Abstract
We show that the formation of an ordered phase of transition metal impurities in ionic crystals can be monitored by means of crystal field spectroscopy of the d- d vibronic excitons. We present an optical absorption study of the Suzuki phase NiNa 6□Cl 8 in doped NaCl:Ni, in combination with ionic thermocurrent measurements and Raman spectroscopy. We find that the complex crystal field spectra are due to the coexistence of the Suzuki phase with free impurity-vacancy dipoles. The comparison with the frequencies and the absolute absorption intensities of crystal field transitions in NiCl 2 yield detailed structural information (long range order, point symmetry and anion relaxation) on the Suzuki phase, and an accurate determination of the phase concentrations.
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