Sr_1+xSm₂Al₂O_7+x (0 ≤ x ≤ 0.05) ceramics were prepared by a conventional solid-state reaction method. Slight Sr²⁺ nonstoichiometry dramatically enhanced the microwave dielectric performance of the ceramics. Compared with the stoichiometric material, Sr-deficient ceramics show greatly enhanced microwave dielectric properties. For x = 0.03, the ceramics exhibited good microwave dielectric properties of ε_r = 18.31, Q × f = 78,000 GHz and τ_f = 2.28 ppm/°C. ZnO and LiF sintering aids were added to the ceramic to reduce the presintering temperature and enhance the microwave dielectric properties of the ceramics. After 0.25 wt% ZnO and 0.25 wt% LiF were added, the ceramics exhibited microwave dielectric properties of ε_r = 19.40, Q × f = 81,400 GHz and τ_f = 3.27 ppm/°C.

锶_{1+ X}的Sm ₂的Al ₂ ö _{7+ X}（0≤ X ≤0.05）通过常规的固相反应法制备陶瓷。轻微的Sr ²⁺非化学计量比极大地提高了陶瓷的微波介电性能。与化学计量材料相比，缺乏Sr的陶瓷显示出大大增强的微波介电性能。对于X = 0.03，陶瓷表现出良好的介电性能ε _{- [R} = 18.31，Q×˚F = 78000 GHz和τ _˚F＝ 2.28ppm /℃。ZnO和LiF烧结助剂添加到陶瓷中以降低预烧结温度并增强陶瓷的微波介电性能。加入0.25重量％的ZnO和0.25重量％的LiF之后，陶瓷表现出的微波介电性能ε _{- [R} = 19.40，Q×˚F = 81400 GHz和τ _˚F = 3.27 PPM /℃。