A series of 0.9625MgTiO₃‐0.0375(Ca_0.5Sr_0.5)TiO₃ composite ceramics added with different amounts of B₂O₃ (1‐5 wt%) were prepared via the solid state sintering method using the pre‐synthesized raw MgTiO₃ and (Ca_0.5Sr_0.5)TiO₃ powders by molten‐salt reaction. The sintering temperature of 0.9625MgTiO₃‐0.0375(Ca_0.5Sr_0.5)TiO₃ composite ceramics can be reduced from 1275°C to 1175°C due to the liquid phase sintering effect of B₂O₃. When the adding amount of B₂O₃ was more than 2 wt%, a new phase MgTi₂O₅ could be detected by X‐ray diffraction, which would substantially degrade the dielectric properties of the obtained ceramics. Resultantly, the quality factor (Q·f) and dielectric constant (ε_r) of the samples increase first and decrease later with increasing addition amount of B₂O₃. In addition, the temperature coefficient of resonant frequency (τ_f) progressively increases with increasing content of B₂O₃. By sintering at 1175°C for 4 hours, the obtained 0.9625MgTiO₃‐0.0375Ca_0.5Sr_0.5TiO₃ composite ceramics with 2 wt% B₂O₃ possess the optimal microwave dielectric properties of ε_r = 18.9, Q·f = 57 000 GHz and τ_f = −1.2 ppm/°C.

中文翻译：

---

添加B2O3对0.9625MgTiO3-0.0375（Ca0.5Sr0.5）TiO3复合陶瓷微波介电性能的影响

采用预合成的生MgTiO _3，通过固态烧结法制备了一系列添加有不同量的B ₂ O ₃（1-5 wt％）的0.9625MgTiO ₃ -0.0375（Ca _0.5 Sr _0.5）TiO ₃复合陶瓷。（Ca _0.5 Sr _0.5）TiO ₃粉末通过熔融盐反应。B ₂ O ₃的液相烧结作用可以将0.9625MgTiO ₃ ‐0.0375（Ca _0.5 Sr _0.5）TiO ₃复合陶瓷的烧结温度从1275°C降至1175°C。。当B ₂ O ₃的添加量大于2 wt％时，可以通过X射线衍射检测到新相MgTi ₂ O ₅，这将大大降低所得陶瓷的介电性能。作为结果，品质因数（Q · ˚F）和介电常数（ε _{- [R}样品）增加第一和后来随着B的添加量减少₂ ö ₃。此外，谐振频率（的温度系数τ _˚F）与B的含量增加逐渐增加₂ ö ₃。通过在1175℃下烧结4小时，将得到的0.9625MgTiO ₃ -0.0375Ca _0.5锶_0.5的TiO ₃复合物与2重量％B陶瓷₂ ö ₃具有的最佳微波介电性能ε _{- [R}  = 18.9，Q·˚F  = 57 000 GHz和τ _˚F  = -1.2 PPM /℃。