磁通钉扎
纳米晶
导电体
材料科学
超导电性
国防部
焊剂(冶金)
凝聚态物理
纳米技术
光电子学
临界电流
复合材料
物理
数学
组合数学
冶金
作者
L. Yang,Rongtie Huang,Xinghang Zhou,Jing Chen,Zhiyong Liu,Minjuan Li,Gang Wang,C.B. Cai
标识
DOI:10.1088/1361-6668/ad4a33
摘要
Abstract The added BaMO 3 (BMO, M = Zr, Hf) nanocrystals into REBa 2 Cu 3 O 7− δ (REBCO, RE = Y or other rare earth) superconducting films by the technology of preformed nanocrystal addition from colloidal precursor solutions have coarsened after sintering of the REBCO films, which limit the BMO size control and flux pinning enhancement. In the present work, the evolution of the size of BaHfO 3 (BHO) nanocrystals in the YBCO films is studied. The collection process of BHO nanocrystals is optimized to successfully separate BHO with an average size of 6 nm into two parts with average sizes of 4.5 nm and 7.7 nm, respectively. The evolution of three different BHO sizes in YBCO superconducting films with a thickness of 2.2 μ m and 10 mol% addition reveals that the small-size preformed nanocrystals decomposed at high temperatures to release Hf ions, resulting in the coarsening of other preformed BHO nanocrystals. After modulating the BHO size by reducing the amount of small-size BHO, the coarsening factor is reduced from 1.6 to 1.1, leading to a better in-field performance, especially at low temperatures. At 30 K@1 T, the critical current density ( J c ) of the 7.7 nm BHO-added YBCO increases by 23% and 50% than cases of 6 nm and 4.5 nm, respectively, being of great guiding value in the technology of performed nanocrystal addition.
科研通智能强力驱动
Strongly Powered by AbleSci AI