Abstract
Mössbauer spectra were taken from thermally quenched solutions of 2 mole % FeCl2/H2O in small temperature steps from 10°K to 255°K. The Mössbauer data, especially the quadrupole splitting, show again the existence of three different phases, connected by irreversible transitions. The temperature dependence of the quadrupole splitting delivers the field parameters of the crystalline field at the iron atom in the three different states. For state I and II the field parameters are consistent with the description of the microstructure of the surroundings of the Fe++-ion as that of a Fe(H2O) ++6 -complex in a disordered (state I) and in an ordered environment (state II). The microstructure of the surroundings of the Fe++-ion in state III is proposed to be that of an Fe{(H2O)4 · Cl2} · 2H2O-complex. As a specialty, the reduction of the quadrupole splitting in state III and in crystalline FeCl2 · 6H2O below 60°K reveals the influence of the spinorbit interaction on the electric field gradient.
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Neuwirth, W., Schröder, HJ. Mössbauer studies of frozen aqueous solutions of iron-II chloride in the temperature range 10°K to 255°K. Z Physik B 23, 71–80 (1976). https://doi.org/10.1007/BF01322263
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DOI: https://doi.org/10.1007/BF01322263