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Dielectric composites boost the family of energy storage and conversion materials as they can take full advantage of both the matrix and filler. This review aims at summarizing the recent progress in developing high‐performance polymer‐ and ceramic‐based dielectric composites, and emphases are placed on capacitive energy storage and harvesting, solid‐state cooling, temperature stability, electromechanical energy interconversion, and high‐power applications. Emerging fabrication techniques of dielectric composites such as 3D printing, electrospinning, and cold sintering are addressed, following by highlighted challenges and future research opportunities. The advantages and limitations of the typical theoretical calculation methods, such as finite‐element, phase‐field model, and machine learning methods, for designing high‐performance dielectric composites are discussed. This review is concluded by providing a brief perspective on the future development of composite dielectrics toward energy and electronic devices.

Quenching has been demonstrated to increase the thermal stability of the piezoelectric properties of relaxor (1−x)Na1/2Bi1/2TiO3-xBaTiO3 (NBTxBT) by 40 °C. This work establishes a correlation between the quenching temperature and salient electrical (conductivity, piezoelectric and dielectric) properties of two NBTxBT variants. The impact of quenching on the mechanical properties is quantified in terms of changes in Young's modulus. The perspective for application is interrogated using a variation in the sample thickness and separating the sample interior from the sample surface. An in situ measurement of surface temperature during the quenching treatment is applied to validate the simulation for thickness-dependent thermal transport in the material and ensuing transient thermal stresses. The calculated stress intensity factor is then compared with the fracture toughness of the material. This study asserts that air quenching can be conducted without mechanical degradation. Thus, it can be an important alternative to existing industrial strategies to enhance the thermal stability of the piezoelectric properties of relaxor NBTxBT.