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The Influence of Stoichiometry on the Index of Refraction of Cobalt Ferrite Samples at Terahertz Frequencies

Published online by Cambridge University Press:  16 May 2017

Alan F. N. Boss ,
Antonio C. C. Migliano  and
Ingrid Wilke
Alan F. N. Boss*
Affiliation:
Instituto Tecnológico de Aeronáutica, São José dos Campos, SP, 12228-900 Brazil
Antonio C. C. Migliano
Affiliation:
Instituto Tecnológico de Aeronáutica, São José dos Campos, SP, 12228-900 Brazil Instituto de Estudos Avançados, São José dos Campos, SP, 12228-001 Brazil
Ingrid Wilke
Affiliation:
Rensselear Polytechnic Institute, Troy, NY, 12180 USA
*
*(Email: [email protected])
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Abstract

We report an experimental study on the terahertz frequency dielectric properties of manganese cobalt ferrites (MnxCo1−xFe2O4) and nickel cobalt ferrites (NixCo1-xFe2O4) with three different stoichiometry each, x=0.3, x=0.5 and 0.7. Particularly, we present a comparison and discussion of the terahertz frequency indices of refraction of these two ferrites compositions. MnxCo1−xFe2O4 and NixCo1-xFe2O4 pellets with different Mn/Co and Ni/Co ratios (x=0.3, x=0.5 and x=0.7) were prepared by state-of-the-art ceramic processing. The morphology and chemical homogeneity of these ferrites were characterized by energy dispersive x-ray spectroscopy. We observed that the indexes of refraction for manganese cobalt ferrites are 3.22, 3.71 and 3.67 for ratios of 0.3, 0.5 and 0.7, respectively. In the case of nickel cobalt ferrite, the indexes of refraction are 3.53, 3.57 and 3.47 for ratios of 0.3, 0.5 and 0.7 respectively. We notice a substantial difference in the index of refraction for the Mn0.3Co0.7Fe2O4. This difference may be correlated to a secondary phase formed in this sample.

Keywords

ceramicoptical propertiesFe
Type
Articles
Information
MRS Advances , Volume 2 , Issue 58-59: Nanomaterials , 2017 , pp. 3663 - 3666
Copyright
Copyright © Materials Research Society 2017 

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References

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