Dielectric behavior of nano-structured and bulk Li Ni Zn ferrite samples
The ac conductivity and dielectric properties of spinel ferrite nanoparticles of Li0.1(Ni1−xZnx)0.8Fe2.1O4 (x=0.0–1.0) prepared by the chemical co-precipitation method were investigated as functions of frequency and temperature by using a complex impedance technique. Parts of the precipitated powder...
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Published in | Journal of magnetism and magnetic materials Vol. 324; no. 19; pp. 2989 - 3001 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.09.2012
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | The ac conductivity and dielectric properties of spinel ferrite nanoparticles of Li0.1(Ni1−xZnx)0.8Fe2.1O4 (x=0.0–1.0) prepared by the chemical co-precipitation method were investigated as functions of frequency and temperature by using a complex impedance technique. Parts of the precipitated powders were pressed into a disk-shape and were sintered at 1473K for 2h to increase the particle size to the bulk scale (dimensions >100nm). The ac conductivity of the samples increases with increasing temperature, ensuring the semiconducting behavior of both nano and bulk samples, in agreement with the Koops model to describe heterogeneous structures. The significant decrease in ac conductivity σ′ac, dielectric constant, and dielectric loss of the as-prepared nanosamples compared to their bulk counterparts is correlated to the small size of the grain compared to the grain boundary size. This might be useful for many applications requiring the reduction of eddy current effects.
► Nanosamples of Li0.1(Ni1−xZnx)0.8Fe2.1O4 and their bulk counterparts have been prepared. ► Investigated properties are ac conductivity, dielectric constant and loss tangent. ► An essential decrease in σac in all samples except Ni Zn ferrite is due to incorporation of Li. ► Further decreases in σac and ε′ of nanosamples than the bulk ones are due to the nanosize. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0304-8853 |
DOI: | 10.1016/j.jmmm.2012.04.037 |