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Erschienen in:
01.01.2013
Phase structure and microwave dielectric properties of Mn-doped (1−x)ZrTi2O6–xZnNb2O6(x = 0.13–0.53) ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 1/2013
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Abstract
(1−x)ZrTi2O6–xZnNb2O6(x = 0.13–0.53) ceramics doped with 0.7 wt% MnCO3 were prepared by solid-state reaction and they were all sintered well in air at 1,270 °C. XRD analysis suggested there were a two-phase region for ZrTi2O6–TiO2(x = 0.20–0.33) and a single-phase region for ZrTi2O6(x = 0.40–0.53) because (Zn1/3Nb2/3)4+ preferentially substituted Ti4+ sites, and thereafter Zr4+ sites. The addition of Mn, working as acceptors to receive the electrons left by the lost oxygen, raised the Q × f value dramatically. For 0.7 wt% MnCO3 doped (1−x)ZrTi2O6–xZnNb2O6 ceramics, with the increase of x, the εr and the τf dropped from 53.4 to 41.0 and from +95 ppm/°C to −35 ppm/°C respectively, and the Q × f value increased from 26,300 GHz to 48,100 GHz. At last, 0.69ZrTi2O6–0.31ZnNb2O6+0.7 wt % MnCO3 ceramics showed excellent dielectric properties: εr = 45.3, Q × f = 43,300 GHz and τf = −0.5 ppm/°C. Another advantage is that the sintering atmosphere was in air, which is benefit to the commercial application.