M\"ossbauer Spectroscopic Study of Amorphous Fe-Gluconate

TL;DR

This study uses Mössbauer spectroscopy and X-ray diffraction to analyze the lattice dynamical properties of amorphous Fe-gluconate, revealing details about its vibrational behavior and phase composition.

Contribution

It provides the first detailed Mössbauer spectroscopic analysis of amorphous Fe-gluconate, including lattice dynamical parameters and phase characterization.

Findings

Majority Fe(II) phase (72%) identified

Minor Fe(III) phase (28%) identified

Lattice vibrations are mostly harmonic

Abstract

Amorphous Fe-gluconate was studied by means of the X-ray diffraction and M\"ossbauer spectroscopy. Spectra measured in the temperature range between 78 and 295 K were analysed in terms of three doublets using a thin absorber approximation method. Two of the doublets were associated with the major Fe(II) phase (72%) and one with the minor Fe(III) phase (28%). Based on the obtained results the following quantities characteristic of lattice dynamical properties were determined: Debye temperature from the temperature dependence of the center shift and that of the spectral area (recoil-free factor), force constant, change of the kinetic and potential energies of vibrations. The lattice vibrations of Fe ions present in both ferrous and ferric phases are not perfectly harmonic, yet on average they are. Similarities and differences to the crystalline Fe-gluconate are also reported.