Lead-free ceramic-polymer nanocomposites comprising poly (vinylidene fluoride) (PVDF) and homogeneously dispersed Bi_3·3La_0·7Ti₃O₁₂ (BLT) ceramic particles were synthesized using the solution casting method. The effect of BLT addition on the growth rate of different crystalline phases of PVDF was systematically investigated. X-ray diffraction analysis showed the presence of β-phase in all the composite samples. FTIR and Raman spectroscopy analysis also confirmed the enhancement in the electroactive β and γ phases with BLT addition. The fraction of β-phase i.e., $F\left(\beta \right)\%$ has been found to be 64.5% at 10 wt % BLT loading. The homogeneous distribution of ceramic particles in PVDF matrix was confirmed using field emission scanning electron microscopic analysis. The dielectric constant of the nanocomposites with 10 wt % of BLT loading can reach up to 53.5 at 100 Hz, which is attributed to the enhanced interfacial polarization and relative enhancement of electroactive phases of PVDF. The temperature-dependent dielectric measurement shows an enhancement in the dielectric constant with increasing temperature. The nanocomposites also exhibit excellent ferroelectric properties with enhancement in remanent polarization. This work suggests the possibility of enhancing the electroactive phases of PVDF with superior dielectric and ferroelectric properties. These lead-free nanocomposites may prove to have a tremendous potential in flexible sensors, data storage, and energy harvesting applications.

采用溶液浇铸法合成了由聚偏二氟乙烯（PVDF）和均匀分散的Bi _3·3 La _0·7 Ti ₃ O ₁₂（BLT）陶瓷粒子组成的无铅陶瓷聚合物纳米复合材料。系统地研究了BLT添加对PVDF不同晶相生长速率的影响。X射线衍射分析表明在所有复合样品中都存在β相。FTIR和拉曼光谱分析也证实了通过添加BLT可以增强电活性β和γ相。β相的分数，即$F（\beta ）％$已经发现在10wt％的BLT负载下为64.5％。使用场发射扫描电子显微镜分析确定了PVDF基质中陶瓷颗粒的均匀分布。BLT含量为10 wt％的纳米复合材料的介电常数在100 Hz时可以达到53.5，这归因于PVDF的界面极化增强和电活性相的相对增强。与温度有关的介电测量结果表明，介电常数随温度升高而提高。纳米复合材料还表现出优异的铁电性能，同时剩余极化增强。这项工作表明，可以增强具有优良介电和铁电性能的PVDF的电活性相。