Abstract
In order to eliminate the porous structure caused by lithium volatilization and explore the sintering mechanism and structure dependence of dielectric characteristics, lithium fluoride (LiF) as a sintering aid was adopted to prepare Li
2
Mg
3
TiO
6−x
LiF ([Formula: see text]–5 wt.%) samples. The effects of LiF additive on phase components, morphology, sintering characteristics and dielectric characteristics of Li
2
Mg
3
TiO
6
were studied. The results showed that modest LiF addition can reduce sintering temperature from 1280
∘
C to 900
∘
C. The structure and refinement analysis demonstrated that samples maintain a single structure within 0 wt.%[Formula: see text]4 wt.%. The morphology analysis confirmed that the porosity and grain size of Li
2
Mg
3
TiO
6−x
LiF ceramics gradually decreased with increasing LiF. The dielectric constant ([Formula: see text] and quality factor ([Formula: see text]) showed a trend of increasing first and then decreasing, which was strongly associated with density, ionic polarization, phase components, lattice energy, packing fraction and grain size. In addition, the Li
2
Mg
3
TiO
6−4
wt.% LiF sample sintered at 900
∘
C exhibited outstanding dielectric characteristics: [Formula: see text], [Formula: see text] [Formula: see text]GHz and [Formula: see text] [Formula: see text]ppm/
∘
C.