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The absorption spectra of NiI2, CdI2:Ni2+, and CoI2 in the wave‐number region 4000 to 16000 cm−1 are reported. The spectra are interpreted in terms of d‐d transitions of Ni2+ and Co2+ ions. Parameters of the electron repulsion, cubic crystal field, and spin‐orbit coupling are estimated. From the latter the transferred spin densities are deduced and compared with Mössbauer data. Birefringence experiments as a function of the temperature show the presence of two phase transitions in niI2.
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Kuindersma et al. (1981) studied this question.
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