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Clays and Clay Minerals; June 2006; v. 54; no. 3; p. 390-401; DOI: 10.1346/CCMN.2006.0540310
© 2006 Clay Minerals Society
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X-RAY DIFFRACTION LINE BROADENING ON VIBRATING DRY-MILLED TWO CROWS SEPIOLITE

Joaquin Bastida1, Marek A. Kojdecki2, Pablo Pardo1 and Pedro Amorós3

1 Departamento de Geología, Universidad de Valencia, 46100 Burjasot, Valencia, Spain
2 Instytut Matematyki i Kryptologii, Wojskowa Akademia Techniczna, 00-908 Warszawa, Poland
3 Instituto de Ciencia de Materiales, Universidad de Valencia, 46071 Paterna, Valencia, Spain

* E-mail address of corresponding author: bastida{at}uv.es

A reference sample of sepiolite and products of its comminution by vibrating dry-milling have been studied using X-ray diffraction (XRD) line-broadening analysis, complementary field emission scanning electron microscopy (FESEM) images and surface area measurements. The apparent crystallite sizes determined via XRD are in agreement with observations on FESEM images. The sepiolite aggregates consist of lath-shaped agglutinations of prisms and pinacoids elongated along [001], each lath including several crystallites in that direction. The surface area magnitudes are in the range of previous experimental measurements of other sepiolites. The results obtained show the effectiveness of vibro-milling as the procedure to use for the comminution of sepiolite.

Key Words: Crystallite Size • Crystalline Lattice Strain • Line Broadening • Nevada Sepiolite • Reference Clay • Sepiolite • Surface Area • X-ray Diffraction






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