Effect of Zn on dielectric properties of Mn-Zn spinel ferrite synthesized by coprecipitation
| Autor: | Edi Suharyadi, Ade Yusmar, Linda Armitasari |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Spinel Analytical chemistry 02 engineering and technology Dielectric Conductivity engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Dielectric spectroscopy Lattice constant Electrical resistivity and conductivity 0103 physical sciences engineering Dissipation factor Grain boundary 0210 nano-technology |
| Zdroj: | Materials Today: Proceedings. 5:14955-14959 |
| ISSN: | 2214-7853 |
| DOI: | 10.1016/j.matpr.2018.04.037 |
| Popis: | Dielectric properties of Mn1-xZnxFe2O4 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 Mn1-xZnxFe2O4 spinel ferrite at x = 0.3 was 8.559 A 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 (e′) was 427.6, imaginary dielectric (e″) was 253.6, and loss tangent (tanδ) was 0.6. The dielectric real constant (e′), imaginary dielectric (e″) 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 Zn2+ 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. |
| Databáze: | OpenAIRE |
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