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Erschienen in:
22.05.2018
Adjustable microwave dielectric properties of ZnO–TiO2–ZrO2–Nb2O5 composite ceramics via controlling the raw ZrO2 content and sintering temperature
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 14/2018
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Abstract
A series of 2.5ZnO–(5−x)TiO2–xZrO2–2.5Nb2O5 (abbreviated as ZTZN, 0.2 ≤ x ≤ 0.4) composite ceramics were prepared by a solid state reaction method. The phase composition and microwave dielectric properties of the ceramics were investigated. X-ray diffraction patterns displayed the coexistence of ZnTiNb2O8 and Zn0.17Nb0.33Ti0.5O2 phases. With increasing the sintering temperature, the bulk density (ρ), permittivity (ε
r
) and temperature coefficient of resonator frequency (τ
f
) increased. With increasing the ZrO2 content, the ρ firstly increased and then decreased, Q × f value increased, ε
r
and τ
f
value decreased. Importantly, the τ
f
value of ZTZN ceramics (0.2 ≤ x ≤ 0.4) could be adjusted to near-zero. The 2.5ZnO–4.7TiO2–0.3ZrO2–2.5Nb2O5 ceramics sintered at 1075 °C exhibited the best comprehensive performances of Q × f = 30,155 GHz, ε
r
= 44 and τ
f
= 0.89 ppm/°C, indicating that they are candidates for microwave devices.