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.

_{外部压力是调节反铁电AgNbO 3}结构和能量转换性能的重要参数之一。然而，对于纯AgNbO ₃，其在应力场下的真实晶格结构仍然存在空白。在这里，通过光谱实验和理论模型探索了AgNbO ₃的高压晶格结构和相变。_{从 Pbcm 到 C222 1}到 P2 ₁的连续相变过程在 0-30 GPa 的压力范围内观察到，与以软模式动力学为特征的位移型相关。请注意，在室温高压下无法实现顺电相。值得注意的是，在应力场下， AgNbO ₃晶格中长程库仑力、短程原子间相互作用和共价相互作用的竞争得到了体现。_{目前的工作可以为揭示AgNbO 3}的高压相变提供基本指导，这将为设计具有极端功能特性的器件开辟可能性。