Flávia Regina Estrada, Ariel Moreno-Gobbi, Dragan Damjanovic, Ducinei Garcia
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引用次数: 0
摘要
基于 PbTiO3 的铁电固溶陶瓷已被广泛用于机电设备。然而,分离和控制对机电功能的贡献仍具有挑战性,主要是温度的函数,在温度下可以观察到热异常和相变。本研究以 PbTiO3 中的 A 位等价置换为例,研究了 Pb0.55Ca0.45TiO3 陶瓷从低温(10 或 115 K)到室温的超声波速度和衰减以及介电、铁电和结构特征。这些信息的结合使得铁电畴壁针销和结构特征对自发电极化效应的现象学解构成为可能。室温对称性被确定为 Pna21。结果表明,利用同步辐射 X 射线衍射图样从 115 K 到室温的里特维尔德法提炼出的这一模型可以解释这些材料在加热过程中的极化扩展特征。这项研究表明了基于 PbTiO3 的铁电陶瓷中结构热异常与低温电极化之间的相关性。
Polar orientation and extension in a novel crystallographic model for PbTiO3-based perovskites explaining the experimental ferroelectric thermal anomalies
PbTiO3-based ferroelectric solid-solution ceramics have been widely used for electromechanical devices. However, it is still challenging to separate and control the contributions to the electromechanical functionalities, mainly as a function of temperature, where thermal anomalies and phase transitions can be observed. This study investigates the ultrasonic velocity and attenuation and the dielectric, ferroelectric and structural features of Pb0.55Ca0.45TiO3 ceramics from low temperatures (10 or 115 K) up to room temperature as an example of A-site isovalent substitution in PbTiO3. Such a combination of information makes possible the phenomenological deconvolution of the effects of ferroelectric domain wall pinning and structural features on spontaneous electric polarization. The room-temperature symmetry was determined as Pna21. The results show that this model refined by the Rietveld method for synchrotron X-ray diffraction patterns from 115 K to room temperature can explain the polarization extension features of these materials during heating. This study shows a correlation between structural thermal anomalies and low-temperature electric polarization in PbTiO3-based ferroelectric ceramics.
期刊介绍:
Many research topics in condensed matter research, materials science and the life sciences make use of crystallographic methods to study crystalline and non-crystalline matter with neutrons, X-rays and electrons. Articles published in the Journal of Applied Crystallography focus on these methods and their use in identifying structural and diffusion-controlled phase transformations, structure-property relationships, structural changes of defects, interfaces and surfaces, etc. Developments of instrumentation and crystallographic apparatus, theory and interpretation, numerical analysis and other related subjects are also covered. The journal is the primary place where crystallographic computer program information is published.