Recently I synthesized nanoparticles of MnO2.

I mixed KMnO4 and MnSO4.H2O in deionized water and stirred them for 2 hours. Then I put them into an autoclave in 140°C for 12 hours. I used a paper as guidance for this procedure, but received unexpected results. After the XRD analysis no obvious peaks could be observed, although a peak for the crystalline structure, as well as other peaks were expected. What are the probable reasons for this problem? Any suggestions?

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