Dielectric behaviour of sodium and potassium doped magnesium titanate

Pure phase of magnesium titanate (MgTiO $_{\boldsymbol{3}})$ was obtained at 1100°C by both the conventional solid-state method as well as by the flux method starting from hexahydrated magnesium nitrate and titanium dioxide as the reactants. MgTiO $_{\boldsymbol{3}}$ doped with Na or K was also prepared by the solid-state route. Na and K doped compositions led to monophasic MgTiO $_{\boldsymbol{3}}$ below 5 mol % dopant concentration while biphasic mixture of MgTiO $_{\boldsymbol{3}}$ (major phase) and MgTi $_{\boldsymbol{2}}$ O $_{\boldsymbol{5}}$ (minor phase) were obtained at higher dopant concentration. The dielectric constant and dielectric loss of MgTiO $_{\boldsymbol{3}}$ were found to be almost the same irrespective of the preparative method. MgTiO $_{\boldsymbol{3}}$ doped with 5 mol % of Na and K ions displayed optimum dielectric properties.