Abstract
The prepared (Mg1-xCox)2(Ti0.95Sn0.05)O4 (x=0.01~0.009) ceramics are sintered at 1275-1425oC, the needed sintering temperatures of (Mg1-xCox)2(Ti0.95Sn0.05)O4 ceramics slightly increased with the increase of Co4+ content. The sintering characteristics of (Mg1-xCox)2(Ti0.95Sn0.05)O4 ceramics are developed by the X-ray diffraction patterns and SEM observations to find the influence of sintering temperatures and Sn4+ content on the crystal structure and the grain growth. The influence Co4+ content and sintering temperatures on the quality values (Q×f) and the temperature coefficient of resonant frequency (τf values) of (Mg1-xCox)2(Ti0.95Sn0.05)O4 ceramics at microwave frequency are well developed in this study. As an optimal compose, (Mg1-xCox)2(Ti0.95Sn0.05)O4 (x=0.05) successfully demonstrated a dielectric constant of 14.70, a Q×f of 330,000 GHz and a temperature coefficient of resonent frequency value of -48.18 ppm/oC sintering at 1350oC.
Highlights
The rapid growth of recent wireless communication systems led to an increasing demand for small-scale high-frequency resonators, filters and antennas capable of operating in the GHz range [1,2]
In order to work with high efficiency and stability, many researches have been focusing on developing new dielectric materials with a high quality factor (Q×f) and a near-zero temperature coefficient of resonant frequency for use as dielectric resonator and microwave device substrate [7,8,9]
The results indicated that with the partial replacement of Mg2+ by Co2+, Mg2TiO4–Co2TiO4 ceramics would form solid solutions
Summary
The rapid growth of recent wireless communication systems led to an increasing demand for small-scale high-frequency resonators, filters and antennas capable of operating in the GHz range [1,2]. The unique electrical properties of ceramic dielectric resonators have revolutionized the microwave-based wireless communications industry by reducing the size and cost of filter and oscillator components in circuit systems [3,4,5,6]. Mg2TiO4-based ceramics have wide applications as dielectrics in resonators, filters and antennas for communication, radar and global positioning systems operating at microwave frequencies. Since the ionic radius of Mg 2+ ions (0.78 Å) is similar to that of Co2+ ions (0.82 Å), the Mg2+ ion can be replaced by the Co2+ ion to form (Mg1-xCox)2(Ti0.95Sn0.05)O4 In this investigation, (Mg1-xCox)2(Ti0.95Sn0.05) O4 were synthesized and some of the Sn4+ ions were substituted with Ti4+ ions to improve their microwave dielectric properties. They have been defined previously in terms of electrical circuit concepts and electromagnetic field concepts
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