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Electron spin resonance spectra measured in CrO4 3− doped fluoroapatite Ca5(PO4)3F single crystals at liquid helium temperature show the presence of three magnetically nonequivalent chromate (V) tetrahedra indicating that hexagonal (P63/m) fluoroapatite similar to chloro- and hydroxyapatite undergoes a phase transition at low temperature to a phase of lower symmetry. Spin-Hamiltonian parameters determined by an analysis of the electron spin resonance spectra are presented. The ground state of the unpaired d1 electron is found to be dz2.
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Greenblatt et al. (1977) studied this question.
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