Microwave dielectric properties of low loss microwave dielectric ceramics: A0.5Ti0.5NbO4 (A=Zn, Co)

• Published in: Journal of the European Ceramic Society Vol. 34; no. 15; pp. 3641 - 3648
• Main Author: Tseng, Ching-Fang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2014
• Subjects: A0.5Ti0.5NbO4 (A = Zn, Co) ceramics; Microstructure; Microwave dielectric properties; Microstructure; A0.5Ti0.5NbO4 (A=Zn, Co) ceramics; Microwave dielectric properties
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2014.06.010

The microwave dielectric properties of low-loss A0.5Ti0.5NbO4 (A=Zn, Co) ceramics prepared by the solid-state route had been investigated. The influence of various sintering conditions on microwave dielectric properties and the structure for A0.5Ti0.5NbO4 (A=Zn, Co) ceramics were discussed systematically. The Zn0.5Ti0.5NbO4 ceramic (hereafter referred to as ZTN) showed the excellent dielectric properties, with ɛr=37.4, Q×f=194,000 (GHz), and τf=−58ppm/°C and Co0.5Ti0.5NbO4 ceramic (hereafter referred to as CTN) had ɛr=64, Q×f=65,300 (GHz), and τf=223.2ppm/°C as sintered individually at 1100 and 1120°C for 6h. The dielectric constant was dependent on the ionic polarizability. The Q×f and τf are related to the packing fraction and oxygen bond valence of the compounds. Considering the extremely low dielectric loss, A0.5Ti0.5NbO4 (A=Zn and Co) ceramics could be good candidates for microwave or millimeter wave device application.