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Research & Reviews : Journal of Physics

Cerium Admixture Effect on the Surface Magnetic Properties of Ceramics Based on Yttrium Oxide

  1. O.M. Lavrynenko
  2. Yu.M. Bataiev
  3. M.M. Bataiev
  4. O. Yu. Pavlenko
  5. O.A. Kornienko

Abstract

The influence of 10 mol.% cerium oxide dopant on phase transformations, morphology, and surface magnetic properties (magnetic structure) of polycrystalline ceramics obtained in the CeO2–Y2O3 system, depending on the conditions of its heat treatment, was studied. Using the X-ray phase analysis method, it was established that heat treatment at 120°C does not lead to the interaction of the initial components, and when the oxide mixture is fired at a temperature of 1500°C, the formation of a cubic solid solution of Ce-Y2O3 substitution is observed. Electron paramagnetic resonance spectra of nanopowder with a composition of 90 mol.% Y2O3- 10 mol.% CeO2 and ceramics on their base can demonstrate significant changes in their spectroscopic characteristics and in the form of Y3+ cations in the samples’ structure, which are correlated into a homogenized sample of cubic yttrium oxide at T = 1500°С. Temperature treatment of the Ce0.1Y0.9O1.95 sample at 1100°С leads to the intensive formation of the (Ce3+1-хY3+х)Ce4+O2 phase, which causes the narrowing of the corresponding spectral lines and characterizes the decrease in the Curie temperature (Tc) for the RZO samples. For a temperature of 1500°С, the narrowing and increasing intensity of the corresponding spectral line corresponds both to the appearance of the main cubic oxide phase as a result of the complete replacement of Ce3+ ions by Y3+ ions for Ce0.1Y0.9O1.95, and to the formation of a complex oxide (Ce3+1-хY3+х) Ce4+O2.

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