Sintering behavior, structure, and microwave properties of novel Li2xCu1-xMoO4 ceramics

In this study, we prepared a novel series of Li2xCu1-xMoO4 (x = 0.02, 0.04, 0.06, 0.08, and 0.10) microwave ceramics. The dynamic sintering behavior, crystal phases, micro-morphologies, and dielectric properties of the samples were studied. The substitution of Li+ contributed to refining the crystal grain size, promoting the densification of microstructure, and enhancing the quality factor. Due to different valence substitutions, Cu+ ions were created, which were verified by X-ray photoelectron spectroscopy (XPS) and Raman experiments. In addition, the Raman shift, full width at half maximum (FWHM) value of the A1g peak, and crystal microstrains were analyzed to gain a mechanistic understanding of the influence of structure on the dielectric properties. When x = 0.08, the Li2xCu1-xMoO4 ceramic sintered at 675 C exhibited optimal comprehensive properties with epsilon(r )= 8.17, Qf = 68 476 GHz, and tau(f) = -25 ppm/ C, and good chemical stability between the ceramic and Al electrode was also achieved. These promising properties make Li2xCu1-xMoO4 (x = 0.08) more suitable for ultra low temperature co-fired ceramic (ULTCC) applications.

Automated summary

In this study, novel Li2xCu1-xMoO4 microwave ceramics were prepared and their properties were evaluated. The substitution of Li+ and the creation of Cu+ ions improved the grain size, microstructure densification, and quality factor. The influence of structure on dielectric properties was analyzed, and the ceramic exhibited optimal properties at x = 0.08. The ceramic also showed good chemical stability with the electrode, making it suitable for ultra low temperature co-fired ceramic applications.