铈掺杂对钴铁氧体纳米粒子Mössbauer光谱参数的影响

G. Chandra, R. Srivastava
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摘要

本文研究了铈掺杂钴铁氧体纳米粒子的结构特性和穆斯堡尔参数。样品的制备采用溶胶-凝胶法制备,样品在300℃下烧结1小时。XRD谱图表明,在纯铁酸钴和掺杂铁酸钴样品中均存在纯铁酸钴相。掺铈样品的XRD谱图比纯样品更加分散,表明少量掺铈时结晶减弱。掺杂后样品的粒径减小(纯样品为12nm,掺杂样品为8nm),穆斯堡尔光谱中出现大重偶态也证实了这种减小。在纯样品和掺铈样品中,穆斯堡尔光谱显示出两组六重体和一组双重体。两个六重体表示样品的铁磁性质,双重体归因于样品中超顺磁粒子的存在。利用穆斯堡尔参数计算了两种样品的结构公式,发现A和B位点之间的阳离子分布有很大的影响。本研究还计算了公式单位磁矩,纯样品和掺杂样品的磁矩分别为4.314µB和4.596µB。本文研究了铈掺杂钴铁氧体纳米粒子的结构特性和穆斯堡尔参数。样品的制备采用溶胶-凝胶法制备,样品在300℃下烧结1小时。XRD谱图表明,在纯铁酸钴和掺杂铁酸钴样品中均存在纯铁酸钴相。掺铈样品的XRD谱图比纯样品更加分散,表明少量掺铈时结晶减弱。掺杂后样品的粒径减小(纯样品为12nm,掺杂样品为8nm),穆斯堡尔光谱中出现大重偶态也证实了这种减小。在纯样品和掺铈样品中,穆斯堡尔光谱显示出两组六重体和一组双重体。两个六重体表示样品的铁磁性质,双重体归因于样品中超顺磁粒子的存在。用穆斯堡尔参数计算了结构公式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of cerium doping on the Mössbauer spectroscopic parameters of cobalt ferrite nanoparticles
In this investigation the structural properties and Mossbauer parameters of Ce doped cobalt ferrite nanoparticles are presented. The preparation of the sample is done by nitrate route using sol-gel method and samples are sintered at 300°C for one hour. The XRD pattern shows the pure phases of ferrite in both pure and doped sample of cobalt ferrite. The XRD pattern of cerium doped sample is more scattered then pure sample which indicates that crystallization is weakening when a small amount of cerium is doped. After doping a decrease in particle size is (12nm for pure and 8nm for doped sample) found, this decrease is also verified by the presence of large doublet in Mossbauer spectra. The Mossbauer spectra show two sets of sextets and one doublet in pure as well as in cerium doped sample. Two sextets signify the ferrimagnetic nature of the sample and the doublet is attributed to the presence of superparamagnetic particles in the specimen. A structural formula is calculated by using Mossbauer parameters for both the samples and a substantial effect is found in cationic distribution between A and B sites. Magnetic moment per formula unit is also calculated in this study the values are found for pure and doped samples 4.314 µB and 4.596 µB respectively.In this investigation the structural properties and Mossbauer parameters of Ce doped cobalt ferrite nanoparticles are presented. The preparation of the sample is done by nitrate route using sol-gel method and samples are sintered at 300°C for one hour. The XRD pattern shows the pure phases of ferrite in both pure and doped sample of cobalt ferrite. The XRD pattern of cerium doped sample is more scattered then pure sample which indicates that crystallization is weakening when a small amount of cerium is doped. After doping a decrease in particle size is (12nm for pure and 8nm for doped sample) found, this decrease is also verified by the presence of large doublet in Mossbauer spectra. The Mossbauer spectra show two sets of sextets and one doublet in pure as well as in cerium doped sample. Two sextets signify the ferrimagnetic nature of the sample and the doublet is attributed to the presence of superparamagnetic particles in the specimen. A structural formula is calculated by using Mossbauer parameters for...
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