THE EFFECT OF MAGNETIC-INTERACTIONS ON X-RAY PHOTOELECTRON (2P SHELL)SPECTRA OF OCTAHEDRAL NICKEL(II) IN NIO AND FERRIMAGNETIC MIXED OXIDES

In contrast to the satellite (found in all cases of Ni(II) with triple t ground state) at 6 to 7 eV higher binding energy than the Ni2p3/2 si gnal, another satellite at only 1.8 eV higher binding energy occurs in antiferromagnetic NiO and ferrimagnetic (such as NiFe2O4) compounds, but is absent in paramagnetic NiGa2O4 or Ni0.4Mg0.6O, and disappears a t the magnetic transition in the spinel Ni1-xZnxFe2O4. The detailed op tical spectra show states of eight d-like electrons in Ni(II) without any need of strong mixing with d9 and d10.