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

Abstract


The Na2Zn0.5Mn0.5P2O7 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 Na2Zn0.5Mn0.5P2O7 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.

Keywords


sodium; pyrophosphate; crystal structure; conductivity; dielectric permittivity

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

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