Ceramics (Mar 2024)

Zero-Temperature Coefficient of Resonant Frequency in [(Mg<sub>0.6</sub>Zn<sub>0.4</sub>)<sub>0.95</sub>Co<sub>0.05</sub>]<sub>1.02</sub>TiO<sub>3.02</sub>-Ca<sub>0.6</sub>(La<sub>0.9</sub>Y<sub>0.1</sub>)<sub>0.2667</sub>TiO<sub>3</sub> Ultra-Low-Loss Composite Dielectrics

  • Yuan-Bin Chen,
  • Jie Peng

DOI
https://doi.org/10.3390/ceramics7020030
Journal volume & issue
Vol. 7, no. 2
pp. 466 – 477

Abstract

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Investigating the microwave dielectric properties of ceramics prepared through the conventional solid-state route, such as x[(Mg0.6Zn0.4)0.95Co0.05]1.02TiO3.02-(1−x)Ca0.6(La0.9Y0.1)0.2667TiO3, reveals notable characteristics. [(Mg0.6Zn0.4)0.95Co0.05]1.02TiO3.02 shows a permittivity (εr) of approximately 20, a high quality factor (Q × f) ranging between 250,000 and 560,000 GHz, and a temperature coefficient of resonant frequency (τf) of approximately −65 ppm/°C. To enhance the temperature stability, Ca0.6(La0.9Y0.1)0.2667TiO3 featuring a τf value of +374 ppm/°C was incorporated into the [(Mg0.6Zn0.4)0.95Co0.05]1.02TiO3.02 composition. τf demonstrated an increase with rising Ca0.6(La0.9Y0.1)0.2667TiO3 content, reaching zero at x = 0.95. A ceramic composition of 0.95[(Mg0.6Zn0.4)0.95Co0.05]1.02TiO3.02-0.05Ca0.6(La0.9Y0.1)0.2667TiO3, incorporating 3wt.% BaCu(B2O5) as sintering aids, exhibited outstanding microwave dielectric properties: εr~22.5, Q × f~195,000 (at 9 GHz), and τf~0.1ppm/°C, with a sintering temperature at 950 °C. This material is proposed as a prospective candidate for 6G band components and GPS antennas.

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