Phase Composition, Crystal Structure and Microwave Dielectric Properties of Nb-Doped Yttrium Aluminum Garnet Ceramics

Abstract:

The Y₃Al_5-xNb_xO₁₂ (0 ≤ x ≤ 0.06) garnet ceramics were prepared by solid-state reaction method. The effects of Nb⁵⁺ substitution on the phase composition, microstructure and microwave dielectric properties were investigated. All samples retained the yttrium-aluminum garnet solid solution form until x up to 0.06 at which YNbO₄ secondary phase precipitated. The doping of Nb₂O₅ improved the grain development and enhanced the physical properties of the ceramics under the sintering condition of 8 h at 1700 °C. Specifically, with the substitution of Nb⁵⁺, the degree of micromorphology improvement and quality factor first increased and then decreased, with a maximum value at x = 0.015. Finally, the best combination of microwave dielectric properties was obtained, i.e., ε_r = 10.79, Q×f = 165,478 GHz, τ_f = -31.7 ppm/°C. This study provides a theoretical basis for the further expansion and application of yttrium aluminum garnet in the microwave field. Keywords: Yttrium Aluminum Garnet ceramics, Nb₂O₅, microwave dielectric properties.

• Periodical: Materials Science Forum (Volume 1080)
• Pages: 123-129
• DOI: https://doi.org/10.4028/p-qelb86
• Online since: January 2023
• Authors: Mo Ke Zhou*, Shu Ren Zhang, Bin Tang
• Keywords: Microwave Dielectric Properties, Nb₂O₅, Yttrium Aluminum Garnet Ceramics

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