Manganese Oxide Structures

Table 19.3 Ciystallographic summaty of tunnel and layered manganese oxide structures with corresponding bulk magnetic properties. 

Table 1. Crystallographic data for manganese oxides with tunnel structures... 

The enormous variety of manganese oxides with structures similar to the one shown in Fig. 8 arises from the different cation and water content of the space be-... 

Figure 8. Schematic drawing of the layered manganese oxides. The structure consists of a stacking of empty and Mn(III, IV)-filled layers of edge-sharing octahedra.

The crystal structure of the mineral chalcophanite, ZnMn307-3H20 (see Fig. II), was one of the first layer structures of manganese oxides that has been determined. 

Nanomaterials can also be tuned for specific purposes through doping. Specifically, the effect of the presence of manganese oxides on photocatalysis involving primarily titanium dioxide will be considered in this section. Titanium dioxide is a well-known photocatalyst and will be considered separately. K-OMS-2, which has a cryptomelane structure, is illustrated in Figure 8.4. Not all the literature discussed in this section, however, involves OMS tunnel structure materials. For example, amorphous manganese oxide (AMO) is also discussed as a photocatalyst. Manganite (MnOOH) is also included in battery applications. 

---