Local structural properties of (NiF6)4− clusters in perovskite fluorides RbMF3 (M = Cd2+, Ca2+, Mg2+) series: EPR and optical spectra study in tetragonal and trigonal ligand field

Local structural studies of (NiF6)4− clusters in perovskite fluorides RbMF3 (M = Cd2+, Ca2+, Mg2+) series based on the EPR and optical spectra in tetragonal and trigonal ligand field.