反铁电体 PbZrO3 中作为初始亚铁电畴的平移边界
Translational boundaries as incipient ferrielectric domains in antiferroelectric PbZrO3
AI总结：
该研究利用像差校正 STEM 在 PbZrO3 单晶中发现平移边界对应“上—下—上”亚铁电相，并聚集形成嵌入反铁电基体的极性条纹畴。
摘要：
在典型反铁电体 PbZrO3 中，反平行电偶极子相互抵消，导致宏观层面的自发极化为零。然而在实际的磁滞回线中，这种抵消很少是完美的，通常会观察到一些剩余极化，表明该材料中极性相具有亚稳态。在本工作中，我们利用像差校正扫描透射电子显微镜方法对 PbZrO3 单晶进行研究，揭示了常见反铁电相与具有“上—下—上”电偶极子模式的亚铁电相的共存。这种偶极子排列曾由 Aramberri 等人（2021）预测为 PbZrO3 在 0 K 下的基态，它在室温下以平移边界的形式出现，并聚集形成嵌入反铁电基体中的更宽的极性相条纹畴。
英文摘要：
In the archetypal antiferroelectric PbZrO3, antiparallel electric dipoles cancel each other, resulting in zero spontaneous polarisation at the macroscopic level. Yet in actual hysteresis loops, the cancellation is rarely perfect and some remnant polarization is often observed, suggesting the metastability of polar phases in this material. In this work, using aberration-corrected scanning transmission electron microscopy methods on a PbZrO3 single crystal, we uncover the coexistence of the common antiferroelectric phase and a ferrielectric phase featuring an electric dipole pattern of "up down up". This dipole arrangement, predicted by Aramberri et al. (2021) to be the ground state of PbZrO3 at 0K, appears at room temperature in the form of translational boundaries that aggregate to form wider stripe domains of the polar phase embedded within the antiferroelectric matrix.
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