Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1462712 | Ceramics International | 2012 | 6 Pages |
Abstract
Pseudobrookite-type Mg5Nb4O15 ceramics were prepared by aqueous sol-gel process and microwave dielectric properties were investigated. Highly reactive nanosized Mg5Nb4O15 powders were successfully synthesized at 600 °C in oxygen atmosphere with particle sizes of 20-40 nm firstly and then phase evolution was detected by DTA-TG and XRD. Sintering characteristics and microwave dielectric properties of Mg5Nb4O15 ceramics were studied at different temperatures ranging from 1200 °C to 1400 °C. With the increase of sintering temperature, density, Ér and Q·f values increased, and then saturated at 1300 °C. Excellent microwave properties of Ér â¼11.3, Q·f â¼43,300 GHz and Ïf â¼â58 ppm/°C, were obtained finally. The sintering temperature of Mg5Nb4O15 ceramics was significantly reduced by aqueous sol-gel process compared to conventional solid-state methods.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
H.T. Wu, W.B. Wu, Y.L. Yue, Y.M. Chen, F. Yang,