Abstract
Well-densified Li3(Mg1−xZnx)2SbO6 (0.00 ≤ x ≤ 0.08) microwave dielectric ceramics were synthesized via a two-stage sintering process. The effects of Zn2+ substitution on the microstructure and microwave dielectric properties were investigated. All samples were identified as pure phase via the XRD detection. Remarkable microwave dielectric properties with a near-zero τf value were obtained in the Li3(Mg1−xZnx)2SbO6 (x = 0.04) sample sintered at 1325 °C for 5 h: εr = 7.8, Q × f = 97,719 GHz (13.4 GHz), τf = − 6 ppm/°C. The high Q × f value was related with the FWHM and grain size effect. All experimental results indicate that the Li3(Mg1−xZnx)2SbO6 ceramics are promising for 5G communication applications.
Highlights
With the rapid development of wireless communication, high performanced microwave dielectric ceramics are widely applied to various components, such as antennas, resonators, and substrates, etc [1]
Few works focused on the Li3Mg2SbO6 systems due to its easy cracking characteristics during the sintering process, which were attributed to the reaction with individual oxide components
As no secondary phases are detected via the XRD, the permittivity of the Li3(Mg1 − xZnx)2SbO6 ceramics is mainly determined by the compactness
Summary
With the rapid development of wireless communication, high performanced microwave dielectric ceramics are widely applied to various components, such as antennas, resonators, and substrates, etc [1]. Microwave dielectric ceramics with low dielectric permittivity (εr), low loss (high Q × f value), and good thermal stability (near-zero τf value) are expected to play an important role in 5G communication devices due to their potentials in reducing the signal delay, enhancing the frequency selectivity, and broadening the working temperature range. Li3Mg2NbO6-based ceramics with orthorhombic structure have attracted much attention due to its excellent microwave dielectric properties [4]. It is reported that partial Mg2+ ion-substitution could improve the microwave dielectric properties of Li3Mg2NbO6-based ceramics [5,6,7,8,9,10,11,12]. Excellent microwave dielectric properties were obtained at the sintering temperature of 1300 °C: εr = 10.5, Q × f = 84,600 GHz and τf =-9 ppm/°C [15]. More efforts are still requested to push the τf value towards zero
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