Why does the EPR spectrum of MnO2 powder exhibit such wide peaks?

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Yuri Mirgorod

Yi Wan

Width of signal is due to the presence of the dipole-dipole and

exchange interaction between Mn4+ ions

Article Electron paramagnetic resonance of MnO2 powders

Yuri Mirgorod Dear Yuri, thank you very much for your answer. But what is the dipole-dipole interaction?

See for yourself on Wikipedia