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Erschienen in:
22.05.2018
Structure and microwave dielectric properties of Zn0.9Mg0.1TiO3–Zn0.15Nb0.3Ti0.55O2 ceramics with ZnO–B2O3–SiO2 glass
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 14/2018
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Abstract
(1 − x)Zn0.9Mg0.1TiO3–xZn0.15Nb0.3Ti0.55O2 ((1 − x)ZMT–xZNT) (x = 0.100, 0.125, 0.150, 0.175, 0.200) ceramics were prepared at 900 °C by conventional mixed-oxide method. The phase content, microstructure and microwave dielectric properties had been investigated in detail. Rietveld refinement shows the coexistence of Zn0.9Mg0.1TiO3, Zn0.15Nb0.3Ti0.55O2, Zn(BO2)2 and Zn2TiO4 phases. With ZnO–B2O3–SiO2 (ZBS) glass added, the ceramics can be sintered well at 900 °C with a smaller grain size of 0.12 µm and a higher relative density (> 95%). The microwave dielectric properties are largely influenced by the phase composition according to mixture rule. A typical sample of 0.825ZMT–0.175ZNT ceramic with optimal dielectric properties (ε
r
= 26.14, Q × ƒ = 27184 GHz, τ
ƒ
= − 3.46 ppm °C−1) was sintered at 900 °C for 4 h.