Abstract Perovskite–polymer hybrids are fascinating materials combining improved physical properties with a flexibility that make them very suitable for electric and optoelectronic devices and applications. In the present work, nano-sized BiFeO3 and NaTiO3 were mixed with polymethyl methacrylate (PMMA) by solution casting to obtain transparent nanocomposite films. The structural properties, interactions between the film constituents as well as film thickness were evaluated by using X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy combined with energy–dispersive spectroscopy. The composite films were nonporous of semicrystalline nature. The NaTiO3 interacted strongly with PMMA molecules than BiFeO3. Nano-filler incorporation narrowed the optical bandgap significantly while maintaining a reasonably high transmittance. The dielectric constant of composite films was higher than that of pure polymer maintaining a low dielectric loss. The effect of these perovskites on the dielectric modulus, relaxation, and ac conductivity were discussed. The prepared composites are suitable for integral thin film capacitors, electric stress control devices, and bio-engineering systems.

中文翻译：

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(BiFeO3 或 NaTiO3)–PMMA 的结构、光学特性和弛豫方面：用于介电应用的混合薄膜

摘要 钙钛矿-聚合物杂化物是一种迷人的材料，结合了改进的物理性能和柔韧性，使其非常适合于电气和光电器件和应用。在目前的工作中，通过溶液浇铸将纳米尺寸的 BiFeO3 和 NaTiO3 与聚甲基丙烯酸甲酯 (PMMA) 混合，以获得透明的纳米复合薄膜。通过使用 X 射线衍射、傅里叶变换红外光谱和扫描电子显微镜结合能量色散光谱来评估结构特性、膜成分之间的相互作用以及膜厚度。复合膜是无孔的半结晶性质。NaTiO3 与 PMMA 分子的相互作用强于 BiFeO3。纳米填料的加入显着缩小了光学带隙，同时保持了相当高的透射率。复合薄膜的介电常数高于纯聚合物的介电常数，并保持较低的介电损耗。讨论了这些钙钛矿对介电模量、弛豫和交流电导率的影响。制备的复合材料适用于整体薄膜电容器、电应力控制装置和生物工程系统。