ISLAND GROWTH OF Y2BaCuO5 NANOPARTICLES IN (211~1.5 nm/123~10 nm)XN COMPOSITE MULTILAYER STRUCTURES TO ENHANCE FLUX PINNING OF YBa2Cu3O7–δ FILMS

AFRL-PR-WP-TP-2006-231 ISLAND GROWTH OF Y2BaCuO5 NANOPARTICLES IN (211~1.5 nm/123~10 nm)XN COMPOSITE MULTILAYER STRUCTURES TO ENHANCE FLUX PINNING OF YBa2Cu3O7–δ FILMS

Nano-composite single grain YBa2Cu3O7-δ / Y2Ba4CuBiOy bulk superconductors

We have succeeded recently in synthesizing a chemically stable, inert family of materials of composition Y2Ba4CuMOy (Y-2411 where M = Nb, Ta, Mo, W, Zr, Hf) within the superconducting YBa2Cu3O7-δ• (Y-123) phase matrix that forms effective flux pinning centers of nano-scale dimensions. In this paper we report the synthesis of the Y2Ba4CuBiOy phase with nano-scale dimensions that is similarly com...

اثر نانو ذرات نقره به عنوان مراکز میخکوبی شار در ابررسانای YBa2cu3o7-δ

  The objective of this work is to investigate the effect of Ag nanoparticles as the flux pinning centers. Ag nanoparticles with different particle sizes from 30 to 1000 nm were prepared through the chemical reduction of AgNO3 in an alcohol solution. Then, samples of YBa2Cu3O7-δ superconductors were doped by 1 and 2 weight percentage of Ag nanoparticles with different sizes. Samples were charac...

Flux Pinning Effects of Y2o3 Nanoparticulate Dispersions in Multilayered Ybco Thin Films (postprint)

The flux pinning effects of Y2O3 nanoparticulate inclusions in YBa2Cu3O7 d (Y123 or YBCO) thin films using (Y2O3/Y123) · N multilayer structures were studied. The multilayer films were made with pulsed laser deposition (PLD) on SrTiO3 and LaAlO3 substrates with a Y2O3 nanoparticulate pseudo-layer thickness ranging from 0.2 to 1.4 nm, and YBCO layer thickness varying from 7 to 50 nm. Scanning el...

Synthesis of YBa2Cu3O(7-δ) and Y2BaCuO5 nanocrystalline powders for YBCO superconductors using carbon nanotube templates.

We fabricate nanosized superconducting YBa(2)Cu(3)O(7-δ) (Y-123) and nonsuperconducting Y(2)BaCuO(5) (Y-211) powders using carbon nanotubes as template. The mean particle size of Y-123 and Y-211 is 12 and 30 nm, respectively. The superconducting transition temperature of the Y-123 nanopowder is 90.9 K, similar to that of commercial, micrometer-scale powders fabricated by conventional processing...