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ABSTRACT On the basis of spectroscopic studies of (NH2(C2H5)2)2CoCl4 crystals, the absorption bands corresponding to the internal electronic transitions in the Co2+ ion were identified. The values of the crystal… Click to show full abstract
ABSTRACT On the basis of spectroscopic studies of (NH2(C2H5)2)2CoCl4 crystals, the absorption bands corresponding to the internal electronic transitions in the Co2+ ion were identified. The values of the crystal field and Racah parameters were calculated. The temperature evolution of the absorption spectra of (NH2(C2H5)2)2CoCl4 crystals reveals the anomalies of their parameters at the points of phase transitions. The corresponding changes of the absorption spectra were discussed in terms of distortion of the metal-halogen complex. The temperature dependences of the absorption spectra of (NH2(C2H5)2)2CoCl4 crystals confirm the presence of the thermochromic phase transitions at 255 and 330 K.
Journal Title: Phase Transitions
Year Published: 2019
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