CHARACTERIZATION OF POTASSIUM TANTALUM NIOBATE FILMS FORMED BY METALORGANIC DEPOSITION

Thin films of potassium tantalum niobate, KTa0.6Nb0.4O3, with a Curie temperature of 20-degrees-C were deposited on a variety of substrates by metalorganic deposition. These films had peak relative permittivities of 16 000 at 20-degrees-C. Hysteresis plots of electric displacement as a function of electric field, taken at 0-degrees-C, revealed a coercive field of 800 V/cm, a spontaneous polarization of 3.9-mu-C/cm2, and a remnant polarization of 0.5-mu-C/cm2. The hysteresis loops did not change significantly as the temperature was varied down to -100-degrees-C.