Decomposition of Dolomite Monitored by Neutron Thermodiffractometry (original) (raw)
Dolomite powder from Coín (Spain) was heated in air at a constant rate of 2°C/min to 1000°C, while neutron diffraction patterns were collected every 150 s. Rietveld refinement was applied and raw intensity data were used to monitor decomposition. The full process happened in two stages: dolomite decomposition to give calcite and periclase, and calcite breakup. The first stage activation energy was 47 kcal⅐mol ؊1 from fitting to a contracting sphere model. The dolomite mean thermal expansion coefficients were (6.7 ؎ 0.4) ؋ 10 ؊6 and (2.7 ؎ 0.2) ؋ 10 ؊5 K ؊1 along the a and c axes, respectively. Changes in the Ca-O and Mg-O bond distances were also measured.
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