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Small‐angle X‐ray scattering analysis of porous powders of CaCO 3
Author(s) -
Chavez Panduro Elvia Anabela,
Beuvier Thomas,
Fernández Martínez Manuel,
Hassani Leila,
Calvignac Brice,
Boury Frank,
Gibaud Alain
Publication year - 2012
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889812032219
Subject(s) - scattering , small angle x ray scattering , small angle scattering , materials science , supercritical fluid , porosity , gyration , fractal dimension , adsorption , porous medium , small angle neutron scattering , optics , fractal , composite material , chemistry , geometry , physics , thermodynamics , neutron scattering , mathematical analysis , mathematics
The results of small‐angle and ultra‐small‐angle X‐ray scattering on porous CaCO 3 microparticles of pulverulent vaterite made by a conventional chemical route and by using supercritical CO 2 are presented. The scattering curves are analysed in the framework of the Guinier–Porod model, which gives the radii of gyration of the scattering objects and their fractal dimension. In addition, the porosity and the specific surface area are determined by using the Porod invariant, which is modified to take into account the effective thickness of the pellet. The results of this analysis are compared with those obtained by nitrogen adsorption.