Preparation, structure, surface and impedance analysis of Na₂Zn_0.5Mn_0.5P₂O₇ ceramics

Abstract

The Na 2 Zn 0.5 Mn 0.5 P 2 O 7 powder was prepared by the solid state reaction method. The powder structure was studied by X-ray diffraction (XRD) in the temperature range from room temperature (RT) to 520 K. The results of XRD measurements show that the obtained Na 2 Zn 0.5 Mn 0.5 P 2 O 7 is a mixture of two phases: Na 2 MnP 2 O 7 , which crystallizes in the triclinic space group P -1, and Na 2 ZnP 2 O 7 , which crystallizes in the tetragonal space group P4 2 /mmm. The chemical compositions of the powder and ceramic samples were investigated by an energy dispersive X-ray spectrometer (EDX) and X-ray fluorescence spectroscopy (XFS). The surface of ceramics was examined by X-ray photoelectron spectroscopy (XPS). The electrical conductivity and dielectric permittivity of the ceramics were investigated from RT to 700 K in the frequency range 10-10 9 Hz. The relaxational dispersion of electrical conductivity in the investigated frequency and temperature range was found.