Preparation of LTCC materials with adjustable permittivity based on BaO–B2O3–SiO2/BaTiO3 system

•The ϵ of BaO–B2O3–SiO2 glass can be adjusted from 5 to 30 by adding BaTiO3.•The influence factors on dielectric are the secondary phase and microstructure.•BaO–B2O3–SiO2/BaTiO3 system can fabricate LTCC when BaTiO3 located in 60–80 wt%.

This paper studied the preparation and characterization of LTCC (low temperature co-fired ceramics) materials based on BaO–B2O3–SiO2/BaTiO3 glass–ceramics, where the sintering temperature was about 900 °C and dielectric constant was effectively adjustable from 5 to 30 by changing the BaTiO3 fraction from 60 wt% to 90 wt%. X-ray diffractometer (XRD), scanning electron microscopy (SEM) were used to examine the effect of different amounts additive on the dielectric properties of this LTCC system and the crystal structure change. The results indicated that BaTiO3 can be used as a dielectric additive aim to adjust the permittivity of BaO–B2O3–SiO2 glass, which the main influence factors on dielectric are the contents of the secondary phase, the BaTiO3 phase fraction and the porous structure of the sintered body. Therefore, the microstructure and dielectric property of BaO–B2O3–SiO2/BaTiO3 glass–ceramics composites could be controlled by adjusting the content of BaTiO3 additive.

Graphical abstractThe dielectric constant (ϵ) of the sintered BaO–B2O3–SiO2/BaTiO3 glass/ceramics (the sintered samples with line shrinkage of 10%) changed from 5 to 30 and the dielectric losses (tanδ) was lower than 0.05 at 100 MHz with the amount of BaTiO3 additive increment from 60 wt% to 90 wt% fraction.Figure optionsDownload full-size imageDownload as PowerPoint slide