Harsha Chouhan, Sushil Kumar Behera, Maheswar Panda
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引用次数: 0
摘要
通过不同的聚合物如聚乙烯醇、聚乙烯基吡罗烷酮和聚乙二醇的介质热合成ZnFe2O4，以防止不希望的团聚。XRD光谱的Rietveld细化证实了样品为fcc，而FESEM/TEM显微图显示了球形纳米颗粒的形成。TGA/DSC分析证实样品在500°C下是稳定的。介电、阻抗和模量光谱作为温度高达200°C和频率范围为20 Hz至2 MHz的函数，证实了样品中存在的晶界/MWS极化在不同温度下的单一非debye型弛豫行为（由KWW （Kohlrausch-Williams-Watts）函数很好地拟合）。模量和阻抗主曲线证实了弛豫时间的分布与温度无关。用CBH（相关势垒跳跃）模型解释了交流电导率现象，该模型满足Jonscher的通用幂律，其指数在[0,1]范围内，活化能在0.4-0.8 eV范围内。利用紫外可见/PL光谱对样品进行了光谱分析，结果表明该铁氧体的直接能带隙在1.7 eV ~ 2.8 eV之间，适合于高频光电子应用。
Impedance and modulus spectroscopy of thermally synthesised ZnFe2O4 prepared through the mediation of different polymers
ZnFe2O4 was thermally synthesised through the mediation of different polymers such as Poly(vinyl alcohol), Poly(vinyl pyrrolidone) and Poly(ethylene glycol) to prevent the unwanted agglomeration. The Rietveld refinement of the XRD spectra confirmed the sample to be fcc, while the FESEM/TEM micrographs exhibited the formation of spherical nanoparticles. The TGA/DSC analysis confirmed that the sample is stable up to 500°C. The dielectric, impedance and modulus spectroscopy as a function of temperature up to 200°C and within the frequency range of 20 Hz to 2 MHz confirm a single non-Debye type relaxation behaviour at different temperatures (well fitted by the KWW (Kohlrausch–Williams–Watts) function) attributed to the grain boundary/MWS polarisation present in the samples. The modulus and impedance master curve confirmed the distribution of relaxation times being independent of temperature. The AC conductivity phenomenon is explained using the CBH (correlated barrier hopping) model, satisfying Jonscher's universal power law with exponents in the range of [0,1] with an activation energy in the range of 0.4–0.8 eV. The obtained optical spectra of the samples with the help of UV-visible/PL spectra evaluate the direct energy band gap to be from 1.7 eV to 2.8 eV and these ferrites may be suitable for high-frequency as well as for optoelectronic applications.
期刊介绍：
The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.
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