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首页> 外文期刊>Physica, B. Condensed Matter >Effect of particle size on degree of inversion in ferrites investigated by M?ssbauer spectroscopy
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Effect of particle size on degree of inversion in ferrites investigated by M?ssbauer spectroscopy

机译：Msssbauer光谱法研究粒径对铁素体反转度的影响

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M?ssbauer spectroscopy has been employed to investigate the cation distribution and degree of inversion in bulk and nanosized particles of CuFe_2O_4, MnFe_2O_4 and NiFe _2O_4 ferrites. The M?ssbauer spectra of all bulk ferrites show the complete magnetic behaviour, whereas nanoparticle ferrites are combination of ferromagnetic and superparamagnetic components. Moreover, the cation distribution in nanoparticle materials is also found to be different to that of their bulk counterparts indicating the particle size dependency. The inversion of Cu and Ni ions in bulk sample is greater than that of nanoparticles, whereas the inversion of Mn ions is less in bulk material as compared to the nanoparticles. Hence the degree of inversion (λ) decreases in CuFe_2O_4 and NiFe_2O_4 samples, whereas it increases in MnFe_2O_4 as the particle size decreases and thus shows the anomalous behaviour in this case. The nanoparticle samples also show paramagnetic behaviour due to superparamagnetism and this effect is more prominent in MnFe_2O_4.
机译：M？ssbauer光谱已被用于研究CuFe_2O_4，MnFe_2O_4和NiFe_2O_4铁氧体的块状和纳米级颗粒中阳离子的分布和反型程度。所有块状铁素体的Msssbauer光谱显示出完全的磁性行为，而纳米粒子铁素体则是铁磁性和超顺磁性成分的组合。此外，还发现纳米颗粒材料中的阳离子分布与其本体对应物的阳离子分布不同，这表明了颗粒尺寸依赖性。与纳米颗粒相比，块状样品中的铜离子和镍离子的转化率比纳米颗粒大，而锰离子在块状材料中的转化率则较小。因此，在CuFe_2O_4和NiFe_2O_4样品中，反转度（λ）降低，而在MnFe_2O_4样品中，其反转度随着粒径的减小而增加，因此在这种情况下表现出反常行为。纳米颗粒样品还由于超顺磁性而表现出顺磁性行为，并且该效应在MnFe_2O_4中更显着。

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