Über die Farbe von „NiO" / The Different Colours of „NiO”

Abstract

Abstract Depending on the method of preparation ,,NiO”-single crystals of different colours can be synthesized. It is shown by ligand field spectroscopy that the ligand field and interelectronic repulsion parameters are the same for the green, yellow and brown crystals. There is definite spectroscopic evidence, that the colour of stochiometric NiO is green