In this article, garnet-type Y₃Al₅O₁₂ (YAG) were doped with Mg²⁺-Si⁴⁺ ionic pairs and its effect on the structure and the microwave dielectric properties was investigated. It was revealed that in ceramics Y₃Mg_xAl_5-2xSi_xO₁₂ (x = 0, 0.5, 1.0, 1.5, 2.0), increasing doping concentration decreased the sintering temperature and time for the optimal densification. X-ray diffraction studies showed that the samples are isostructural to Al₅Y₃O₁₂ garnet. All sample were formed a single phase except for x = 2.0, where a secondary peak was detected. Excellent microwave dielectric properties of ε_r = 10.56, Q × f = 67,571 GHz and τ_f = -35.23 ppm/°C were obtained for Y₃Mg_0.5Al₄Si_0.5O₁₂ ceramics sintered at 1625 °C for 5 h. The factors influencing the microwave dielectric properties of Y₃Mg_xAl_5-2xSi_xO₁₂ ceramics were further discussed by considering the ionic polarization, packing fraction, average grain size and chemical bond valence theory.

本文采用Mg ²⁺ -Si ⁴⁺离子对掺杂石榴石型Y ₃ Al ₅ O ₁₂ (YAG)，研究了其对结构和微波介电性能的影响。结果表明，在陶瓷 Y ₃ Mg _x Al _{5-2 x} Si _x O ₁₂ ( x  = 0, 0.5, 1.0, 1.5, 2.0)中，增加掺杂浓度会降低烧结温度和最佳致密化时间。X 射线衍射研究表明样品与 Al ₅ Y ₃ O _12同构石榴石。除x = 2.0外，所有样品均形成单相 ，其中检测到第二个峰。_{Y 3} Mg _0.5 Al ₄ Si _0.5 O ₁₂陶瓷在 1625 °C 下烧结 5 小时后，获得了ε _r  = 10.56、Q  ×  f  = 67,571 GHz 和τ _f  = -35.23 ppm/°C 的优异微波介电性能。_{Y 3} Mg _x Al _{5-2 x} Si _x O ₁₂微波介电性能的影响因素通过考虑离子极化、填充率、平均晶粒尺寸和化学键价理论进一步讨论了陶瓷。