BaO·Nd2O3·5TiO2 (BNT) ceramics modified with a borate glass containing Ba, Nd and Ti as glass constituents were investigated with regard to their sintering behavior and microwave dielectric properties. An addition of iso-component glass significantly improved the sinterabilty of the BNT ceramics and lowered the sintering temperature. A maximum density of 5.29 g/cm3 and an x-y shrinkage of 17% were obtained for BNT ceramics containing 10wt.% of the glass sintered at 1100°C. The dielectric composition without the glass additive was only slightly densified at 1100°C. The resulting sample exhibited two crystalline phases, BaNd2 Ti5O14 and Ba2 Ti9O20, regardless of sintering temperature and glass content. When >10wt.% glass was added, exaggerated grain growth with a less uniform microstructure was found, resulting in the subsequent reduction of the fired density and the dielectric properties. BNT ceramics containing 10wt.% of the isocomponent glass sintered at 1100°C for 4 h showed promising dielectric properties of k=71.3 and Q=1,330.
All Science Journal Classification (ASJC) codes
- Materials Science(all)