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On the Decomposition of Synthetic Gibbsite Studied by Neutron Thermodiffractometry
Author(s) -
Mercury José Manuel Rivas,
Pena Pilar,
De Aza Antonio H.,
Sheptyakov Denis,
Turrillas Xavier
Publication year - 2006
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.1551-2916.2006.01191.x
Subject(s) - gibbsite , boehmite , thermal decomposition , decomposition , materials science , mineralogy , rietveld refinement , chemistry , analytical chemistry (journal) , crystal structure , crystallography , aluminium , metallurgy , kaolinite , organic chemistry , chromatography
The thermal decomposition mechanism of synthetic Al(OH) 3 (gibbsite) was studied in situ by neutron thermodiffractometry in an ambient atmosphere from room temperature to 600°C with 50°C steps. Gibbsite decomposed to yield AlO·(OH) (boehmite) and then poorly crystallized χ‐Al 2 O 3 . Rietveld analysis was used to refine the cell parameters' variation of gibbsite and its thermal expansion coefficients were obtained: for the a ‐axis: 15±1 × 10 −6 K −1 , for b : 10±2 × 10 −6 K −1 , and for c : 17±2 × 10 −6 K −1 .