Abstract
An influence of various substrates (MgO, LaAlO 3, SrTiO 3, YSZ, CeO 2/r-sapphire) and Ba–Ca–Cu precursor chemical composition (212, 223) upon morphology and microwave quality of Tl 2Ba 2CaCu 2O 8 (Tl-2212) thin films has been studied. Under the same thalliation conditions, Tl-2212 phase has been synthesized in all films independently of the initial precursor film chemical composition (212, 223) with almost the same T c values. However, the film surface morphology and, thus, the microwave surface impedance, both were found to be strongly dependent from the type of substrate used as well as from the precursor chemical composition. Films with sharp transition to the superconducting state were prepared when 212 precursors were deposited on the MgO and/or LaAlO 3 substrates.
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