Effect of Zn on dielectric properties of Mn-Zn spinel ferrite synthesized by coprecipitation

 
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Materials Today: Proceedings 5 (2018) 14955–14959 
www.materialstoday.com/proceedings
 
2214-7853 © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license 
(http://creativecommons.org/licenses/by-nc-nd/4.0/). 
Selection and/or Peer-review under responsibility of 3rd International Conference on Applied Physics and Materials Applications. 
ICAPMA_2017
Effect of Zn on dielectric properties of Mn-Zn spinel ferrite 
synthesized by coprecipitation 
Ade Yusmar
a,
Linda Armitasari
a 
and Edi Suharyadi
a,
* 
a
Department of Physics, Universitas Gadjah Mada, Indonesia 
Abstract 
Dielectric properties of Mn
1-x
Zn
x
Fe
2
O
4
Spinel ferrite with various Zn concentration (x = 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8) have been 
investigated over a wide frequency range 5–120 kHz by impedance spectroscopy. The X-ray diffraction (XRD) revealed the 
formation of mixed spinel phase structure. The crystallite sizes were in the range 15 to 30 nm. The lattice parameter of Mn
1-x
Zn
x
Fe
2
O
4
spinel ferrite at x = 0.3 was 8.559 Å and then decreases by increasing Zn concentration. This is due to the replacement of larger radius 
ionic of Mn
+2
. For sample at x = 0.3, the dielectric real constant (εʹ) was 427.6, imaginary dielectric (εʺ) was 253.6, and loss 
tangent (tanδ) was 0.6. The dielectric real constant (εʹ), imaginary dielectric (εʺ) and loss tangent decrease with the increase of Zn 
concentration. Zn concentration would affect to availability of ferrous and ferric ions in the octahedral sites which is 
preferentially occupied by Zn
2+
ion. The study also observes for the dielectric properties and AC conductivity dependence on 
frequency. The dielectric constant decreases by increasing frequency. The highest dielectric properties was x = 0.5 on frequency 
5 kHz. The maximum AC electrical conductivity (σ) was 3.4
⨉10
-4
at 25 kHz observed for concentration x = 0.3. The increase in 
AC conductivity with frequency can be explained on the basis of Koop’s model. The dielectric constant and conductivity at low 
frequency are due to the existence of grain boundary while the dispersion in the high frequency region is due to the conducting grains. 
© 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license 
(http://creativecommons.org/licenses/by-nc-nd/4.0/). 
Selection and/or Peer-review under responsibility of 3rd International Conference on Applied Physics and Materials Applications.
Keywords: Spinel ferrite; Dielectric properties; AC conductivity