TY  - JOUR
AU  - Dai, Kai
AU  - Cui, Anyang
AU  - Li, Yafang
AU  - Liu, Zhen
AU  - Yan, Yuting
AU  - Jiang, Kai
AU  - Zhang, Jinzhong
AU  - Shang, Liyan
AU  - Zhu, Liangqing
AU  - Li, Yawei
AU  - Wang, Genshui
AU  - Hu, Zhigao
PY  - 2024
TI  - High pressure phase boundaries of AgNbO3
JO  - Journal of Materiomics
SN  - 2352-8478
SP  - 431
EP  - 439
VL  - 10
IS  - 2
AB  - The external pressure is one of the essential parameters for regulating the structure and energy conversion properties of antiferroelectric AgNbO3. For pure AgNbO3, however, there has been still a blank of its real lattice structure under the stress field. Here, high-pressure lattice structures and phase transitions of AgNbO3 have been explored by spectroscopic experiments and theoretical models. A successive phase transition process from Pbcm to C2221 to P21 has been observed at the pressure range of 0–30 GPa, associated with displacive-type characterized by soft-mode kinetics. Note that the paraelectric phase cannot be achieved under high-pressure at room temperature. Significantly, the competition of long-range Coulomb force, short-range interatomic interaction, and covalent interaction in AgNbO3 lattice were demonstrated under the stress field. The present work can provide fundamental guidelines to reveal the high-pressure phase transitions of AgNbO3, which will open up possibilities for the designing device with functional properties at extremes.
UR  - https://doi.org/10.1016/j.jmat.2023.07.004
DO  - 10.1016/j.jmat.2023.07.004