体中的纳米颗粒的化学组成和性质。我们发现了两种类型的稳定的纳米尺度的颗粒，小LRE-Ba_2CuZrO_y和（LRE，Zr）BaCuO_y（LRE=Sm，Eu，Gd）的，在10-60 nm的范围内，和较大的颗粒的Gd_2BaCuO_5“Gd-211”，在100 nm左右的大小。临界电流密度在90 K时有明显的增加。实验数据进行了解释，在添加剂钉扎的“大”的缺陷和点状障碍。纳米颗粒为大块高温超导磁体的生产开辟了新的视野。(C)2004年，美国物理学会。
We employed atomic-resolution high-angle annular dark-field scanning transmission electron microscope to characterize the chemical composition and nature of the nanoparticles dispersed in melt-processed (Sm0.33Eu0.33Gd0.33)Ba2Cu3Oy superconductor. We found two types of stable nanometer-scale particles, small LRE-Ba2CuZrOy and (LRE,Zr)BaCuOy (LRE=Sm,Eu,Gd) ones, in the 10-60 nm range, and larger particles of Gd2BaCuO5 "Gd-211," around 100 nm in size. A substantial increase of critical current density was observed up to 90 K. Experimental data were interpreted in terms of additive pinning by "large" defects and a point-like disorder. The nanosized particles open a new horizon for production of bulk high-T-c superconducting magnets. (C) 2004 American Institute of Physics.