Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5438843 | Ceramics International | 2017 | 4 Pages |
Abstract
Nonstoichiometry has been playing an important role in the microwave dielectric performance of columbites A2+Nb2O6 (A2+ = Ca, Mg, or a transition metal). Herein, with an excess of 0.01 mol Zn, the QÃf values of ZnNb2O6 ceramics could be effectively improved from 121,000 GHz to 138,000 GHz. On the basis of high-Q Zn1.01Nb2O6 ceramics, TiO2 was chosen to further tune the Ïf values for the matrix materials prepared by the conventional solid-state reaction method. The results showed that, with the increase of TiO2 content, the ZnNb2O6-based ceramics underwent four phase regions: columbite (ZnNb2O6) solid solution, ixiolite (ZnTiNb2O8) solid solution, mixture of ZnTiNb2O8 and rutile (Zn1/3Nb2/3)0.5Ti0.5O2, and (Zn1/3Nb2/3)0.5Ti0.5O2 solid solution. Such changes in phase formation had an important influence on the microwave dielectric behavior of (1âx)Zn1.01Nb2O6-xTiO2 ceramics. Importantly, Ïf could be tuned from â15.3 ppm/°C to +13.9 ppm/°C along with x increased from 0.58 to 0.6. Accompanied with εr â 44.64 ~ 47.43 and QÃf ⥠12,300 GHz, these materials are promising candidates for applications in microwave components and devices.
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Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Jie Zhang, Zhenxing Yue, Longtu Li,