Polar Nitride Perovskite LaWN_3-δ with Orthorhombic Structure.

ABSTRACT: Nitride perovskite LaWN₃ has been predicted to be a promising ferroelectric material with unique properties for diverse applications. However, due to the challenging sample preparation at ambient pressure, the crystal structure of this nitride remains unsolved, which results in many ambiguities in its properties. Here, the authors report a comprehensive study of LaWN₃ based on high-quality samples synthesized by a high-pressure method, leading to a definitive resolution of its crystal structure involving nitrogen deficiency. Combined with theoretical calculations, these results show that LaWN₃ adopts an orthorhombic Pna2₁ structure with a polar symmetry, possessing a unique atomic polarization along the c-axis. The associated atomic polar distort

SUBMITTER: Zhou X 

PROVIDER: S-EPMC10323622 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature