Investigation of local structure and phase transformation in Ce-doped barium titanate and correlation with electrical properties

IF 1.3 4区材料科学 Q3 CRYSTALLOGRAPHY Phase Transitions Pub Date : 2023-06-03 DOI:10.1080/01411594.2023.2218004

Md Sahanoor Islam, J. Ghosh

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Abstract

ABSTRACT BaTiO3-based materials are used as the replacement for lead-based perovskite materials for its wide dielectric applications. But the substitution of different doping elements in pure BaTiO3 drastically affects the microstructure, phase transition behavior and electrical properties. In the present work, local structure, phase transformation and dielectric behavior of BaCexTi1-xO3 (BCT) ceramics were studied for compositions x = 0.02, 0.05 and 0.1. A diffuse phase transition from orthorhombic to cubic via tetragonal in BCT with increasing Ce content was observed. An increase in particle size with Ce doping concentration was observed in FESEM images. Spherical and cuboid-shaped particle in the order of 80–150 nm was observed in transmission electron microscopic (TEM) images. RAMAN spectra confirm the tetragonal to cubic phase transition. Local structural and phase transformation behavior was obtained from laboratory-based PDF and XRD, respectively. Change in PDF was observed due to an increase in Ce doping. Dielectric properties decreased for Ce mole fraction of x = 0.1.

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Ce掺杂钛酸钡的局域结构和相变及其与电学性能的相关性研究

batio3基材料因其广泛的介电应用而被用作铅基钙钛矿材料的替代品。但不同掺杂元素的取代对纯BaTiO3的微观结构、相变行为和电学性能有显著影响。在本工作中，研究了成分x = 0.02、0.05和0.1时BaCexTi1-xO3 (BCT)陶瓷的局部结构、相变和介电行为。随着Ce含量的增加，BCT中出现了由正交晶向立方晶经四方晶的扩散相变。在FESEM图像中观察到，随着Ce掺杂浓度的增加，颗粒尺寸增大。透射电子显微镜(TEM)观察到80 ~ 150 nm量级的球形和长方体颗粒。拉曼光谱证实了四方向立方相变。通过室内PDF和XRD分别获得了材料的局部结构和相变行为。由于Ce掺杂的增加，观察到PDF的变化。当Ce摩尔分数x = 0.1时，介电性能下降。

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来源期刊

Phase Transitions 物理-晶体学

CiteScore

3.00

自引率

6.20%

发文量

审稿时长

1.4 months

期刊介绍： Phase Transitions is the only journal devoted exclusively to this important subject. It provides a focus for papers on most aspects of phase transitions in condensed matter. Although emphasis is placed primarily on experimental work, theoretical papers are welcome if they have some bearing on experimental results. The areas of interest include: -structural phase transitions (ferroelectric, ferroelastic, multiferroic, order-disorder, Jahn-Teller, etc.) under a range of external parameters (temperature, pressure, strain, electric/magnetic fields, etc.) -geophysical phase transitions -metal-insulator phase transitions -superconducting and superfluid transitions -magnetic phase transitions -critical phenomena and physical properties at phase transitions -liquid crystals -technological applications of phase transitions -quantum phase transitions Phase Transitions publishes both research papers and invited articles devoted to special topics. Major review papers are particularly welcome. A further emphasis of the journal is the publication of a selected number of small workshops, which are at the forefront of their field.