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Experimental and modelized electron paramagnetic resonance spectra of Cr3+ in kaolinite

Two hydrothermal Cr kaolinites were investigated by EPR at both the X-band and the Q-band frequencies. At the X-band frequency, for unoriented powder spectra, Cr3+ presents two main sets of resonances: one at about 170 mT and the other near 600 mT. For oriented films, the spectra present a strong anisotropy, which proves that the signal arises from Cr3+ inside the structure of the phyllosilicates. A transition line at about 110 mT appears and reaches its maximal intensity, like the high-field lines, when the field is perpendicular to the oriented film. At the Q-band frequency the presence of Cr3+ is characterized by the presence of a strong line with a derivative shape near 240 mT. The Cr3+ spectra can be described exactly by a complete spin Hamiltonian, and a computed simulated spectrum for the X-band frequency can be built. The results permit one to conclude that all the observed signals belong to only one EPR spectrum that comes from Cr3+ substituted for Al3+ in the octahedral sites of the kaolinites.