固态路线制备的 (1-x) Bi0.85La0.15FeO3 - (x) Ca0.5Sr0.5TiO3 陶瓷从斜方相到单斜相的结构相变及物理性质

IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
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Rietveld analysis of X-ray diffraction data of all samples revealed the formation of a single-phase solid solution with a distorted rhombohedral perovskite structure for x = 0.00 and 0.05, characterized by <em>R</em>3<em>c</em> symmetry, a mix of rhombohedral (<em>R</em>3<em>c</em>) and monoclinic (<em>Cc</em>) phases for x = 0.10 (<em>R</em>3<em>c</em> 31 % and <em>Cc</em> 69 %), whereas for x = 0.15 a single-phase solid solution with <em>Cc</em> symmetry was found. UV–visible analysis demonstrated that the optical band gap was increased from 2.11 eV for x = 0.0 to 2.21 eV for x = 0.15 in the visible range, and can be used in photovoltaics applications. 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引用次数: 0

摘要

本研究采用固态反应法合成了一系列 x = 0.0、0.05、0.10 和 0.15 的 (1-x)Bi0.85La0.15FeO₃-(x)Ca0.5Sr0.5TiO3 或 ((1-x)BLFO-(x)CSTO) 系陶瓷固溶体。为了研究 BFO 中掺杂 CSTO 的影响,对其结构、光学、介电和铁电特性进行了详细研究。对所有样品的 X 射线衍射数据进行的里特维尔德分析表明,在 x = 0.00 和 0.05 时,形成了以 R3c 对称性为特征的单相固溶体,在 x = 0.10 时,形成了斜方晶相(R3c)和单斜晶相(Cc)的混合体(R3c 31 % 和 Cc 69 %),而在 x = 0.15 时,则形成了以 Cc 对称性为特征的单相固溶体。紫外-可见光分析表明,在可见光范围内,光带隙从 x = 0.0 时的 2.11 eV 增加到 x = 0.15 时的 2.21 eV,可用于光伏应用。测量了室温介电性能,发现 CSTO 在改变 BLFO 陶瓷的介电性能方面起着关键作用;10 kHz 时的介电常数和介电损耗从 x = 0.0 时的εr = 82 和 tanδ = 0.88 变为 x = 0.15 时的εr = 116 和 tanδ = 1.08。由于氧和硼空位的抑制,当 CSTO 百分比从 x = 0.0 增加到 0.15 时,漏电流密度降低,这一事实进一步反映在掺杂 CSTO 的 BFO 陶瓷的铁电特性中。室温铁电特性随着 CSTO 掺杂的增加而提高,在 x = 0.05、0.10 和 0.15 时,Pr 分别为 0.24 μC/cm2、0.28 μC/cm2 和 0.84 μC/cm2。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Structural phase transition from rhombohedral to monoclinic phase and physical properties of (1-x) Bi0.85La0.15FeO3 – (x) Ca0.5Sr0.5TiO3 ceramics prepared by the solid-state route

Structural phase transition from rhombohedral to monoclinic phase and physical properties of (1-x) Bi0.85La0.15FeO3 – (x) Ca0.5Sr0.5TiO3 ceramics prepared by the solid-state route
In the present work, a series of solid solutions were synthesized using the solid-state reaction method for x = 0.0, 0.05, 0.10, and 0.15 in system (1-x)Bi0.85La0.15FeO₃-(x)Ca0.5Sr0.5TiO3 or ((1-x)BLFO-(x)CSTO) ceramics. Structural, optical, dielectric, and ferroelectric properties were studied in detail to investigate the impact of CSTO doping in BFO. Rietveld analysis of X-ray diffraction data of all samples revealed the formation of a single-phase solid solution with a distorted rhombohedral perovskite structure for x = 0.00 and 0.05, characterized by R3c symmetry, a mix of rhombohedral (R3c) and monoclinic (Cc) phases for x = 0.10 (R3c 31 % and Cc 69 %), whereas for x = 0.15 a single-phase solid solution with Cc symmetry was found. UV–visible analysis demonstrated that the optical band gap was increased from 2.11 eV for x = 0.0 to 2.21 eV for x = 0.15 in the visible range, and can be used in photovoltaics applications. The room temperature dielectric properties were measured, and a crucial role of CSTO was revealed in modifying the dielectric properties of BLFO ceramics; the dielectric constant and dielectric loss at 10 kHz change from εr = 82 and tanδ = 0.88 for x = 0.0 to εr = 116 and tanδ = 1.08 for x = 0.15. The leakage current density decreases while increasing the CSTO % from x = 0.0 to 0.15 due to the suppression of oxygen and Bi vacancies, a fact that is further reflected in the ferroelectric properties of CSTO-doped BFO ceramics. Room temperature ferroelectric properties improved with CSTO doping, and Pr was found to be 0.24 μC/cm2, 0.28 μC/cm2, and 0.84 μC/cm2 for x = 0.05, 0.10, and 0.15, respectively.
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来源期刊
Materials Chemistry and Physics
Materials Chemistry and Physics 工程技术-材料科学:综合
CiteScore
8.70
自引率
4.30%
发文量
1515
审稿时长
69 days
期刊介绍: Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.
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