Realizing a ferroelectric state and high pyroelectric performance in antiferroelectric-oxide composites
We report a robust room temperature ferroelectric (FE) state in (1 − x)Pb0.99Nb0.02[(Zr0.57Sn0.43)0.933Ti0.067]0.98O3–xZnO ((1 − x)PNZST–xZnO) composites, where PNZST shows a predominant antiferroelectric (AFE) nature due to ZnO-induced internal strain. Upon heating, a FE-AFE transition occurs and generates high pyroelectric performance. The composite with x = 0.1 shows a peak pyroelectric coefficient of p = 2450.7 × 10−4 C m−2 K−1 and figures of merit of current responsivity Fi = 926.9 × 10−10 m V−1, voltage responsivity Fv = 1334.3 × 10−2 m2 C−1, and detectivity Fd = 1194.8 × 10−5 Pa−1/2, which are about two orders of magnitude higher than those of most perovskite pyroelectric oxides. More interestingly, the FE-AFE transition temperature, i.e., the temperature corresponding to peak pyroelectric performance, is tunable in a wide temperature range from 30 °C to 65 °C. This work not only provides a promising material candidate for high performance pyroelectric devices, but also an alternative idea to develop ferroelectric and pyroelectric properties based on antiferroelectric materials.