Abstract
AbstractThe reversibility of the Mn2+ → Mn3+ → Mn4+ reaction, in MgO samples containing initially near 1 at.‐ppm of bulk Mn2+ ions is examined as a function of evacuation pretreatments at nearly 1200 K eventually followed by adsorption of H2, D2, or H2O vapor at 298 K. Two bulk e. s. r. signals are observed which correspond respectively to Mn2+ and Mn4+ ions.The Mn lines are strongly affected by adsorption at room temperature or 77 K of various gases and vapors.Mn3+ ions, not detected by e. s. r., must also be present to account for the relative intensity changes of the Mn2+ and Mn4+ species as detected by e. s. r. Electronic conduction paths, must be available between the surface and the bulk.
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