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Synthesis of potassium manganese oxides under hydrothermal conditions

Published online by Cambridge University Press:  05 July 2018

T. Endo ,
S. Kume ,
M. Shimada  and
M. Koizumi
T. Endo
Affiliation:
College of General Education, Osaka University
S. Kume
Affiliation:
College of General Education, Osaka University
M. Shimada
Affiliation:
Institute of Scientific and Industrial Research, Osaka University
M. Koizumi
Affiliation:
Institute of Scientific and Industrial Research, Osaka University
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Summary

A 1 M solution of potassium permanganate was sealed in a gold capsule and was treated under conditions of temperature and pressure up to 800 °C and 2·5 kb. Different kinds of products were produced under different conditions of synthesis, and potassium manganate, birnessite, cryptomelane, hausmannite, manganosite, and a new phase appeared. The chemical composition of the new phase was determined as K2Mn4O9 and its X-ray powder diffraction pattern was indexed on a hexagonal cell with a 11·295 and c 21·870 Å.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 305 , March 1974 , pp. 559 - 563
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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