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Über ein- und zweiphasige Reduktion von γ-MnO2 durch Zimtalkohol

✍ Scribed by R. Giovanoli; K. Bernhard; W. Feitknecht


Publisher
John Wiley and Sons
Year
1968
Tongue
German
Weight
841 KB
Volume
51
Category
Article
ISSN
0018-019X

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✦ Synopsis


The reduction of y-MnO, with cinnamic alcohol in xylene a t 90" leads (1) to y-MnOOH in a double phase reaction with germination if the y-MnO, is extremely disperse, and (2) to u-MnOOH in a strictly topotactical (single phase) reaction without germination if the y-MnO, is relatively well crystallised. The hexagonality of the densest packed oxygens is not a linear function of the reduction rate but shows a discontinuity when about half of the Mn4+ are reduced, which is consistent with results of GABANO. The a-MnOOH obtained by this reaction shows still the selective and asymmetric X-ray and electron reflection broadening of the reactant. Hence, the authors consider the product to possess an intergrowth structure of a Groutite matrix with statistically and layerwise distributed Manganite microdomains, according to a model proposed by DE WOLFF for y-MnO,. The domains are supposed to have the size of one cell only in the b direction, and of a few cells in the a direction, and to be present in relatively small concentration.


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