Microwave Dielectric Properties of Ca(Li_1/3Nb_2/3)O_3-δ Ceramics with ZnO Additive

Abstract:

The complex perovskite compound Ca(Li_1/3Nb_2/3)O_3-δ(CLN) ceramics have received much attention due to the superior properties and relatively low sintering temperature 1150°C. In order to further low the sintering temperature of the CLN ceramics, enhance the Q · f values and other dielectric properties, the effects of the additive ZnO on the sinterability and dielectric properties of the CLN have been investigated. The CLN ceramics were prepared by conventional solid state ceramic route. With the addition of 1.0 wt% ZnO, the sintering temperature of Ca(Li_1/3Nb_2/3)O_3-δ(CLN) ceramics was effectively reduced from 1150 ^◦C to 1090 ^◦C，and the Q · f value was increased from 18920 to 20950 GHz (at 7.09 GHz). It also possesses compatible dielectric constant ε_r of 27.8 and τ_f value of -23.57 ppm/^◦C. While with the addition of 1.25 wt% ZnO, the Q · f value of Ca(Li_1/3 Nb_2/3)O_3-δ (CLN) ceramics sintered at 1150 ^◦C for 3 hours was increased significantly to 32150 GHz (at 7.09 GHz), ε_r of 28.3 and τ_f value of -18.55 ppm/^◦C. The relationship between microstructure and microwave dielectric characteristics was studied using X-ray diffractometer and Scanning electron microscope.

• Periodical: Materials Science Forum (Volume 687)
• Pages: 144-150
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.687.144
• Online since: June 2011
• Authors: Ji Hong Liao, Ying Dai, Wen Chen, Lian Xiang Tan, Shao Hua Qu
• Keywords: Additive, Ca(Li_1/3Nb_2/3)O_3-δ, Microwave Dielectric Ceramic, Sinterability, Zinc Oxide (ZnO)

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