Instability of FeCO 3 in air

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ID: 298827
1966
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Abstract
The rate of dissociation of FeCO ~3~ to alpha -Fe ~2~ O ~3~ in air over the temperature range 25 degrees to 300 degrees C is practically independent of the initial amount of material and is a function of grain size and temperature. The order of reaction is approximately, but not exactly, one. The activation energy at 25 degrees C is between 9.5 and 11.1 Kcal mole (super -1) . The time of complete dissociation at 25 degrees C is approximately 35 years for 300 mesh grain size, 65 years for -200 to +300 mesh, 370 years for -60 to +100 mesh, and many thousands of years for an ideal crystal three inches across. Metastability of FeCO ~3~ of 25 degrees C is explained by a thin surface layer of hexagonal close-packed alpha -Fe ~2~ O ~3~ in the same way as the metastability of Al surrounded by a coating of Al ~2~ O ~3~
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openalex_W2316941126 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors M. K. Seguin
Journal american journal of science
Year 1966
DOI
10.2475/ajs.264.7.562
URL
https://ajs.scholasticahq.com/article/59141.pdf
Keywords Keywords not found

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