TY  - JOUR
AU  - Bretos, Iñigo
AU  - Schneller, Theodor
AU  - Falter, Martina
AU  - Bäcker, Michael
AU  - Hollmann, Eugen
AU  - Wördenweber, Roger
AU  - Molina-Luna, Leopoldo
AU  - Van Tendeloo, Gustaaf
AU  - Eibl, Oliver
TI  - Solution-derived YBa $_{2}$ Cu $_{3}$ O $_{7−δ}$ (YBCO) superconducting films with BaZrO $_{3}$ (BZO) nanodots based on reverse micelle stabilized nanoparticles
JO  - Journal of materials chemistry / C
VL  - 3
IS  - 16
SN  - 2050-7534
CY  - London {[u.a.]
PB  - RSC
M1  - FZJ-2015-05419
SP  - 3971 - 3979
PY  - 2015
AB  - Superconducting YBa2Cu3O7-delta (YBCO) films with artificial BaZrO3 (BZO) nanodots were prepared using a chemical solution deposition method involving hybrid solutions composed of trifluoroacetate-based YBCO precursors and reverse micelle stabilized BZO nanoparticle dispersions. Microemulsion-mediated synthesis was used to obtain nano-sized (similar to 12 nm) and mono-dispersed BZO nanoparticles that preserve their features once introduced into the YBCO solution, as revealed by dynamic light scattering. Phase pure, epitaxial YBCO films with randomly oriented BZO nanodots distributed over their whole microstructure were grown from the hybrid solutions on (100) LaAlO3 substrates. The morphology of the YBCO-BZO nanocomposite films was strongly influenced by the amount of nanoparticles incorporated into the system, with contents ranging from 5 to 40 mol%. Scanning electron microscopy showed a high density of isolated second-phase defects consisting of BZO nanodots in the nanocomposite film with 10 mol% of BZO. Furthermore, a direct observation and quantitative analysis of lattice defects in the form of interfacial edge dislocations directly induced by the BZO nanodots was evidenced by transmission electron microscopy. The superconducting properties (77 K) of the YBCO films improved considerably by the presence of such nanodots, which seem to enhance the morphology of the sample and therefore the intergranular critical properties. The incorporation of preformed second-phase defects (here, BZO) during the growth of the superconducting phase is the main innovation of this novel approach for the all-solution based low-cost fabrication of long-length coated conductors.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000352870400018
DO  - DOI:10.1039/C4TC02543A
UR  - https://juser.fz-juelich.de/record/203498
ER  -