Influence of processing conditions of T1-2212 superconducting films deposited from an aerosol upon their T_c and oxygen Raman modes

T1 based 2212 films were prepared on MgO and YSZ substrates in two steps. First, Ba-Ca-Cu-O precursors were deposited from an aerosol, followed by two types of thallination and oxygenation in a single-zone reaction chamber. Critical temperatures T_c, X-ray and oxygen related Raman modes were measured on superconducting films. The T_c. values of prepared films varied from the interval of 95.0 to 103.5 K. We did not find any pronounced relation between the T_c values and a and c unit cell parameters. The Raman spectra of investigated films revealed peaks assigned to O(1), O(2) and O(3) atom vibrations, one peak determining the degree of recrystallization from an initial amorphous phase, and peaks originating from impurity phases. Apparently, prolonged thermal processing of films creates both, metal-cation and oxygen-anion disorder as well. It seems that a well defined relation between the transition temperature T_c and the Raman shift in the O(2) vibrations exists. It is proposed, that this relation serves as an indirect indication of a lack of oxygen in the film samples.