Abstract
Triethylene glycol (TEG) stabilized Mn1−xZnxFe2O4 nanoparticles were synthesized via a glycothermal reaction. The crystalline structure of nanoparticles were confirmed by X-ray powder diffraction and the surface conjugation of TEG was confirmed by Fourier transform infrared spectroscopy and thermal gravimetric analysis. The ac conductivity (σac), dc conductivity (σdc), dielectric permittivity and dissipation factor of the nanocomposites were determined as a function of temperature in the range from 20 to 150 °C at frequencies 1 Hz to 1 MHz. The conductivity measurements reveal that both σac and σdc conductivities are strongly temperature dependent. The σdc increases significantly with temperature and displays a maximum conductivity of about 8.86 × 10−7 S cm−1 for x = 0.0 at 150 °C. Study of the real (ε′) and imaginary (ε″) parts of the dielectric permittivity exhibited interfacial polarization and temperature-assisted reorganization effects.
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•TEG@MnFe2O4 nanocomposite was synthesized via a simple polyol route.•Triethylene glycol can serve as a stabilizer to control the particle growth.•VSM confirmed the superparamagnetic character of these nanoparticles.•TEG@MnFe2O4 nanocomposite showed thermally activated conductivity.