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Infrared absorption spectra of some Manganese Dioxide Modifications and their thermal products
Author(s) -
Kolta G. A.,
Kerim F. M. Abdel,
Azim A. A. Abdul
Publication year - 1971
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19713840311
Subject(s) - manganese , infrared spectroscopy , infrared , amorphous solid , absorption (acoustics) , absorption spectroscopy , spectral line , analytical chemistry (journal) , materials science , chemistry , optics , crystallography , environmental chemistry , organic chemistry , metallurgy , physics , astronomy , composite material
The infrared absorption spectra of α‐, β‐, γ‐ and δ‐ MnO 2 prepared by different methods, were measured and discussed. It was found that the ratio of absorbancies of the bands at 595 ± 20 cm −1 und 535 ± 20 cm −1 (φ) is related to the amorphous content. Each preparation is characterized by a certain value of φ. The mode of change of φ as a result of heating the different preparations is discussed. Infrared spectra help in differentiating α‐, γ and δ‐MnO 2 on the one hand, and β‐MnO 2 on the other, and in indicating the transformation of γ‐into β‐MnO 2 by heating the former at 450 °C.