J.R.D. Ruiz López , Subhash Sharma , Francisco Brown , V.E. Alvarez-Montano , Jesús M. Siqueiros , Oscar Raymond Herrera
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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. 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 <em>ε</em><sub><em>r</em></sub> = 82 and <em>tanδ</em> = 0.88 for x = 0.0 to <em>ε</em><sub>r</sub> = 116 and <em>tanδ</em> = 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 P<sub>r</sub> was found to be 0.24 μC/cm<sup>2</sup>, 0.28 μC/cm<sup>2</sup>, and 0.84 μC/cm<sup>2</sup> for x = 0.05, 0.10, and 0.15, respectively.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"328 ","pages":"Article 130033"},"PeriodicalIF":4.3000,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"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\",\"authors\":\"J.R.D. Ruiz López , Subhash Sharma , Francisco Brown , V.E. Alvarez-Montano , Jesús M. Siqueiros , Oscar Raymond Herrera\",\"doi\":\"10.1016/j.matchemphys.2024.130033\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>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)Bi<sub>0.85</sub>La<sub>0.15</sub>FeO₃-(x)Ca<sub>0.5</sub>Sr<sub>0.5</sub>TiO<sub>3</sub> 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 <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. 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 <em>ε</em><sub><em>r</em></sub> = 82 and <em>tanδ</em> = 0.88 for x = 0.0 to <em>ε</em><sub>r</sub> = 116 and <em>tanδ</em> = 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 P<sub>r</sub> was found to be 0.24 μC/cm<sup>2</sup>, 0.28 μC/cm<sup>2</sup>, and 0.84 μC/cm<sup>2</sup> for x = 0.05, 0.10, and 0.15, respectively.</div></div>\",\"PeriodicalId\":18227,\"journal\":{\"name\":\"Materials Chemistry and Physics\",\"volume\":\"328 \",\"pages\":\"Article 130033\"},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2024-10-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Materials Chemistry and Physics\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0254058424011611\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Chemistry and Physics","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0254058424011611","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
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。
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.
期刊介绍:
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