Orthorhombic nitride perovskite CeTaN3-{\delta} with switchable and robust ferroelectric polarization
Abstract
Perovskite-type ternary nitrides with predicted exciting ferroelectricity and many other outstanding properties hold great promise to be an emerging class of advanced ferroelectrics for manufacturing diverse technologically important devices. However, such nitride ferroelectrics have not yet been experimentally identified, mainly due to the challenging sample synthesis by traditional methods at ambient pressure. Here we report the successful high-pressure synthesis of a high-quality ferroelectric nitride perovskite of CeTaN3-{\delta} with nitrogen deficiency, adopting an orthorhombic Pmn21 polar structure. This material is electrically insulating and exhibits switchable and robust electric polarization for producing ferroelectricity. Furthermore, a number of other extraordinary properties are also revealed in this nitride such as excellent mechanical properties and chemical inertness, which would make it practically useful for many device-relevant applications and fundamentally important for the study of condensed-matter physics.
Keywords
Cite
@article{arxiv.2507.21825,
title = {Orthorhombic nitride perovskite CeTaN3-{\delta} with switchable and robust ferroelectric polarization},
author = {Guozhu Song and Xiangliang Zheng and Xiaodong Yao and Xuefeng Zhou and Chao Gu and Qinghua Zhang and Jian Chen and Chenglu Huang and Tiancheng Yang and Leiming Fang and Ping Miao and Lingxiang Bao and Wen Yin and Xiaohui Yu and Jinlong Zhu and Wei Bao and Yusheng Zhao and Erjia Guo and Shanmin Wang},
journal= {arXiv preprint arXiv:2507.21825},
year = {2025}
}