Ferroelectric anomaly of perovskite layer structured Pb2+-doped Sr2Nb2O7 ceramics
AffiliationShanghai Institute of Ceramics; Chinese Academy of Sciences; Nanchang Hangkong University; Queen Mary University of London; University of Chester
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AbstractThe spontaneous polarization of perovskite layer structured Sr2Nb2O7 ferroelectrics (FEs) is originated from mainly the oxygen octahedral rotations and partially the displacement of Sr2+ ions. However, there is FE anomaly of showing the typical characteristics of antiferroelectric (AFE)‐like behavior with double polarization–electric field hysteresis loops of Sr2Nb2O7 ceramics by Pb doping. Here, combinations of low frequency and sub‐terahertz band dielectric measurements under applied DC field reveal field‐induced transition from AFE to FE structure. Temperature dependence of dielectric constant suggested a second‐order phase transition near 215°C, which further supported by the lattice parameters and thermal expansion coefficient extracted from the variable temperature X‐ray diffraction in the heating and cooling processes. The selected area electron diffraction results show no new superlattice spots are observed along [1 0 0] zone axis related to c direction. We proposed a model based on octahedral tilting/rotation that accounted for the incommensurate lattice modulation in the c direction for Sr2Nb2O7 system by Pb doping. All the results show AFE‐like behavior be likely to origin from the electron structures of Pb2+ with a 6s2 lone pair. Our results gave us a new concept provide possibilities for the design of AFE‐like materials in layer structured compounds with super high FE Curie point.
CitationLiu, L., Chen, T., Ouyang, D., Yue, Y., Yang, B., Yan, H., Abrahams, I., Fu, Z., Liang, R., & Zhou, Z. (2024). Ferroelectric anomaly of perovskite layer structured Pb2+-doped Sr2Nb2O7 ceramics. Journal of the American Ceramic Society, vol(issue), pages. https://doi.org/10.1111/jace.19669
DescriptionThis is the peer reviewed version of the following article: [Liu, L., Chen, T., Ouyang, D., Yue, Y., Yang, B., Yan, H., Abrahams, I., Fu, Z., Liang, R., & Zhou, Z. (2024). Ferroelectric anomaly of perovskite layer structured Pb2+-doped Sr2Nb2O7 ceramics. Journal of the American Ceramic Society, vol(issue), pages], which has been published in final form at [https://doi.org/10.1111/jace.19669]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.