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X-ray diffraction and Mössbauer spectroscopy of the system m-ZrO2-alpha-Fe2O3

X-ray diffraction showed that the terminal solid solubility limits at room temperature (RT) were: (2.0+/-0.3) mol% of alpha-Fe2O3 in m-ZrO2 and (1.0+/-0.3) mol% of m-ZrO2 in alpha-Fe2O3. The unit-cell parameters of the sample m-Zr0.995Fe0.010O2.005 were found different from those of m-ZrO2, indicating an asymmetric distortion of the crystal lattice of m-ZrO2 caused by dissolution of only 0.5 mole % of alpha-Fe2O3. The 57Fe Moessbauer spectrum (RT) of the same sample showed a quadrupole doublet with parameters d = 0.299 mm s-1 and delta = 1.256 mm s-1, which can be ascribed to the formation of solid solutions at the ZrO2-rich side. Similarly, the decreased value of hyperfine magnetic splitting indicated the formation of solid solutions at the Fe2O3-rich side.

Zirconia. m-ZrO2-alpha-Fe2O3 system. Structural properties.

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