LEAD AND CADMIUM FREE, LOW TEMPERATURE FIRED X7R DIELECTRIC CERAMIC COMPOSITION AND METHOD OF MAKING

摘要

Multilayer ceramic chip capacitors (MLCCs) which satisfy X7R TCC requirements and which are compatible with silver-palladium internal electrodes. The MLCCs exhibit desirable dielectric properties - high capacitance, low dissipation factor, high insulation resistance, stable TCC - and excellent performance on highly accelerated life testing, and good resistance to dielectric breakdown. The dielectric layers comprise a lead-free and cadmium-free barium titanate base material doped with other metal oxides such oxides of zinc, boron, bismuth, barium, titanium, praseodymium, cerium, tungsten, neodymium, tungsten, tin, niobium, copper, and/or manganese in various combinations. The dielectric ceramic materials herein can be fired at less than 1150oC with an inner electrode having 70 wt% or more Ag and 30 wt% or less Pd to form an MLCC.