Dehydration Transformation in Palygorskite

Abstract

Structural changes accompanying dehydration and thermal transformations in palygorskite have been critically reviewed. Salient features of the 'dehydration mechanisms proposed by various authors have been discussed. Results of some X-ray and electron microscopic studies made by the authors on this problem, clarifying some points in greater detail, have also been included.

Thermal transformation in a chrysotile asbestos

“…Thus the temperature variation of lattice parameters in general shows a contraction along the axial a-direction up to 640°C accompanied by an expansion in the radial c-direction up to 750°C. Contraction of the lattice in general and along the fibre axis, in particular, has been observed in fibrous chain silicate clay minerals (Bhattacherjee and Lokanatha 1984). Hence the present results are on expected lines.…”