Properties of Yttrium Oxide Ceramics

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Abstract
The cubic structure of yttrium oxide is stable to 1800°C. in air as indicated by petrographic, X‐ray, and differential thermal analyses. A change in lattice parameter of less than ±0.007 a.u. was observed on heating the oxide to 1800°C. The mean specific heat of Y2O3 to 1600°C. was 0.13 cal. per gm. per °C. The coefficient of linear expansion to 1400°C. was 9.3 × 10−6 in. per in. per °C. Compacts of Y2O3 required a temperature of 1800°C. for vitrification. In equimolecular binary mixtures heated in the powdered state at 1500°C., Y2O3 formed compounds with Al2O3 and Fe2O3 and solid solutions with ZrO2 and HfO2. Y2O3 did not react with CaO, MgO, or ThO2. Crystal types and unit‐cell sizes of the reaction products are included.

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