Synthesis of low temperature firing scheelite-type BaWO4 microwave dielectric ceramics with high performances. Issue 1 (1st January 2022)

• Record Type: Journal Article
• Authors: Gui, Ling; Yang, Hongcheng; Zhao, Qian; Li, Enzhu
• Is Part Of: Ceramics international. Volume 48:Issue 1(2022)
• Page Start: 1360
• Page End: 1365
• Publication Date: 2022-01-01
• Subjects: BaWO4 -- Microwave dielectric ceramic -- High Q×f -- LTCC; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.09.220
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The synthesis of scheelite-structured BaWO4 ceramics at low temperatures using a Li2 O–B2 O3 –BaCO3 –CuO (LBBC) glass frit is reported in this study. Composite ceramics with the chemical formula BaWO4 - x LBBC ( x = 0.25, 0.5, 1, and 2 wt%) were synthesized via the standard solid-phase method. A compact BaWO4 matrix containing glass crystallized when sintered at 850 °C for only 30 min. The BaWO4 ceramic with 1 wt% LBBC glass exhibits optimum microwave dielectric performance with Q × f = 58, 855 GHz, εr = 8.33, and τ f = −61.43 ppm/°C. A results of XRD and SEM analyses, microwave properties and the liquid-phase sintering mechanism for the ceramics are presented. Highlights: The Q × f value remained excellent for 58855 GHz while the temperature decreased from 1100 °C to 850 °C. The compound was still the pure BaWO4 phase. The shorter soaking time (30min) can effectively reduce the energy consumption.