*2.3.3 Deviated compositions with high Qf from stoichiometric complex perovskite composition*

In a BaO-Mg/ZnO-Ta2O5 partial ternary ceramic (BMT/BZT system), complex perovskite such as BMT and BZT are forming solid solutions, and the *Qf* values varied intrinsically based on the crystal structure in the solid solutions depending on the density and defects. In this section, the crystal structure and properties on the varied compositions from the stoichiometric complex perovskite composition are reviewed for high *Qf* research.
