MnOOH compounds

Is unstable compound, oxidizes in air to MnOOH Heat by steam to prevent crystallization... 

Sato et al. [33] described the endothermic dehydration of y-MnOOH in nitrogen as yielding MnO, 53 at 548 K and further reaction to a- Mn203 at 913 K. In air at 493 K, this compound undergoes successive water loss and oxidation to form P-Mn02 which decomposes to a-Mn203 at 823 K. 

As a demonstration of the PCA method, we have analyzed simulated data produced by summing together measured spectra from three compounds (y-MnOOH, MnS and ) in various proportions and adding noise. The spectra are shown in Figure 18a. Visual inspection shows that there is more than one component. If one plots the spectra without the vertical offsets shown, one finds that there are no values of the abscissa for which all the curves meet, as would be the case if there were only two components. 

The samples were synthesized using y-MnOOH, LiNO, and Ni(OH)2 or Co(OH)2 as the starting materials. In the case of LiCo n2 04 compounds, all... 

There is much evidence that Mn(Ill) compounds in solution disproportionate to yield Mn(Il) and Mn(IV) [7] such reactions appear to be of underlying importance in the role of the Mn(IV)/Mn(lII) system in photosynthesis [8]. Apart from the previously mentioned hausmannite, naturally occurring solid Mn(lll) compounds are again oxides or hydrated oxides, e.g., bixbyite (Mn20, braunite (3Mn203-MnSi03), and manganite (MnOOH). 

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