A new potential low-temperature co-fired ceramics (LTCC) system based on a simple lanthanum borate (La2O3-B2O3) glass was investigated with regard to phase development and microwave dielectric properties as functions of alumina filler content less than 50 wt% and firing temperature up to 1050°C. Unexpected crystalline phases, such as La(BO2)3, LaAl2.03 (B4O 10)O0.54, LaBO3, and Al20B 4O36, developed during the firing process are likely responsible for substantial resultant changes in physical and microwave dielectric properties. As a specific example, a high-quality factor of 785 at 15.8 GHz obtained for a composition containing 30 wt% alumina supports the hypothesis that the phase-dielectric property relation exists in this LTCC system. On a practical basis, two phases of LaAl2.03 (B 4O10)O0.54 and LaBO3 must be important in determining the final dielectric performance by manipulating the ratios of glass and filler and by selecting a desirable temperature.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry