Effect of Sr²⁺doping on the microwave dielectric properties of BaZrO₃ ceramics

ABSTRACT

In this study, undoped and Sr²⁺ doped BaZrO₃ ceramics were prepared by solid-state reaction using 3 wt-% B₂O₃ as sintering aid. The phase composition and microstructure of BaZrO₃ were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that introducing an appropriate amount of Sr²⁺ makes BaZrO₃ ceramics Q × f value and density increase. In addition, the dielectric constant of BaZrO₃ ceramics increases with the increase of Sr²⁺ addition. With excellent microwave dielectric properties, ϵ_r= 34.17 and Q × f value of 39,070 GHz(@ 7.8 GHz) τ_f =  + 140 ppm/°C were obtained in 6 at.-% Sr²⁺ doped BaZrO₃ with 3 wt-% B₂O₃ sintering aid at 1275°C for 5 h. Using this material as the medium, the simulation of GPS antenna by HFSS software shows that this material has the potential to be used as the antenna medium material.

KEYWORDS:

• Microwave dielectric ceramics
• antenna
• barium zirconate

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Key Laboratory of Inorganic Functional Materials and Devices [grant number KLIFMD202301].