Abstract:
Ceramic electrode materials (14, 16) of the invention include ceramic compositions having significant electrical conductivity at room temperature. The ceramic electrodes (14, 16) are coupled to a dielectric (12) to provide electrical devices such as capacitors(10) and transducers (10). The presently known ceramic compositions having room temperature conductivity are ceramic materials that are superconductors at low temperatures and include compositions of the formula: ZBa2-xAxO9-y, where Z is Y, La or any of the lanthanide series elements; A is Na, K, Rb, Cs or Pb; x is in the range 0.0 to 0.2; and y is about 2.0. Compositions having the formula: Bi2Sr3-xCaxCu2Oy, where x is in the range 0.0 to 2.0 and y is in the range 5.0 to 8.0 may also be used as ceramic electrodes (14, 16). The ceramic electrodes (14, 16) have similar perovskite crystalline structures to the dielectrics (12) forming the electrical devices (10) of the invention.
Abstract:
Bonding additives for refractory metallization compositions allow for circuit traces having good resistivities and adhesion values in excess of 6 kpsi, generally between about 10 and 20 kpsi. The inks are provided in formulations devoid of a glass component, and are suitable for co-sintering circuit traces and vias with 96+ % alumina substrates, and especially for 99+ % alumina substrates. Suitable bonding additives are the oxides of molybdenum, tungsten, niobium, manganese, yttrium, and titanium, or mixtures of such oxides.