Abstract

Sodium cobalt monophosphate (γ-NaCoPO₄) compound was synthesized by a solid-state reaction. X-ray powder diffraction analysis indicated that this sample is well crystallized in the monoclinic system Zéolite ABW structure with P2₁/n space group. The vibrational study showed the appearance of the tetrahedral PO₄ and its vibrations. The electrical measurements of this compound were analyzed by complex impedance in the frequency range (43Hz-102MHz) at several temperatures. Nyquist plot at several temperatures revealed a single semicircle associated to the grains. The temperature dependence of the conductivity for the grain obeys to the Arrhenius law. The AC conductivity is insured by a process defined as a hopping transport mechanism. The thermal behaviors of the exponent ‘S’ indicate that the Correlated Barrier Hopping model (CBH) is the most dominant mechanism. The analysis of the data unfolded that the optical gap energy is determinate using Kubelka-Munk function and the value of Urbach energy is equal to 0.395eV.

Keywords: X-Ray diffraction; FT-IR FT-Raman spectroscopies; Impedance spectroscopy; Optical properties