LOW SINTERING TEMPERATURE, HIGH DIELECTRIC-CONSTANT AND SMALL TEMPERATURE-COEFFICIENT DIELECTRIC COMPOSITIONS

Crystal structures and dielectric properties of lead zinc titanium nio bate pyrochlores and bismuth zinc nickel niobate compositions were inv estigated as a function of composition and sintering temperature. Thes e dielectrics have dielectric constants between 70 and 165 and their t emperature coefficients are within +/-500 x 10(-6)degrees C-1. Some co mpositions have been identified to have a dielectric constant of 90 an d a temperature coefficient of 0 ppm degrees C-1. These compositions h ave a low sintering temperature (900-1000 degrees C) suitable for co-f iring with high Ag internal electrodes. Multilayer capacitors have bee n fabricated from some of these compositions, and their device propert ies match those measured in disk samples. Accelerated life tests were performed to show that these multilayer capacitors have a reasonably g ood reliability.