CaCu 3Ti 4O 12 (CCTO) has been studied as a filler for the potential high k LTCC (low temperature co-fired ceramics) materials based on a nonconventional BaO·Nd 2O 3·TiO 2·B 2O 3 glass in terms of firing temperature and CCTO content. The material system was proven to be high crystallizable as the resultant crystalline phases of BaTi(BO 3) 2, BaNd 2Ti 5O 14 and NdBO 3 were observed. The relative content of the crystalline phases were strongly dependant on firing temperature and CCTO content. Interestingly, the 30 wt% CCTO sample showed early densification at 610-670 °C and then unexpected expansion after 850 °C. The 40-60 wt% CCTO samples showed the unexpected secondary densification behavior over the temperature range of 850-950 °C. As a promising example, a combination consisting of the glass and 40 wt% CCTO exhibited k ∼55 and tan δ ∼0.07, which is very rare at this low sintering temperature of 850 °C. These materials system were found to be chemically very stable especially in the H 2SO 4 acid solution.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2011-0017983 ).
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry