New Compositions for Hybrid Circuits Available to Purchase

New resistor compositions prepared by using special kinds of glass, CdO, RuO2 and Nb2O5, have been developed. This system is typical in containing only a small amount of RuO2, ranging from 2 wt% to 8 wt%. The properties of resistors prepared from various compositions were tested in relation to peak firing temperature varying in the range from 720°C up to 800°C. In this way conditions were found for resistor preparation with low TCR and high long‐term stability at 95% relative humidity and at 40°C. By adding very small amounts (0·4–0·9%) of Nb2O5 the TCR was very drastically reduced and could achieve almost zero value. The resistance changes after 4,000 hours ranged from 0·1% to 0·8%. Further new types of dielectric compositions were prepared. The bulk insulation resistance of fired layers reached values in the range of 1012ohms/cm2; the dielectric constant (≈7) and dissipation factor (≈10−3) were also measured. This composition is well suited to applications in both oxidation and inert atmosphere.