A nonconventional high k glass based on BaO·Nd 2O 3·-TiO 2·B 2O 3, which is combined with typical fillers of Al 2O 3 and BaTiO 3, has been investigated for the purpose of generating potential k (dielectric constant) ∼20 and k ∼ 40 dielectric materials as a result of densification at 850°C. Crystallization, densification, and dielectric properties depended strongly on the type and content of the fillers. Glass itself was crystallized mainly with BaTi(BO 3) 2. The Al 2O 3 filler did not seem to be directly involved in the crystallization process as only non Al-containing crystalline phases, such as NdBO 3, Nd 2Ti 4O 11, and BaNd 2Ti 5O 14, were observed. On the contrary, the BaTiO 3 filler resulted in the crystallization of two phases, BaTi(BO 3) 2 and BaNd 2Ti 5O 14. As an example of a promising dielectric candidate, a composite sample consisting of the glass and 30 wt% Al 2O 3 exhibited k ∼ 22 and tan δ ∼ 0.009 with nearly full densification at 850°C.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry