Fig. 4: Calibration of Fe-related electronic transitions molar extinction coefficients between glass matrices. | Communications Materials

Fig. 4: Calibration of Fe-related electronic transitions molar extinction coefficients between glass matrices.

From: Universal method for polyvalent ions’ redox state quantification in inorganic materials down to trace concentrations

Fig. 4: Calibration of Fe-related electronic transitions molar extinction coefficients between glass matrices.

a Concentration-dependent oxidized fraction in Fe-bearing NaP and NaB glasses, determined utilizing the QOS (filled symbols) and QRS (open symbols) methods. The labels indicate the nominal Fe concentration in at.%. Photographs of the NaP-Fe samples are presented in the inset, highlighting the characteristic yellow to dark brown colors of Fe3+-containing glasses2,61. b Optical absorption spectra of Fe-bearing NaP glasses with increasing nominal Fe concentration. Fe3+- and Fe2+-related electronic transitions are highlighted. Slight deviations at small wavenumbers are ascribed to residual water. c Concentration- and host-dependent molar extinction coefficients of Fe3+- and Fe2+-related electronic transitions. Values obtained in the present work are shown with symbols, and those from literature with dashes2,55,57,61,62,63,64,65,66,67,68. The absorption coefficient values for Fe-bearing NaP glasses at low doping levels are too small and therefore not indicated.

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