Deposition and film characterisation
Effect of BaCaCu precursor matrix on the formation and properties of superconducting Tl2Ba2Can−1CunOx films A combined metalorganic chemical vapour deposition and thallium vapour diffusion approach

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Abstract

Superconducting thin films of the Tl2Ba2CaCu2Ox (2212) and Tl2Ba2Ca2Cu3Ox (2223) phases have been prepared through a combined approach of MOCVD and thallium vapour diffusion. The effects due to the nature of the BaCaCuO(F) precursor matrix on the formation of the TlBaCaCuO phase film have been investigated. Fluorinated [BaCaCuO(F)] matrices have been deposited from Ba(hfa)2·tetraglyme, Ca(hfa)2·tetraglyme and Cu(acac)2 via metalorganic chemical vapour deposition (MOCVD) on yttria-stabilized zirconia (YSZ) substrates. Both fluorinated [BaCaCuO(F)] and unfluorinated (BaCaCuO) matrices proved suitable for vapour diffusion thallium incorporation using selected Tl2O3:BaO:CaO:CuO mixtures. The formation of the superconducting 2212 and 2223 films is discussed depending upon the fluorinated and unfluorinated nature of the precursor matrices.

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