In situ X-ray diffraction evidence of field-induced transitions in a PbHfO3 single crystal

被引：0

作者：

Arkhipov, Nickolay ^{[1
]}

Ganzha, Alexander ^{[1
]}

Kniazeva, Maria ^{[1
]}

Vakulenko, Alexander ^{[1
]}

Filimonov, Alexey ^{[1
]}

Burkovsky, Roman ^{[1
]}

机构：

[1] Peter the Great Saint-Petersburg Polytechnic University, 29 Politekhnicheskaya, St. Peterburg,195251, Russia

来源：

Journal of Applied Crystallography | 2024年 / 57卷 / Pt 4期

关键词：

Antiferroelectric (AFE) materials are interesting due to recent discoveries of new prospective applications; although the mechanisms of the phase transitions that are at the heart of these applications remain incompletely understood. This work is devoted to the study of a single crystal of a model AFE; lead hafnate; by X-ray diffraction with in situ application of an electric field to trigger the transition to a polar phase. Two consecutive experiments were carried out on a 35μm thick plate with [110] surface normal orientation over a field range from 0 to 330kVcm-1 and back. A sharp drop in the intensity of R- and Σ-type reflections around 225kVcm-1 was registered; with almost complete disappearance after 250kVcm-1. This is compatible with a field-induced phase transition from the AFE to the R3m polar phase; which was suggested earlier on the basis of non-diffraction characterizations. X-ray diffraction reveals that the AFE domains with displacements parallel to the field direction react much more smoothly to the field; gradually reducing the AFE order at very small fields instead of holding it almost constant up to the critical field value; which is naturally expected. This expectation is fulfilled for domains with other orientations; but only for the first switching cycle; in the second switching cycle the AFE order already shows a notable decrease at subcritical fields. It is suggested that these observations could be linked with the antiphase domain wall population being affected by the field; which is consistent with the observation of diffuse rods between the Γ and Σ points. Another remarkable observation is the much smoother recovery of the AFE phase compared with its sharp disappearance at the critical field. © 2024 International Union of Crystallography. All rights reserved;

D O I：

10.1107/S1600576724006393

中图分类号：

学科分类号：

摘要：

引用

页码：1184 / 1191

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