Dielectric Properties of Two-Phase Mixture Ceramics Composed of Rutile and Its Compounds

Dielectric properties of two-phase mixture systems including rutile (TiO₂) have been investigated. One of its binary compounds-MnTiO₃, ZnTiO₃, PbTiO₃ and Al₂TiO₅-was chosen as the second component. Dielectric constants ε_r and their temperature coefficients τ_e were first examined at 1 MHz. Dielectric properties in the microwave frequency region were measured in the TE₀₁₁ mode of a cylindrical specimen. The temperature coefficient of resonant frequency, τ_f, of MnTiO₃ was negative, and a zero coefficient was found at an intermediate composition x=0.13 in the (1-x) MnTiO₃-xTiO₂ system. In the PbTiO₃-TiO₂ system, zero τ_e composition was confirmed at low frequencies, but composition modification trials aiming to make microwave dielectric measurements possible were unsuccessful throughout the entire system.