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Small‐Angle X‐ray Scattering Study of the Thermal Decomposition of Magnesium Hydroxide
Author(s) -
Vollet Dimas Roberto,
Varela José Arana
Publication year - 1991
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.1151-2916.1991.tb06822.x
Subject(s) - small angle x ray scattering , scattering , materials science , porosity , isothermal process , thermal decomposition , particle size , volume fraction , chemistry , analytical chemistry (journal) , mineralogy , physics , thermodynamics , optics , composite material , chromatography , organic chemistry
The submicroscopic porous structure developed in the isothermal decomposition of Mg(OH) 2 was studied in situ by means of small‐angle X‐ray scattering (SAXS). The scattering intensity in the 100% decomposed system has a good fit with an exponential correlation function, g(r) = exp(‐ r/a ) (where a is the correlation distance), according to the Debye, Anderson, and Brumberger (DAB) model which holds for a random distribution of pore shape and size in the solid. The DAB correlation distance is about 3.2 nm for systems decomposing at 583 and 623 K. According to the available pore volume fraction, such a correlation distance would imply a porous structure built up by pores of 7‐nm mean size randomly distributed in a solid skeleton of 6‐nm mean particle size.