Low-temperature Sintering and Dielectric Properties of $CaZrO_3-CaTiO_3$ Ceramics for Middle- Permittivity LTCC Substrate

The microwave dielectric properties of ceramics with addition of were studied. The effect of glass addition on the low-temperature sintering and microwave dielectric properties of ceramics were also evaluated to develop the materials for functional substrates of low-temperature co-fired ceramics. When of lithium borosilicate glass was added, the sintering temperature of the ceramics decreased from to below . As the of glass frits and are slightly negative and that of is significantly positive, zero could be realized by mixing an appropriate amount of with . The ceramics sintered at with glass frits showed the relative density of , permittivity of 23, quality factor of 2500 GHz, and temperature coefficient of resonant frequency of .