采用TiO₂、CaCO₃、Mg（OH）₂为原料，通过高温固相法合成了钛酸钙镁（0.95MgTiO₃-0.05CaTiO₃）粉体，并基于相图设计制备了Li₂B₄O₇-Al₂O₃低熔点烧结助剂，在此基础上实现钛酸钙镁微波介质陶瓷的低温烧结制备。研究了合成温度（900~1100 ℃）对钛酸钙镁粉体物相组成的影响，以及烧结温度（1175~1250 ℃）、烧结助剂添加量（1%~5%，质量分数，下同）对钛酸钙镁陶瓷密度、微观结构、介电常数、品质因数和频率温度系数等的影响规律。结果表明，当反应温度为1100 ℃时，可制备高纯度的0.95MgTiO₃-0.05CaTiO₃陶瓷粉体；烧结助剂的引入有效降低陶瓷的烧结温度，但过高（5%）的添加量反而导致密度和介电性能下降；当助剂添加比例为3%且烧结温度为1225 ℃时，可获得相对密度为98.70%，介电常数为20.38，品质因数为37240 GHz和频率温度系数为-9.6×10^-6 ℃^-1的钛酸钙镁陶瓷材料。

In this study， 0.95MgTiO₃-0.05CaTiO₃ powders are synthesized via a high-temperature solid-phase reaction， utilizing TiO₂，CaCO₃，and Mg（OH）₂ as the primary reactants. Guided by the phase diagram， sintering aids comprising Li₂B₄O₇-Al₂O₃， which possess a low melting point， are formulated to facilitate the low-temperature sintering process of 0.95MgTiO₃-0.05CaTiO₃ microwave dielectric ceramics. The study comprehensively investigates the influence of the synthesis temperature （900-1100 ℃） on the phase composition of calcium magnesium titanate powder， as well as the effects of sintering temperature （1175-1250 ℃） and aid content （1%-5%， mass fraction， the same below） on the density， microstructure， dielectric constant， quality factor， and frequency-temperature coefficient of calcium magnesium titanate ceramics. The results indicates that 0.95MgTiO₃-0.05CaTiO₃ powders could be successfully synthesized at a reaction temperature of 1100 ℃. The incorporation of sintering aids effectively reduced the sintering temperature of the ceramics. However， excessive addition （5%） resulted in decreased density and dielectric properties. Optimal performance is achieved with an aid content of 3% and a sintering temperature of 1225 ℃， producing 0.95MgTiO₃-0.05CaTiO₃ ceramic with a relative density of 98.70%， a dielectric constant of 20.38， a quality factor of 37240 GHz， and a frequency-temperature coefficient of -9.6×10^-6 ℃^-1.