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Effect of Magnetic Ion, Fe3+ on the Structural and Dielectric Properties of Oxychloro Bismuth Borate Glasses
Solid State Sciences ( IF 3.5 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.solidstatesciences.2020.106491
Meena Malik , Sunita Dagar , Ashima Hooda , Ashish Agarwal , Satish Khasa

Abstract The glasses with composition xFe2O3 (55-x) B2O3 10Bi2O3 25BaO 10LiCl where x = 0.0, 5.0, 7.0, 10.0, 12.0 and 15.0) are produced via melt quenching technique. X-ray diffraction (XRD), Energy dispersive spectrum (EDS), Electron paramagnetic resonance (EPR) spectra, dielectric measurements, ac conductivity, equivalent circuit analysis, modulus analysis, dc conductivity, UV-VIS-IR spectra (using Diffused Reflectance Spectroscopy, DRS), differential thermal analysis (DTA) and Mossbauer spectra have been investigated for the synthesized glass system. The amorphous nature of as prepared glasses has been confirmed by XRD profiles. EPR spectra confirms presence of Fe3+ ions in distorted octahedral coordination and supported by UV–Vis absorption bands. The hyperfine parameters from the Mossbauer spectrum indicates that iron mainly exists as Fe3+ ions and in octahedral coordination. Dielectric constants e′, e″ and tanδ were found to show similar behavior and decrease with increasing frequencies. The presence of relaxation phenomena was revealed from the transition in Tangent Loss (tanδ) for compositions x = 12 and x = 15. Modulus analysis and impedance spectroscopy exhibited non-Debye type relaxation phenomena and the shifting of peaks of M″ towards higher frequency with increase in temperature. Nyquist's plot was fitted using Electrochemical Impedance Spectroscopy (EIS) software and equivalent circuit was found to hold a series combination of a capacitor with a constant phase element and a resistor connected in parallel confirmed the grain boundary effects only. Variation in ac conductivity with frequency for all samples follow Jonscher's power law and frequency exponent parameter “s” is used to analyze conduction mechanism by different conductivity models. Variation of dc conductivity with temperature confirms semiconducting behavior of prepared glasses and no deviation in linearity of Arrhenius plot depict ionic conduction mechanism principally. Optical band gap obtained from DRS is found to be in range 2.05–3.42 eV and decreases with increase in iron content.

中文翻译:

磁离子、Fe3+对氧氯硼酸铋玻璃结构和介电性能的影响

摘要 组成为 xFe2O3 (55-x) B2O3 10Bi2O3 25BaO 10LiCl 其中 x = 0.0、5.0、7.0、10.0、12.0 和 15.0) 的玻璃是通过熔融淬火技术生产的。X 射线衍射 (XRD)、能量色散谱 (EDS)、电子顺磁共振 (EPR) 谱、介电测量、交流电导率、等效电路分析、模量分析、直流电导率、UV-VIS-IR 光谱(使用漫反射光谱) , DRS)、差热分析 (DTA) 和穆斯堡尔谱已对合成的玻璃系统进行了研究。所制备玻璃的无定形性质已通过 XRD 谱证实。EPR 光谱证实了在扭曲的八面体配位中存在 Fe3+ 离子,并由 UV-Vis 吸收带支持。穆斯堡尔谱的超精细参数表明铁主要以 Fe3+ 离子和八面体配位形式存在。发现介电常数 e'、e" 和 tanδ 表现出类似的行为并随着频率的增加而降低。从组合物 x = 12 和 x = 15 的切线损耗 (tanδ) 的转变揭示了弛豫现象的存在。模量分析和阻抗谱表现出非德拜型弛豫现象,并且 M" 的峰向更高频率移动温度升高。使用电化学阻抗谱 (EIS) 软件拟合奈奎斯特图,发现等效电路包含具有恒定相位元件的电容器和并联连接的电阻器的串联组合,仅证实了晶界效应。所有样品的交流电导率随频率的变化遵循 Jonscher 幂律,频率指数参数“s”用于分析不同电导率模型的传导机制。直流电导率随温度的变化证实了制备的玻璃的半导体行为,阿伦尼乌斯图的线性没有偏差主要描述了离子传导机制。发现从 DRS 获得的光学带隙在 2.05-3.42 eV 范围内,并且随着铁含量的增加而减小。直流电导率随温度的变化证实了制备的玻璃的半导体行为,阿伦尼乌斯图的线性没有偏差主要描述了离子传导机制。发现从 DRS 获得的光学带隙在 2.05-3.42 eV 范围内,并且随着铁含量的增加而减小。直流电导率随温度的变化证实了制备的玻璃的半导体行为,并且阿伦尼乌斯图的线性没有偏差,主要描述了离子传导机制。发现从 DRS 获得的光学带隙在 2.05-3.42 eV 范围内,并且随着铁含量的增加而减小。
更新日期:2020-12-01
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