Abstract
AbstractThe near normal reflectance spectrum together with the data on the index of refraction and the extinction coefficient are combined in a Kramers‐Kronig analysis to obtain the spectral dependences of the real and the imaginary parts of the diagonal elements of the dielectric function of the single crystal series MnxFe3−xO4 for 0 ≦ x ≦ 1.6. One‐oscillator fit to optical constants is used to show that the main rise in absorption at about 2 eV is due to the 3d‐crystal field transitions of the Fe3+ and/or Mn2+ ions in tetrahedral sites. The anomalous behaviour of optical constants below 1 eV in iron rich Mn‐ferrites is ascribed to the presence of charge carriers (Fe2+) in octahedral sites.
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