Solid-state synthesis of compositions from the Bi2O3-TeO2 system show that, under an oxygen atmosphere, Te4+ oxidizes to Te6+ and yields four room-temperature stable compounds: Bi2Te2O8, Bi2TeO6, Bi6Te2O15, and new a compound with the nominal composition 7Bi(2),O(3+)2TeO(2),. Dense ceramics can be prepared from all these compounds by sintering between 650degrees and 800degreesC under an oxygen atmosphere. The permittivity of these compounds varies from similar to30 to similar to54, the QXf value from 1.100 to 41.000 GHz (similar to5 GHz), and the temperature coefficient of resonant frequency from -43 to -144 ppm/K. Bi6Te2O15 and 7Bi(2)O(3)-2TeO(2) do not react with silver, and, therefore, they have the potential to be used for applications in low-temperature cofired ceramic (LTCC) technology.