Microwave resonators in the system BaO•Nd2O3•TiO2

Resonators of the BaO·Nd₂O₃·Ti·2 solid-solution (BNT) phase have been synthesised by a mixed-oxide route. Various dopants, including Ca, Sr, and Pb, were used to tune electrical properties with varying degrees of success. Most samples show a multiphase character, with Nd₄Ti₉O₂₄ and NdTiO₃ being the main secondary phases. The space group of BNT may not conform to Pbnm (No. 62) symmetry, and the correct space group is possibly Pb2₁m (No. 26). The orientation relationship between NdTiO₃ and BNT has also been established.