Microwave dielectric properties of CaWO4–Li2TiO3 ceramics added with LBSCA glass for LTCC applications. Issue 14 (1st November 2016)

• Record Type: Journal Article
• Authors: Zhang, Shuo; Su, Hua; Zhang, Huaiwu; Jing, Yulan; Tang, Xiaoli
• Is Part Of: Ceramics international. Volume 42:Issue 14(2016)
• Page Start: 15242
• Page End: 15246
• Publication Date: 2016-11-01
• Subjects: Microwave dielectric properties -- LTCC -- CaWO4 -- Li2TiO3; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.06.161
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this work, 0.86CaWO4 –0.14Li2 TiO3 ceramics were prepared via a traditional solid-state process. The effects of Li2 O–B2 O3 –SiO2 –CaO–Al2 O3 (LBSCA) addition on the phase formation, sintering character, microstructure and microwave dielectric properties of the ceramics were investigated. A small amount of LBSCA addition could effectively lower the sintering temperature of the ceramics. X-ray diffraction analysis revealed that CaWO4 and Li2 TiO3 phases coexisted without producing any other crystal phases in the sintered ceramics. The dielectric constant and Qf values were related to the amount of LBSCA addition and sintering temperatures. All specimens could obtain near-zero temperature coefficient ( τ f ) values through the compensation of the positive τ f of Li2 TiO3 and the negative τ f of CaWO4 . The 0.86CaWO4 –0.14Li2 TiO3 ceramic with 0.5 wt% LBSCA addition and sintered at 900 °C for 3 h exhibited excellent microwave dielectric properties of ε r =12.43, Qf =76, 000 GHz and τ f =−2.9 ppm/°C.