首页|(162905)Spinel-type solid solution ceramic MgAl_2O_4-Mg_2TiO_4 with excellent microwave dielectric properties
(162905)Spinel-type solid solution ceramic MgAl_2O_4-Mg_2TiO_4 with excellent microwave dielectric properties
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NSTL
Elsevier
In this work, a series of (l-x)MgAl_2O_4-xMg_2TiO_4 (expressed as (l-x)MA- xMT) (0.0 < x < 0.9) ceramics were successfully prepared via a solid-state reaction, and the effect of Mg_2TiO_4 content on the phase compositions, microstructures and microwave dielectric properties of MgAl_2O_4 ceramics have been investigated. The MgAl_2O_4 could form a solid solution with Mg_2TiO_4, and the grain size of the (l-x)MA-xMT ceramics gradually increased with the increase of sintering temperature. The dielectric constants (ε_r) of (l-x)MA-xMT ceramics steadily increased with the increase of Mg_2TiO_4 content. The ε_r values were mainly affected by secondary phase and dielectric polarizability. The quality factor (Qf) of (l-x)MA-xMT ceramics was closely related to the relative density, secondary phase, cation vacancies and Ti valence; whereas the temperature coefficient of resonance frequency (τ_f) highly depended on the Al-site bond strength. For the sample at x = 0.9, the 0.1MA-0.9MT ceramics sintered at 1350 °C for 4 h exhibited the optimized microwave dielectric properties: ε_r = 12.36, Qf = 236,600 GHz and τ_f = -61 ppm/°C.
School of Mechanical & Electrical Engineering, Chengdu University of Technology, Chengdu 610059, China
State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China
NSTL
Elsevier
