Abstract
The structure and microstructure of the (1−x) Li2.08TiO3+xLiF (0.11≤x≤0.14) ceramics were studied by X-ray powder diffraction (XRD), thermal dilatometry and scanning electron microscopy (SEM). The microwave dielectric properties of the ceramics were studied with a network analyzer. All samples exhibited single monoclinic phase. The sintering temperature was successfully reduced to about 900°C/2h for the LiF-doped Li2.08TiO3 specimens. The dielectric permittivity slightly decreased, whereas the Q×f value changed little, with the increase in LiF dopant. The temperature coefficient of resonant of frequency (τf) value changed from positive to negative with increasing x, and a near zero value was obtained at x=0.13 composition. Optimized microwave dielectric properties with ɛr=∼22.8, Q×f=∼63,000GHz and τf=∼1.0ppm/°C for x=0.13 composition sintered at 900°C/2h. The XRD and back scattering SEM analysis showed that the ceramic was compatible with Ag powders after sintering at 900°C/2h.
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