The electron paramagnetic resonance spectra of carbonate centers in apatites of different compositions were measured at 77 to 290K. The results indicated that the F–:OH– ratio on the 63 axis and the state of constitutional water (H2O molecules) determine vibronic interactions in the CO2–, CO3–, and CO33– centers and the parameters of their electron paramagnetic resonance spectra. Depending on the molecular water and OH– contents, the spectra of the carbonate centers were isotropic or anisotropic, due to the dynamic or static Jahn-Teller effect. Computer simulation was used to estimate the contributions of the centers to the electron paramagnetic resonance spectrum.

Electron Paramagnetic Resonance Spectra of Carbonate Centers in Natural Apatites. L.G.Gilinskaya: Inorganic Materials, 2005, 41[5], 503-8