Preparation and Characterization of Open Tunnel Oxide ALPHA-MnO2 Precipitated by Ozone Oxidation

We succeeded in synthesizing the hydrogen coinserted hydrated potassium molybdenum bronzes (HKBz) with the 8- and 6coordination structures by a direct new reduction method. By this method, the 8-coordination type was obtained. According to NMR results, the behavior of protons in the 8-coordination type was different from those in the 6-coordination type. We obtained the single phase of purple sodium molybdenum bronze when hydrogen coinserted hydrated sodium bronze (HNaBz) controlled the content of hydrogen, and sodium was heated in nitrogen. Also, we obtained the blue and red potassium bronzes by heating HKBz and controlling the contents of hydrogen and potassium.