Paramagnetic Resonance Absorption Spectrum of Trivalent Iron in Single-Crystal Calcite

Characterization of the Crystal Quality of Calcites by Electron Paramagnetic Resonance

“…the variation of the resonant field B, with the angle CI between c-axis and field direction. This proportionality was observed for Fe3+ in quartz [3] and calcite [4].…”

Accurate determination of the spin Hamiltonian parameters for Mn2+ ions in cubic ZnS nanocrystals by multifrequency EPR spectra analysis

“…Therefore, due to the important role that the line broadening plays in the determination of the SH parameters in nanocrystals, we shall firstly discuss its importance and role in the line shape simulations of the EPR spectra of the Mn 2+ in crystalline powders. The EPR line broadening effect has been observed even in single crystals of high structural perfection doped with Mn 2+ , such as calcite [23], tungstates [24][25][26] or cZnS [13]. Its presence was attributed to random strains, electrical fields and other perturbations from the extended lattice defects in the crystal lattice [27], resulting in a variation in the local crystal field at the paramagnetic ions, both in magnitude and orientation.…”

Provenance of archaeological limestone with EPR spectroscopy: the case of the Cypriote-type statuettes

“…7b) four peaks at g=14.25, 5.9, 3.7 and g=2.9 are observed in all carbonate (calcitic) rocks (marble, limestone, dolomite). They are attributed to Fe 3+ substituting for Ca 2+ in the calcium carbonate lattice [23,28]. The peak at g=4.3 corresponds to a strong component due to Fe 3+ in orthorhombic symmetry (silicates and oxides, [19]) and a weak one due to Fe 3+ in the carbonate lattice.…”