Effect of Temperature on the Dielectric Properties of CoFe2O4 Ferrite

Authors V.S. Bushkova , B.K. Ostafiychuk , T.O. Semko

Vasyl Stefanyk Pre-Carpathian National University, 57, Shevchenko st., 76025 Ivano-Frankivsk, Ukraine

Е-mail bushkovavira@gmail.com
Issue Volume 8, Year 2016, Number 4
Dates Received 30 August 2016; published online 23 December 2016
Citation V.S. Bushkova, B.K. Ostafiychuk, T.O. Semko, J. Nano- Electron. Phys. 8 No 4(2), 04069 (2016)
DOI 10.21272/jnep.8(4(2)).04069
PACS Number(s) 75.50.Tt, 43.58.Bh, 77.22. – d, 72.80.Le
Keywords Sol-gel technology, Cobalt ferrite, Impedance spectroscopy (4) , Dielectric permeability, Specific conductivity, Activation energy (6) .

In work the temperature-frequency dependence of the dielectric constants cobalt ferrite prepared by sol-gel participation of auto-combustion was studied by method of impedance spectroscopy. It was found that course of curves represented in coordinates Nyquist, depends on temperature. With increasing frequency the real ε' and imaginary ε'' components of the dielectric permeability decreases through a process of polarization process that is characteristic of the ferrites. In the frequency dependence of the dielectric loss tangent tg δ at a temperature of 298 K at f  56 Hz detected maximum because for this frequency frequency hopping carriers coincides with the frequency of the applied external field. It is shown that with increasing temperature also increases conductivity ferrite CoFe2O4. The dependence of '(f) indicates the existence of conductivity direct current in the sample, which contributed to the significantly increasing of dielectric response with increasing of temperature. It was established that the activation energy carriers ΔEA is 0.49 eV.