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>Effects of Y2O3 doping on the dielectric properties and microstructures of SrTiO3-LaAlO3 microwave dielectric ceramics
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Effects of Y2O3 doping on the dielectric properties and microstructures of SrTiO3-LaAlO3 microwave dielectric ceramics
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 wtY2O3-doped 0.55SrTiO(3)-0.45LaAlO(3) ceramics, showing the potential application in fifth-generation communication.
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机译:本文采用常规固相反应法制备了SrTiO3-LaAlO3(ST-LA)微波介质陶瓷。Y2O3的加入对ST-LA陶瓷的相无显著影响,所有ST-LA样品均表现为单钙钛矿相,无次级相。Y2O3掺杂后获得了致密均匀的微观结构。能量色散X射线光谱分析表明,Y3+在晶粒中均匀分布。拉曼光谱揭示了BO6晶体结构的振动模式和畸变程度。Y2O3掺杂量的变化对ST-LA陶瓷在微波频率下的介电性能有显著影响。此外,在ε(r) = 44.01、Q x f = 59065 GHz(5.966 GHz时)和tau(f) = 6.09 ppm/度C的0.3 wt%Y2O3掺杂的0.55SrTiO(3)-0.45LaAlO(3)陶瓷中取得了优异的微波介电性能,显示出在第五代通信中的潜在应用。
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