We report on the spontaneous segregation of double perovskite Ba 2 YTaO 6 (BYTO) nanoparticles within YBa 2 Cu 3 O 7 (YBCO) films forming a nanocomposite with two ternary oxides by the low cost and scalable chemical solution trifluoroacetate approach. Phase orientation, nanostructural and pinning studies are carried out by 2D x-ray diffraction, advanced scanning transmission electron microscopy and transport measurements, respectively. In this complex oxide nanocomposite system (YBCO-BYTO) the majority of the nanoparticles segregated within the (00l)-oriented superconducting matrix are randomly oriented. The presence of randomly oriented nanoparticles plays a key role in the generation of localized highly strained areas within the YBCO matrix which are suggested to strongly affect the superconducting properties. The incorporation of 6-10% of BYTO resulted in a maximum pinning force, at 77 K, three times higher than that obtained for a pristine sample, while T c was maintained at 89-90 K.

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