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Decomposition of Dolomite Monitored by Neutron Thermodiffractometry
Author(s) -
Aza Antonio H.,
Rodríguez Miguel Angel,
Rodríguez José Luis,
Aza Salvador,
Pena Pilar,
Convert Pierre,
Hansen Thomas,
Turrillas Xavier
Publication year - 2002
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.1151-2916.2002.tb00187.x
Subject(s) - dolomite , periclase , thermal decomposition , decomposition , calcite , rietveld refinement , mineralogy , analytical chemistry (journal) , activation energy , neutron diffraction , chemistry , materials science , crystallography , crystal structure , metallurgy , magnesium , organic chemistry , chromatography
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 kcal·mol −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.