Preparation, structure, surface and impedance analysis of Na2Zn0.5Mn0.5P2O7 ceramics

V. Venckutė; A. Dindune; D. Valdniece; A. Krumina; M. Lelis; V. Jasulaitienė; A. Maneikis; S. Daugėla; T. Šalkus; A. Kežionis; A.F. Orliukas

doi:10.3952/physics.v57i3.3543

V. Venckutė
A. Dindune
D. Valdniece
A. Krumina
M. Lelis
V. Jasulaitienė
A. Maneikis
S. Daugėla
T. Šalkus
A. Kežionis
A.F. Orliukas

DOI: https://doi.org/10.3952/physics.v57i3.3543

Keywords: sodium, pyrophosphate, crystal structure, conductivity, dielectric permittivity

Abstract

The Na₂Zn_0.5Mn_0.5P₂O₇ 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 Na₂Zn_0.5Mn_0.5P₂O₇ is a mixture of two phases: Na₂MnP₂O₇, which crystallizes in – the triclinic space group P1, and Na₂ZnP₂O₇, which crystallizes in the tetragonal space group P42/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 10–10⁹ Hz. The relaxational dispersion of electrical conductivity in the investigated frequency and temperature range was found.