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Published in:
01-05-2013
Phase structure and microwave dielectric properties of Zr(Zn1/3Nb2/3)xTi2−xO6 (0.2 ≤ x ≤ 0.8) ceramics
Published in: Journal of Materials Science: Materials in Electronics | Issue 5/2013
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Abstract
The phase structure, morphology and microwave dielectric properties of Zr(Zn1/3Nb2/3)xTi2−xO6 (0.2 ≤ x ≤ 0.8) ceramics were investigated as a function of the amount of (Zn1/3Nb2/3)4+ substitution by the solid-state reaction technique. X-ray diffraction analysis showed the co-existence of the solid solution ZrTiO4 (x = 0.2) or ZrTi2O6(x = 0.4–0.5) as the main phase and TiO2 as the second phase, and the single-phase region for substituted ZrTi2O6 was obtained with x ≥ 0.5. As increasing x from 0.2 to 0.8, the grain growth was promoted, moreover the dielectric constant εr and the temperature coefficient of resonant frequency τf dropped from 53.8 to 39.2 and from +106.2 to −25.5 ppm/°C respectively, and the Q × f values increased from 33,200 to 43,200 GHz. Ceramics with good microwave dielectric properties: εr = 41.7, Q × f = 42,100 GHz and τf = −15.5 ppm/°C was obtained at x = 0.6.