)O 3 (PBLZST) antiferroelectric (AFE) ceramics have been prepared by hot-press sintering method and conventional solid-state reaction process, and the dependence of microstructure and energy storage properties of the ceramics on sintering approaches has been studied. The results reveal that not only the microstructure, but also the electrical properties of the PBLZST AFE ceramics are significantly improved by using the hot-press sintering method. Samples resulting from the hot-press sintering process have high breakdown strength of 180 kV/cm which results from the increase of density. Coupled with large polarization, the hotpressed AFE ceramics are shown to have a high recoverable energy density of 3.2 J/cm 3 . The recoverable energy density of the hot-pressed PBLZST AFE ceramics is 100% greater than the conventional sintered specimens with recoverable energy density of 1.6 J/cm 3 .

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Porous Ba0.67Sr0.33TiO3 (BST) ceramics were fabricated by the solid‐state reaction process, and their micro‐structural, dielectric, and pyroelectric properties were systemically investigated. Compared with dense specimens, porous BST exhibited a higher pyroelectric coefficient (p), a lower dielectric constant (ɛ), and heat capacity (CV), which are beneficial for the development of pyroelectric devices. At room temperature, as the porosity increased from 1.0% to 9.6%, BST ceramics' pyroelectric coefficient increased from 5000 to 8000 μc·(m2·°C)–1, the dielectric constant decreased from 12 000 to 8000, while the dielectric losses were <1.0% and the figure‐of‐merit increased from 11.0 × 10−5 to 27.0 × 10−5Pa−0.5. Improvement of pyroelectric property is benecial for the development of infrared detectors.

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A series of multiwall carbon nanotube/low density polyethylene composite films with different thicknesses and different carbon nanotube volume fractions was prepared and studied. The result showed an interesting phenomenon which has not been reported before: when the thickness was reduced to the length range of the carbon nanotube filler, it could remarkably affect the percolation threshold of the composite films. Classical theories have been introduced to describe the phenomenon. This result could have significance in future applications of percolative composite thin/thick films.