Abstract
The sintering behavior, microstructure analysis, crystallization, and microwave performance of (Mg0.6Zn0.4)1−yNiyTiO3 (y = 0.01–0.2) ceramics, processed with raw powders of MgO, NiO, ZnO, and TiO2 via the conventional solid-state method, are investigated. The main phases of (Mg0.6Zn0.4)1−yNiyTiO3 ceramics were obtained. With partial replacement by Ni2+, the (Mg0.6Zn0.4)0.95Ni0.05TiO3 could be well sintered at 1200 °C, and the microwave performance was shown to be positively correlated with sintering temperature. The permittivity (εr) saturated at 18.7–19.3, and the quality factor (Qf) values approached 72,000–165,000 (GHz) as the sintering temperatures increase from 1125 to 1250 °C. The temperature coefficient of resonance frequency (τf) falls in a stable range of −62.9 to −66 ppm/°C as sintering temperature rising. A permittivity (εr) of 19.3, a maximum Qf value of 165,000 (GHz), and a temperature coefficient (τf) of −65.4 ppm/°C were measured for the samples at 1200 °C/4 h. (Mg0.6Zn0.4)0.95Ni0.05TiO3 material system shows high potential for applications of high frequency-selection components in satellite communication and 5G wireless telecommunication systems.
Highlights
Recent demands for high-frequency electronic components are increasing, and ceramicbased compositions are extensively used in satellite communications, including DBS TV, GPS, Internet of Things (IoT), etc., and 5G telecommunications, cell phone, cell site, etc.microwave dielectric ceramics are widely used for filters, resonators, and mixers in wireless communication systems [1,2,3,4]
MgTiO3 sintered at 1350 ◦ C was demonstrated excellent dielectric performance in microwave frequency: εr ~17, quality factor (Qf) value ~160,000 and temperature coefficients of resonance frequency ~ −51 ppm/◦ C [10]
The (Mg0.6 Zn0.4 )0.95 Ni0.05 TiO3 with an ilmenitetype structure, the same as (Mg0.6 Zn0.4 )TiO3 : trigonal (ICDD #01-073-7752), were identified as the main phase associated with the apparent second phase (Mg0.6 Zn0.4 )0.95 Ni0.05 Ti2 O5 identical to MgTi2 O5 (JCPDS File No 82-1125)
Summary
Recent demands for high-frequency electronic components are increasing, and ceramicbased compositions are extensively used in satellite communications, including DBS TV, GPS, Internet of Things (IoT), etc., and 5G telecommunications, cell phone, cell site, etc. (3) Temperature coefficient of resonance frequency (τf ) < ±10 ppm/◦ C: A near-zero τf value (
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