Investigation of Li 2 Zn 3 Ti 4 O 12 -based temperature stable dielectric ceramics for LTCC applications

A low temperature co-fired ceramic (LTCC) was fabricated at 910 °C /2 h from the powder mixture of Li 2 Zn 3 Ti 4 O 12 , TiO 2 and a B 2 O 3 –La 2 O 3 –MgO–TiO 2 glass (BLMT), and the influence of TiO 2 on microstructure and dielectric properties of the composite was investigated in the composition range (wt%) of 20BLMT–(80 − x)Li 2 Zn 3 Ti 4 O 12 –xTiO 2 (x = 0, 2.5, 5, 7.5, 9 and 10). The results showed that all samples consisted of Li 2 Zn 3 Ti 4 O 12 , TiO 2 , LaBO 3 and LaMgB 5 O 10 phase. And LaBO 3 , LaMgB 5 O 10 and a small amounts of TiO 2 were crystallized from BLMT glass during sintering process. As x increases, dielectric constant and temperature coefficient of resonance frequency of the composites demonstrated gradually increase, whereas the quality factor of the sample of x = 0 wt% was about 41,500 GHz and the ones maintained stable at a high level of 49,000–51,000 GHz for other samples. The composite with x = 9 wt% had an optimal microwave dielectric properties with the dielectric constant of 20.2, quality factor of 50,000 GHz and temperature coefficient of resonant frequency of − 0.33 ppm/°C.