The non-stoichiometric Li₃Mg₂Sb_1−xO₆ (0.05 ⩽ x ⩽ 0.125) compounds have been prepared via the mixed oxide method. The influences of Sb nonstoichiometry on the sintering behavior, microstructure, phase composition along with microwave dielectric performances for Li₃Mg₂Sb_1−xO₆ ceramics were studied. Combined with X-ray diffraction (XRD) and Raman spectra, it was confirmed that phase composition could not be affected by the Sb nonstoichiometry and almost pure phase Li₃Mg₂SbO₆ was formed in all compositions. Appropriate Sb-deficiency in Li₃Mg₂SbO₆ not only lowered its sintering temperature but also remarkably improved its Q×f value. In particular, non-stoichiometric Li₃Mg₂Sb_0.9O₆ ceramics sintered at 1250 °C/5 h owned seldom low dielectric constant ε_r = 10.8, near-zero resonant frequency temperature coefficient τ_f = −8.0 ppm/°C, and high quality factor Q×f = 86,300 GHz (at 10.4 GHz). This study provides an alternative approach to ameliorate its dielectric performances for Li₃Mg₂SbO₆-based compounds through defect-engineering.

非化学计量的锂₃的Mg ₂ Sb的_1-X Ö ₆（0.05⩽ X ⩽0.125）化合物已通过混合氧化物的方法制备。研究了Sb的非化学计量对Li ₃ Mg ₂ Sb _1-x O ₆陶瓷的烧结行为，微观结构，相组成以及微波介电性能的影响。结合X射线衍射（XRD）和拉曼光谱，证实了相组成不受Sb非化学计量和几乎纯的Li ₃ Mg ₂ SbO _{6相的影响}在所有成分中均形成。Li ₃ Mg ₂ SbO _6中适当的Sb缺陷不仅降低了其烧结温度，而且显着提高了其Q × f值。特别地，非化学计量的锂₃的Mg ₂ Sb的_0.9 ø ₆陶瓷在很少拥有的低介电常数1250℃/ 5小时烧结ε _{- [R} = 10.8，接近零的共振频率的温度系数τ _˚F = -8.0 PPM /℃，高品质因数Q × f= 86,300 GHz（在10.4 GHz时）。这项研究提供了一种通过缺陷工程改善基于Li ₃ Mg ₂ SbO ₆的化合物的介电性能的替代方法。