Phyllosilicates

Crystallised phyllosilicates 2:1 of the stevensite or kerolite type characterised by:

• a) the general chemical formula (per half-lattice)
• C2z/mm+Si4(Mg3−z□z)O10(OH)2−uFu,nH2O
• where
• C is the compensation cation formed at least partially by the Mg2+ cation from the reaction medium or a at least one cation introduced by at least one post-synthesis ion exchange process, selected from the group consisting of the cations of elements from groups IA, IIA, IIB and VIII of the periodic table, the cations of rare earths (cations of elements having an atomic number 57 to 71 inclusive), the ammonium cation, the organic cations containing nitrogen,
• m is the valence of the cation C,
• z is a number greater than 0 and less than or equal to 1,
• u is a number greater than 0 and less than or equal to 2,
• n is a real positive number and not zero,
• and □ stands for an octahedral cavity,
• b) an X-ray diffraction diagram characterised by the presence of the following rays:
• one ray corresponding to a value of d060 equal to 1.52±0.01 10−10 m,
• two other rays corresponding to values of dhkl equal to 4.53±0.05 10−10 m and 2.56±0.05 10−10 m,
• at least one reflection 001 such that d001 is between 10.1 and 21.5 10−10 m.