Low temperature coefficient dielectric material comprising binary calcium niobate and calcium tantalate oxides

摘要

Dielectric materials comprising Ca2Ta2-xNbxO7 have high dielectric constants (Ks) and relatively low temperature coefficients of dielectric constants (TCKs). Preferably, in this composition 0.20 APPROXLESS x APPROXLESS 1.20 and more preferably 0.32 APPROXLESS x APPROXLESS 0.40, and particularly preferred is the composite where x is 0.36. With a preferred embodiment where x is about 0.36, the dielectric constant is near 30 and the TCK is about 2 ppm/ DEG C, and the Q of the polycrystalline ceramic at 1 MHz is approximately 5000. The dielectric materials are particularly useful in microwave communications applications.