Synthesis of potassium manganese oxides under hydrothermal conditions
- 1 March 1974
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 39 (305) , 559-563
- https://doi.org/10.1180/minmag.1974.039.305.08
Abstract
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.Keywords
This publication has 6 references indexed in Scilit:
- Coronadite; modes of occurrence and originEconomic Geology, 1971
- Mineralogy of the different genetic types of manganese depositsEconomic Geology, 1968
- Investigations under hydrothermal conditionsPhysics and Chemistry of the Earth, 1956
- Electron diffraction evidence for the existence and fine structure of a cryptomelane modification of manganese dioxide prepared in the absence of potassiumActa Crystallographica, 1952
- Study of the modifications of manganese dioxideJournal of Research of the National Bureau of Standards, 1948
- An X-Ray Diffraction Study of Manganese DioxideTransactions of The Electrochemical Society, 1947