Abstract
New Zn2P2O7, K2ZnP2O7 and KZn1.5P2O7 compounds were synthesized with conventional solid solid reaction method. The optical properties have been studied by using UV–Visible spectrophotometer. The optical band gaps (Eg) were found to be 3.76 eV, 3.39 eV and 3.59 eV respectively. Optical parameters such as refractive index, Cauchy’s parameters and conductivity were deduced. The refractive index fitting in the visible range and the dispersion parameters (E0 and Ed) of these compounds were estimated using the Wemple–DiDomenico model.
Highlights
Diphosphates are technologically important because of their various properties like fluorescent, luminescent, semiconductor, catalytic, dielectric, magnetic, and ion-exchange [1]
The Zn2P2O7 structure reveals twelve form groups per mesh formed by three types of phosphorus and three types of Zn2+ cation, it can be described by the alternation of anionic and cationic layer in (0, 1, 0) direction
The anionic layer is formed by infinite chains of dimer P2O74, which develop in the a direction
Summary
Diphosphates are technologically important because of their various properties like fluorescent, luminescent, semiconductor, catalytic, dielectric, magnetic, and ion-exchange [1]. To calculate the optical band gap of these phosphor materials, the absorption spectra so obtained for each sample was converted into a remission function [10]: α. The refractive index can be analyzed to determine the average oscillator wavelength 0 and oscillator length strength S0 of the studied samples These values can be obtained using this equation: s0λ02 − (λλ0). The optical response of material is mainly studied in terms of the optical conductivity ( opt) which can be obtained from the absorption coefficient (α) and refractive index (n) using the following equation [23]: Where c is the light velocity. This result can be explained by the smallest gap energy of the K2ZnP2O7 sample
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