『Abstract
We report on a paramagnetic anisotropy study of three layered
phyllosilicates. The mineral samples were characterized through
X-ray powder diffraction (XRPD), X-ray photoelectron spectroscopy
(XPS) and electron paramagnetic resonance (EPR). Based on EPR
measurements of samples oriented parallel or perpendicular to
the magnetic field lines, we show how the substitutional iron
is transformed from Fe(II) (biotite) into Fe(III) (muscovite and
kaolinite) species and from axial Fe(III) coordination sites (muscovite)
to rhombic (kaolinite) sites in response to weathering』
Introduction
Experimental
Results
Discussion and conclusions
Acknowledgements
References