## Abstract γ‐MnO~2~ can be partly reduced with N~2~H~2~ without changing its lattice. The volume of the elementary cell increases approximatly linearly with decreasing Mn^IV^ content. It is assumed that the reduction occurs in a one phase topochemical reaction, electrons and protons migrating thro
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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