Microwave ceramics based on BaO-TiO₂-La₂O₃ system

Abstract

Abstract Dielectric properties of Al-stabilized La_2/3TiO₃ perovskite ceramics were measured at MHz and GHz frequencies. In contrast with the already reported dielectric properties of La_2/3TiO₃ monocrystals or undoped La_2/3TiO₃ ceramics prepared at high temperatures, Al-stabilized La_2/3TiO₃ ceramics is distinguished by a decreased dielectric loss (tgδ< 3.10⁻⁴) In a microwave frequency range, the dielectric constant remains high (60–72), and the Q-factor is between 9.600–20.000. Further improvement of electrical properties was achieved by Bi₂O₃.2TiO₂ addition (Tk). The addition of BaLa₂Ti₄O₁₂ slightly increased the dielectric constant measured in microwave frequency range, but the Q-factor decreased significantly.