Effect of Particle Size on Transformation of EMD during Digestion in Sulfuric Acid Containing Mn(II)

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Abstract
Lab prepared gamma‐electrolytic manganese dioxide (γ‐EMD) of various particle size was converted to beta phase (betafication) by digesting in sulfuric acid containing Mn(II). The pseudo‐first order rate constant evaluated was found to be a function of temperature and particle size. The activation energy evaluated, however, is independent of the particle size. A proposed mechanism involving nucleation of at EMD surface via equilibration with Mn(II) in the electrolyte followed by the growth of into the core of EMD particles is discussed.

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