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Dielectric constant of Li2O–MO–WO3 (M = Co, Ni, Ca, Ba) ceramics sintered at different temperatures for 6 h
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The Li2O–MO–WO3 (M = Co, Ni, Ca, Ba) ceramics for ultra-low temperature co-fired ceramic application were prepared by using the conventional solid-state reaction route. The phase composition, microstructures, and microwave dielectric properties of the compounds were investigated systematically. The X-ray diffraction patterns show that the Li2O–MO–W...
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Citations
... There are three most commonly reported ULTCC materials: molybdate-, tungstate-, and vanadate-oxides [25][26][27][28][29][30]. Among them, vanadium oxide is the most attractive, not only because of its good dielectric characteristics, but also because the cost of the raw material V 2 O 5 is lower than that of MoO 3 and WO 3 , making it a more competitive product in the application markets [31]. ...
Pure and Mg-substituted AgCaVO4 compounds were explored using the conventional solid-state sintering method and their microwave dielectric properties were investigated. The XRD patterns indicate all samples belong to an orthorhombic structure with a space group of Pmna. The pure AgCaVO4 ceramic gives the dielectric properties: εr of 11.7, Q × f of 15,000 GHz, and τf of38 ppm/°C at 530 °C. The value of τf is correlated with the bond valence. In a limited range (x = 0.03–0.05), a small amount of Mg substitution can not only reduce the dielectric loss, but also increase the dielectric constant of the AgCa1−xMgxVO4 specimen. AgCa0.97Mg0.03VO4 ceramic sintered at 530 °C exhibits optimum properties of εr = 12, Q × f = 23,000 GHz and τf = –35 ppm/°C at microwave frequencies. The ceramic also shows good chemical compatibility with aluminum, providing a promising candidate for ULTCC applications.
The synthesis of scheelite-structured BaWO4 ceramics at low temperatures using a Li2O–B2O3–BaCO3–CuO (LBBC) glass frit is reported in this study. Composite ceramics with the chemical formula BaWO4-xLBBC (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 τf = −61.43 ppm/°C. A results of XRD and SEM analyses, microwave properties and the liquid-phase sintering mechanism for the ceramics are presented.
