二磷酸钇铷的合成、形貌研究及导电机理

IF 2.1 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS
Souad Chkoundali, Hanen Ghoudi, Samia Aydi, Abderrazek Oueslati, Abdelhedi Aydi
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引用次数: 0

摘要

采用固体法合成了二磷酸铷钇化合物。用x射线粉末衍射、形貌、拉曼光谱和复阻抗谱测定了该化合物的特征。x射线粉末衍射显示RbYP2O7化合物在单斜晶系(P21/c空间群)中结晶,SEM图显示颗粒具有不同大小的正方形,样品的平均晶粒尺寸为1.75 μm。复阻抗谱分析表明,化合物的电特性与温度和频率有很大关系。在复阻抗谱的奈奎斯特图中可以检测到两个半圆,表明晶粒和晶界的影响。温度相关阻抗谱分析表明了非debye型弛豫机制与负温度电阻系数(NTCR)行为耦合。此外,交流电导率频率依赖于Jonscher定律,而直流电导率促进了RbYP2O7成分的极化子辅助跳变,晶粒的活化能σg和晶界分别为Eag= 0.81 eV和Eagb = 1.21 eV。幂律指数(s)表明,相关垒跳(CBH)模型对应于该材料的主导输运过程。此外,在研究的材料结构中,以混合Rb+阳离子运动为主的模谱揭示了多重弛豫过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synthesis, morphology investigation and electrical conduction mechanism of rubidium yttrium diphosphate

The rubidium yttrium diphosphate compoundwas synthesized by solid route. The characteristics of this compound have been determined using X-ray powder diffraction, morphological, Raman and complex impedance spectroscopy. While X-ray powder diffraction revealed that RbYP2O7 compound crystallizes in the monoclinic system (P21/c space group), the SEM mapping demonstrated that the particles have the shape of squares of different sizes and demonstrate that the mean crystalline size of the specimen is 1.75 μm. The complex impedance spectra analysis indicated that the electrical features of the compound are largely dependent on temperature and frequency. Two semi circles are detectable in the Nyquist plots of the complex impedance spectra, suggesting the contribution of the effects of the grain and grain boundary. Non-Debye type relaxation mechanism coupled with negative temperature coefficient of resistance (NTCR) behaviour was indicated by temperature dependent impedance spectroscopy. Additionally, the AC conductivity frequency dependence was interpreted in terms of Jonscher’s law, whereas DC conductivity promotes the polaron assisted hopping in RbYP2O7 composition having activation energies of the grain σg and grain boundary are Eag= 0.81 eV and Eagb = 1.21 eV, respectively. The power law exponent (s) yielded that the correlated barrier hopping (CBH) model corresponds to the dominant transport process in this material. Furthermore, the multiple relaxation process was revealed by the modulus spectroscopy dominated by the mixed Rb+ cation motion within the investigated material structure.

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来源期刊
Journal of the Australian Ceramic Society
Journal of the Australian Ceramic Society Materials Science-Materials Chemistry
CiteScore
3.70
自引率
5.30%
发文量
123
期刊介绍: Publishes high quality research and technical papers in all areas of ceramic and related materials Spans the broad and growing fields of ceramic technology, material science and bioceramics Chronicles new advances in ceramic materials, manufacturing processes and applications Journal of the Australian Ceramic Society since 1965 Professional language editing service is available through our affiliates Nature Research Editing Service and American Journal Experts at the author''s cost and does not guarantee that the manuscript will be reviewed or accepted
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