Synthesis, characterization, and microwave dielectric properties of ATiO(3) (A=Co, Mn, Ni) ceramics

Abstract

The ATiO(3) (A = Co, Mn, Ni) dielectric ceramics have been synthesized by the conventional solid-state ceramic route. The structure and microstructure of these ceramic samples have been studied using powder X-ray diffraction and scanning electron microscopy. The microwave dielectric properties such as relative permittivity (epsilon(r)), quality factor (Q(u) x f), and coefficient of temperature variation of resonant frequency (tau(f)) of the ceramics have been measured in the frequency range 4-6 GHz using resonance methods. The dielectric constant of ATiO(3) (A = Co, Mn, Ni) varies from 19 to 25 and tau(f) close to -50 ppm/degrees C. The ceramics have high-quality factors (Q(u) x f) of 62500 GHz (at 5.42 GHz) for CoTiO3, 15 200 GHz (at 5.22 GHz) for MnTiO3, and 13 900 GHz (at 5.24 GHz) for NiTiO3, respectively.