Abstract
The portions of the systems ZrO2–Fe2O3, ZrO2–SnO2, and ZrO2–Cr2O3 which have the monoclinic ZrO2 structure have been investigated by X-ray powder diffraction. The introduction of FeIII, SnIV, and CrIII into the monoclinic ZrO2 structure causes the volume of the unit cell to decrease. In each system the solubility limit occurs at a unit cell volume of ca. 140·5 Å3.

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