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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Highly enhanced dielectric permittivity in CoFe2O4 by the Gd substitution in the octahedral sites
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Highly enhanced dielectric permittivity in CoFe2O4 by the Gd substitution in the octahedral sites

机译：通过八面体位点的GD替代在COFE2O4中高度增强的介电常数

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摘要

Polycrystalline CoFe2-xGdxO4 (x = 0.0, 0.02, 0.04, 0.06, 0.08 and 0.1) were prepared by modified combustion technique intending to tune the dielectric properties of CoFe2O4 by the Gd substitution of Fe atoms in the octahedral sites. Enhancement of dielectric permittivity is observed with the increasing concentration of Gd in CoFe2O4. At higher levels of Gd substitution, CoFe2O4 shows ten times more dielectric permittivity than the pristine one. This enhancement of dielectric permittivity is mainly due to the increase of exchange interaction between Fe2+ and Fe3+ ions through induced strain, excess availability of Fe2+ ions in the lattice and grain - grain boundary contribution. Incorporation of larger ions in Fe sites induces a strain in the lattice due to the lattice mismatch in system. W-H plot is employed to study this induced strain in detail. Reitveld refinement technique explains the excess increase of Fe2+ ions. The excess increase of Fe2+ in CoFe2-xGdxO4 is further confirmed by XPS analysis. The role of grain-grain boundary influence on the dielectric permittivity is evident from Nyquist plots. Temperature and frequency-dependent dielectric spectroscopic studies were conducted in detail. All these results point to the fact that substitution with Gd ions in Fe sites tailors the dielectric properties of CoFe2O4, which helps to develop more advanced technologies in future. (C) 2020 Elsevier B.V. All rights reserved.
机译：采用改进的燃烧技术制备了多晶CoFe2-xGdxO4（x=0.0,0.02,0.04,0.06,0.08和0.1），旨在通过八面体位置的Fe原子的Gd取代来调节CoFe2O4的介电性能。随着Gd在CoFe2O4中浓度的增加，介电常数增加。在较高的Gd取代水平下，CoFe2O4的介电常数是原始材料的十倍。介电常数的提高主要是由于Fe2+和Fe3+离子之间的交换作用通过诱导应变、晶格中Fe2+离子的过量利用率和晶界贡献而增加。由于系统中的晶格失配，在Fe位中加入较大的离子会在晶格中引起应变。采用W-H图对该诱发应变进行了详细研究。Reitveld细化技术解释了Fe2+离子的过度增加。XPS分析进一步证实了CoFe2-xGdxO4中Fe2+的过量增加。从奈奎斯特图可以看出，晶界对介电常数的影响是明显的。详细地进行了温度和频率相关的介电光谱研究。所有这些结果都表明，在Fe位用Gd离子取代可以调整CoFe2O4的介电性能，这有助于未来开发更先进的技术。（C） 2020爱思唯尔B.V.版权所有。

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