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Temperature stable Ba3Ti5-x(Zn1/3Nb2/3)xNb6O28 (0 ≤ x ≤ 2) microwave dielectric ceramics for LTCC applications
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DOI：10.1016/j.jeurceramsoc.2026.118734.png)
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Abstract
En 中文
In this study, Ba3Ti5-x(Zn1/3Nb2/3)xNb6O28 (0 ≤ x ≤ 2) (BTZNx) ceramics were prepared via the conventional solid-state reaction method, with BaO-CuO-B2O3 (BCB) glass introduced as a sintering aid. The results demonstrate that pre-melting the sintering aid into a glass phase effectively suppresses the phase transformation from Ba3Ti5Nb6O28 to Ba3Ti4Nb4O21, which typically occurs when Ba2 +-containing oxide sintering aids are used. The BTZN0.5 ceramic with 1 wt% BCB glass achieves good densification when sintered at 950 °C and exhibits excellent microwave dielectric properties: εr = 36.1, Q×f = 30500 GHz@5.96 GHz, τf = −0.8 ppm/℃. In the millimeter-wave frequency range of 25–50 GHz, the relative permittivity remains stable at approximately 31, indicating good frequency stability at high frequencies. Co-firing compatibility tests confirm that no chemical reaction or physical penetration occurs between the modified ceramic and Cu electrodes, demonstrating its excellent potential for low-temperature co-fired ceramic (LTCC) applications.
Keywords:
Microwave dielectric ceramics
Ba3Ti5Nb6O28
Low-temperature co-fired ceramic technology
(Zn1/3Nb2/3)4+ substitution
Cu electrode compatibility
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6.2
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1.7W
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5.1W
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