MgTiO3 doping effect on dielectric properties of Ba0.6Sr0.4TiO3 ceramics via a molten salt process

Ba0.6Sr0.4TiO3–MgTiO3 composites were prepared by reaction of BST powders with molten MgCl2 at various MgCl2/BST molar ratios at 600 and 800 °C in air. The products were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It is shown that the ceramic composites have a relaxor-like ferroelectric transition as MgTiO3 is above 8 mol%. The addition of MgTiO3 has greatly reduced the dielectric loss of BST ceramics. The BST–MT ceramics could be a promising candidate for tunable microwave device applications.