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Pure and doped manganese dioxides were prepared by wet-chemical method using fumaric acid and potassium permanganate as raw materials. X-ray diffraction patterns show that pure and Al, Cu and Mg doped manganese dioxides (d-MnO 2 ) crystallized in the cryptomelane-MnO 2 structure. Thermal analysis show that, with the assistance of potassium ions inside the 2×2 tunnel, the presence of...
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