Figure 3From: Formation of todorokite from “c-disordered” H+-birnessites: the roles of average manganese oxidation state and interlayer cationsFTIR spectra of “c-disordered” Na-H-birnessites with different Mn(VII)/Mn(II) ratios (a) and their products after Mg-exchange and reflux treatment for 72 h (b).Back to article page