Microwave dielectric properties of ATiO(3) (A = Ni, Mg, Co, Mn) ceramics

Relationships between structural characteristics and microwave dielectric properties of ATiO(3) (A = Ni, Mg, Co, Mn) with ilmenite structure were investigated. The oxygen octahedral distortion was dependent on the type of A-site ions which affected to the temperature coefficient of the resonant frequency (TCF) of ATiO(3) ceramics. The quality factor (Qf) of ATiO(3) (A = Mn, Ni, Co) specimens was appreciably lowered than that of MgTiO(3) specimens due to the degree of covalency of cation-oxygen ion bond and the ordering of A-site ions. Also, the dielectric constant (K) was dependent on the electronic oxide polarizabilities of ATiO(3) ceramics.