Materials with high dielectric permittivity are in demand due to their potential applications in microelectronics, capacitors and related fields. Polymer/ceramic composites, due to their improved properties, can be studied to meet this demand. In this work, high permittivity double perovskite Sr₂TiMnO₆ (STMO) ceramics were synthesized by solid state reaction route and polystyrene (PS) composite thick films (∼200 μm) with up to 50 vol% loading of STMO were prepared by solution casting technique. The composite films were characterized using X-ray diffraction and Fourier transform infra-red spectroscopy for their structural properties. Microstructure of the composites was examined using scanning electron microscopy. Thermal behavior was studied using differential scanning calorimetry and thermo-gravimetric analysis. Dielectric properties, such as permittivity, loss and AC conductivity were measured using a dielectric impedance analyzer. Permittivity and dielectric loss of the base polymer were found to increase with the addition of STMO. Glass transition for composites shifted to higher temperature than that of pure PS. The composites exhibited enhanced thermal stability and these composite films can be explored as dielectric materials for capacitor applications.

由于其在微电子、电容器和相关领域的潜在应用，需要具有高介电常数的材料。可以研究聚合物/陶瓷复合材料，因为它们具有改进的性能，以满足这一需求。在这项工作中，高介电常数双钙钛矿 Sr ₂ TiMnO ₆(STMO) 陶瓷通过固态反应途径合成，聚苯乙烯 (PS) 复合厚膜 (~200 μm) 具有高达 50 vol% 的 STMO 负载量通过溶液浇铸技术制备。使用X射线衍射和傅里叶变换红外光谱表征复合膜的结构特性。使用扫描电子显微镜检查复合材料的微观结构。使用差示扫描量热法和热重分析来研究热行为。使用介电阻抗分析仪测量介电特性，例如介电常数、损耗和交流电导率。发现基础聚合物的介电常数和介电损耗随着 STMO 的加入而增加。复合材料的玻璃化转变温度高于纯 PS。