Dielectric Properties of a New Ceramic System (1-x)(Mg_0.95Zn_0.05)₂TiO₄-x(Ca_0.8Sr_0.2)TiO₃ at Microwave Frequencies

Abstract:

The microwave dielectric properties and microstructures of the (1-x)(Mg_0.95Zn_0.05)₂TiO₄-x (Ca_0.8Sr_0.2)TiO₃ ceramics prepared using the conventional solid-state route were investigated. The structure and microstructure were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Ilmenite-structured (Mg_0.95Zn_0.05)TiO₃ was detected as a second phase. The coexistence of the second phase, however, did not degrade the dielectric properties of the specimen because the phases were compatible. At x = 0.07, a dielectric constant (ε_r) of ~17.86, a quality factor (Q×f) value of ~ Q×f~133,600 Hz (at 10 GHz), and a temperature coefficient of resonant frequency (τ_f) of ~ –5ppm/°Cwere obtained for 0.93(Mg_0.95Zn_0.05)₂TiO₄-0.07(Ca_0.8Sr_0.2)TiO₃ ceramic sintered at 1240°C for 4 hr. The dielectric is proposed as a candidate material for low-loss microwave and millimeter wave applications.

• Periodical: Key Engineering Materials (Volume 830)
• Pages: 37-42
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.830.37
• Online since: February 2020
• Authors: Shih Sheng Liu, Shiuan Ho Chang, Yuan Bin Chen*
• Keywords: Ceramics, Microwave Dielectric, SEM, XRD

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