Abstract
Spectroscopic ellipsometry is used to determine the optical properties of the noncrystalline and crystalline Mn1.56Co0.96Ni0.48O4 (MCN) films prepared by chemical solution deposition method in the range of 250–1100 nm. A pronounced difference in the optical functions is found between 500 and 600 °C. Two distinctive peaks, attributed to the critical points of the MCN films, appear in the optical constant spectra for the films annealed at 600 °C while they are not obvious for the films annealed at 500 °C. The presented results are instructive, further understanding the physical properties of transition metal oxides in theory.
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