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首页> 外文期刊>Physica, C. Superconductivity and its applications >The role of radiation damage structure and fine scale precipitation in the pinning improvement of thermal neutron irradiated lithium fluoride-doped YBa2Cu3O7-x
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The role of radiation damage structure and fine scale precipitation in the pinning improvement of thermal neutron irradiated lithium fluoride-doped YBa2Cu3O7-x

机译：辐射损伤结构和微尺度沉淀在热中子辐照氟化锂掺杂YBa2Cu3O7-x钉扎改进中的作用

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摘要

The improvement of intragranular critical current density, j(c), and flux pinning obtained by thermal neutron irradiation (fluences between 10(16) - 10(18) neutrons/cm(2)) in YBa2Cu3O7,(-x) doped with 8 mol% lithium fluoride (LiF) (YBCO-LIF) is explained by the occurrence of various irradiation defects (point defect clusters, dislocation loops, stacking faults) observed by transmission electron microscopy (TEM), A twin fading process is also revealed accompanied by a lowering of the orthorhombicity index. At higher irradiation fluences (similar to 5 x 10(17) 10(18) neutrons/cm(2)), a new mechanism related to the dispersion of fine Cu2O precipitates in the superconducting YBCO-LiF matrix could explain the enhancement of up to eight times obtained for j(c) values. A good agreement between the dependence of the measured j(c) values on the applied magnetic field and the calculated curves, j(c) = f(B), derived from a theoretical model, previously proposed for the pinning contribution of fine particles dispersed in YBCO matrix, is obtained. The role of thermal neutron irradiation for the flux pinning improvement by introducing of strong pinning centers (irradiation defects and Cu2O microdispersoids) is also discussed. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 29]
机译：掺杂8的YBa2Cu3O7，（-x）中热中子辐照获得的颗粒内临界电流密度j（c）和通量钉扎（通量在10（16）-10（18）中子/ cm（2）之间） mol％氟化锂（LiF）（YBCO-LIF）的解释是通过透射电子显微镜（TEM）观察到的各种辐照缺陷（点缺陷簇，位错环，堆垛层错）的出现，还揭示了双退色过程并伴随着降低正交性指标。在较高的辐照通量下（类似于5 x 10（17）10（18）中子/ cm（2）），与精细Cu2O沉淀物在超导YBCO-LiF基质中的分散有关的新机理可以解释获得j（c）值的八倍。测得的j（c）值对所施加磁场的依赖性与计算得出的曲线j（c）= f（B）之间的良好一致性，这是先前从理论模型得出的，用于分散细颗粒的钉扎作用在YBCO矩阵中，得到。还讨论了通过引入强钉扎中心（辐照缺陷和Cu2O微分散体）来改善中子辐照对通量钉扎的作用。 （C）1998 Elsevier Science B.V.保留所有权利。 [参考：29]

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