Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 10, Pages 14288-14294Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.01.317
Keywords
Microwave dielectric ceramics; 0.55SrTiO(3)-0.45LaAlO(3); Dielectric properties; Y2O3 additive
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Funding
- Foshan Xianhu Laboratory of Advanced Energy Science and Technology Guangdong Laboratory [XHT2020-011]
- Self-determined and Innovative Research Funds of SKLWUT [2021-PY-4]
- Sanya Science and Education Innovation Park of Wuhan University of Technology [2020KF0017]
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Y2O3-doped ST-LA microwave dielectric ceramics were prepared using a conventional solid-state reaction. The addition of Y2O3 did not significantly affect the phases, resulting in dense and uniform microstructures. The doping amount of Y2O3 had a substantial impact on the dielectric properties. The 0.3 wt%Y2O3-doped ceramics exhibited excellent microwave dielectric properties, indicating potential applications in fifth-generation communication.
Herein, SrTiO3-LaAlO3 (ST-LA) microwave dielectric ceramics were prepared by a conventional solid-state reaction. The addition of Y2O3 had no significant influences on the phases of ST-LA ceramics, and all the ST-LA samples exhibited single perovskite phase with no secondary phase. The dense and uniform microstructures were obtained after Y2O3-doping. Energy-dispersive X-ray spectroscopy showed that Y3+ was homogeneously distributed in the grains. Raman spectra revealed the vibration modes of the crystal structures and the distortion degrees of BO6. The change in the doping amount of Y2O3 substantially affected the dielectric properties of ST-LA ceramics at microwave frequencies. Moreover, excellent microwave dielectric properties with epsilon(r) = 44.01, Q x f = 59065 GHz (at 5.966 GHz) and tau(f) = 6.09 ppm/degrees C were achieved for 0.3 wt%Y2O3-doped 0.55SrTiO(3)-0.45LaAlO(3) ceramics, showing the potential application in fifth-generation communication.
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