![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
Microwave dielectric composite ceramics with compositions of (1-x)Ba(Zn 1/3 Nb 2/3 )O 3 -BaWO 4 (x = 0.1∼ 0.4) were prepared. The increasing BaWO 4 content can effectively lower the sintering temperature of the composite ceramics from 1400°C to 1250°C. XRD indicated that Ba(Zn 1/3 Nb 2/3 )O 3 and BaWO 4 coexisted. SEM observation revealed that the grain size increased with the sintering temperature rising up. The microwave dielectric properties of the sintered ceramics varied with the BaWO 4 content. The samples with x = 0.4 sintered at 1225°C exhibited the best microwave dielectric property: a near zero temperature coefficient of resonant frequency of τ f = −2.1 ppm/°C, ϵ r = 24.0, Q×f = 65300 GHz was obtained.
Acknowledgment
This work was supported by the Natural Science Foundation of China (Grant Nos. 50672043, 50621201 and 50632030), and the Ministry of Science and Technology of China through 973-Project under 2009CB623306.