Tunable Microwave Dielectric Properties of Ca0.6La0.8/3TiO3 and Ca0.8Sm0.4/3TiO3-Modified (Mg0.6Zn0.4)0.95Ni0.05TiO3 Ceramics with a Near-Zero Temperature Coefficient

Chung-Long Pan; Chun-Hsu Shen; Shih-Hung Lin; Qi-Zi Lin

doi:10.3390/molecules26164715

Tunable Microwave Dielectric Properties of Ca_0.6La_0.8/3TiO₃ and Ca_0.8Sm_0.4/3TiO₃-Modified (Mg_0.6Zn_0.4)_0.95Ni_0.05TiO₃ Ceramics with a Near-Zero Temperature Coefficient

Molecules. 2021 Aug 4;26(16):4715. doi: 10.3390/molecules26164715.

Authors

Chung-Long Pan¹, Chun-Hsu Shen², Shih-Hung Lin², Qi-Zi Lin²

Affiliations

¹ Department of Electrical Engineering, I-Shou University, No. 1, Sec. 1, Syuecheng Rd., Dashu District, Kaohsiung City 84001, Taiwan.
² Department of Electronic Engineering, National Yunlin University of Science and Technology, Section 3, 123 University Road, Douliou, Yunlin 64002, Taiwan.

Abstract

The microstructures and microwave dielectric properties of (Mg_0.6Zn_0.4)_0.95Ni_0.05TiO₃ with Ca_0.6La_0.8/3TiO₃ and Ca_0.8Sm_0.4/3TiO₃ additions prepared by the solid-state method has been investigated. The crystallization and microstructures of these two mixed dielectrics were checked by XRD, EDX, BEI, and SEM to demonstrate two phase systems. Furthermore, the tunable dielectric properties can be achieved by adjusting the amounts of Ca_0.6La_0.8/3TiO₃ and Ca_0.8Sm_0.4/3TiO₃ additions, respectively. After optimization of processed parameters, a new dielectric material system 0.88(Mg_0.6Zn_0.4)_0.95Ni_0.05TiO₃-0.12Ca_0.6La_0.8/3TiO₃ possesses a permittivity (ε_r) of 24.7, a Qf value of 106,000 (GHz), and a τ_f value of 3.8 (ppm/°C), with sintering temperature at 1225 °C for 4 h. This dielectric system with a near-zero temperature coefficient and appropriate microwave properties revealed a high potential for high-quality substrates adopted in wireless communication devices.

Keywords: dielectric properties; near-zero temperature coefficient; temperature coefficient; wireless communication.

Abstract

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