Study on the ionic conductivity, dielectric, and optical properties of CsYP2O7compound

The CsYP2O7 compound was synthesized by the classical "solid-state" reaction. The phase identification of the obtained samples was performed by X-ray diffraction proving their crystallization in the monoclinic structure with the P2(1)/c space group. Its morphology and the particle size were evaluated by scanning electron microscope (SEM). The impedance spectroscopy technique was used in order to understand the evolution of the electrical behavior and the relaxation process in this material. Accordingly, the experimental data of the Nyquist were fitted to the equivalent circuit created by a series combination of two cells. As a matter of fact, the DC conductivity exhibits a semiconductor behavior. The AC conductivity obeys the Jonscher's law. The close values, of activation energies, obtained from the dc-conductivity and hopping frequencies, prove that the transport of the charge carrier happens through an ion hopping mechanism, influenced by the motion of the Cs+ cations within the structure of CsYP2O7. The electrical modulus confirms the existence of non-Debye type relaxation behavior. The optical properties of UV-visible spectroscopy for our sample showed that the gap value is equal to 3.7 eV.