Abstract
Two materials of α-type manganese dioxide were synthesized and examined. They were prepared by the pyrolysis of mixtures of MnCO3 and (CH3)3COK. An ill-ordered material was obtained when prepared at large (CH3)3COK content. Both samples behave as acids, but their apparent capacities are obviously different: about 0.9 meq/g for a well-ordered sample and about 2.6 meq/g for an ill-ordered sample. Ion-exchange properties were examined on Kielland’s plot. Zero intersections of the two samples are almost the same [log \((K_{\rm{H}}^{\rm{M}}){{\rm{\bar x}}_{\rm{M}}} \to 0 \approx - 3.5\) for Na+ exchange and 4–5 for K+ exchange] but slopes are different (about −50 for a well-ordered sample and about −10 for an ill-ordered sample). The difference in slope is likely caused by the flexibility. An evidence of the flexibility can be seen by x-ray diffractometry.
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Tanaka, Y. X-ray diffractometry investigation for ion-exchange properties on alpha-type manganese dioxides. Journal of Materials Research 11, 1030–1036 (1996). https://doi.org/10.1557/JMR.1996.0129
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DOI: https://doi.org/10.1557/JMR.1996.0129