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Thermal Analysis of Magnesite at CO 2 Pressures up to Six Atmospheres
Author(s) -
STONE ROBERT L.
Publication year - 1954
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1954.tb14003.x
Subject(s) - magnesite , endothermic process , thermal decomposition , decomposition , thermodynamics , differential thermal analysis , analytical chemistry (journal) , atmosphere (unit) , mineralogy , materials science , chemistry , metallurgy , environmental chemistry , physics , organic chemistry , magnesium , optics , adsorption , diffraction
The literature contains contradictory statements that the decomposition of magnesite is and is not affected by the pressure of CO 2 during the decomposition reaction. By means of the new variable‐pressure differential thermal analysis technique, samples of Washington and Nevada magnesites were run at CO 2 pressures over the range 0.001 to 5000 mm. Hg. At 0.001 mm. Hg the endothermic loop starts at approximately 350°C., at 500° C. for 1 atmosphere of CO 2 , and at 612°C. under 5000 mm. Hg pressure of CO 2 . The results permit straightforward analysis of the mechanics of decomposition and comply with the Clausius‐Clapeyron and Van't Hoff equations at CO 2 pressures above 250 mm. Hg.