Nanostructured high-temperature superconductors: Creation of strong-pinning columnar defects in nanorod/superconductor composites
説明
<jats:p>A chemical approach to the formation of columnar defects involving the growth and incorporation of MgO nanorods into high temperature superconductors (HTS's) has been developed. MgO nanorods were incorporated into Bi<jats:sub>2</jats:sub>Sr<jats:sub>2</jats:sub>CaCu<jats:sub>2</jats:sub>O<jats:sub><jats:italic>z</jats:italic></jats:sub>, Bi<jats:sub>2</jats:sub>Sr<jats:sub>2</jats:sub>Ca<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub><jats:italic>z</jats:italic></jats:sub>, and Tl<jats:sub>2</jats:sub>Ba<jats:sub>2</jats:sub>Ca<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub><jats:italic>z</jats:italic></jats:sub> superconductors at areal densities up to 2 × 10<jats:sup>10</jats:sup>/cm<jats:sup>2</jats:sup>. Microstructural analyses of the composites demonstrate that the MgO nanorods create a columnar defect structure in the HTS matrices, form a compositionally sharp interface with the matrix, and self-organize into orientations perpendicular and parallel to the copper oxide planes. Measurements of the critical current density demonstrate significant enhancements in the MgO nanorod/HTS composites at elevated temperatures and magnetic fields compared with reference samples.</jats:p>
収録刊行物
-
- Journal of Materials Research
-
Journal of Materials Research 12 (11), 2981-2996, 1997-11
Springer Science and Business Media LLC
