Effects of LBSCA glass addition on sintering behavior, Raman spectroscopy, and microwave dielectric properties of LiNb0.6Ti0.5O3 ceramics

In this study, LiNb0.6Ti0.5O3 (LNT) ceramics with x wt.% (0 < x < 2.0) of added Li2O-B2O3-SiO2-CaO-Al2O3 (LBSCA) glass were prepared by conventional solid-state reaction method. Effects of LBSCA glass on phase composition, microstructure, lattice vibration, and microwave dielectric properties of the LNT-x wt.% LBSCA ceramics were investigated. X-ray diffraction analysis confirmed the formation of single-phase Li1.075Nb0.625-Ti0.45O3 in all samples. Combined with Raman spectroscopy, it was suggested that the microwave dielectric properties were highly associated with the bulk density, the vibration damping behavior, the Nb-O bond strength, and the degree of order in crystal structure. Introduction of LBSCA glass resulted in effective decrease in the sintering temperature to 925 degrees C and contributed to the improvement of quality factor (Q x f) value. The LNT0.4 wt% LBSCA sample sintered at 925 degrees C exhibited excellent microwave dielectric properties with epsilon(r) = 62.9, Q x f = 7561 GHz, and tau(f) = 12.56 ppm/degrees C coupled with good chemical compatibility with silver), which offers good application prospects in the field of low-temperature co-fired ceramic technology.

Automated summary

The addition of LBSCA glass was found to significantly influence the microwave dielectric properties of LNT ceramics, improving the quality factor and reducing the sintering temperature. After sintering at 925 degrees C, the sample with 0.4 wt% LBSCA exhibited excellent performance, making it suitable for low-temperature co-fired ceramic technology.