Nb掺杂YBCO薄膜钉扎机理的研究  

Flux Pinning Mechanism of Nb-doped YBCO Film

作　　者：王雅 索红莉[1] 毛磊[1] 刘敏[1] 马麟[1] 王毅[1] KAUSAR Shaheen 周宇琦 WANG Ya;SUO Hong-Li;MAO Lei;LIU Min;MA Lin;WANG Yi;KAUSAR Shaheen;ZHOU Yu-Qi(The Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京工业大学材料科学与工程学院国家教育部功能材料重点实验室

出　　处：《无机材料学报》2019年第10期1055-1059,共5页Journal of Inorganic Materials

基　　金：北京市自然科学基金(2171008);国家自然科学基金(51571002);基带性能评估研究(GH-201809CG005);北京市教育委员会科技发展总项目(KM201810005010);科技创新服务能力建设–高精尖学科建设(市级)–材料科学与工程学科(PXM2019-014204-500031);北京市和北京工业大学211计划~~

摘　　要：通过低氟MOD法制备了Nb掺杂的YBa2Cu3O7–x(YBCO)薄膜,掺入的Nb以Ba2YNbO6(BYNO)相存在,其尺寸大小在20~30 nm之间,薄膜中BYNO纳米颗粒以外延和随机两种取向共存,且以随机取向为主。BYNO纳米颗粒的周围出现堆垛层错,并且BYNO周围的YBCO出现严重的晶格畸变,这增加了YBCO薄膜内部的微观应变,且随机BYNO颗粒含量越高, YBCO薄膜内部的微观应变就越大。微观应变增加了薄膜的磁通钉扎能力,进而提高了薄膜在高磁场下的超导性能。Nb doped YBa2Cu3O7–x(YBCO) film was fabricated by metal organic deposition (MOD) method. BYNO thin film composed of Nb element was obtained with the size ranged from 20-30 nm. It is indicated that the epitaxial and random oriented BYNO nanoparticles were coexisted in YBCO film and mainly shows random orientation. Strengthening of nanostrains can be attributed towards the stacking fault parallel to the film and the lattice distortion around the BYNO nanoparticles inside the thin film. As the random fraction of BYNO increasing, the nanostrain within nanocomposites was strengthened. The nanostrain increases the magnetic flux pinning ability of the film, thereby improving the superconducting properties of the film under high magnetic field.

关 键 词：YBCO薄膜 BYNO掺杂颗粒 随机取向 微观应变 钉扎能力 

分 类 号：TQ174[化学工程—陶瓷工业]