Abstract
Elastic moduli of polycrystalline HfO2 and ZrO2 stabilized with 33 mol% Praseodymium oxide or terbium oxide were studied as functions of porosity and temperature. Thermal expansion was measured to 1200°C for each composition. The modulus‐vs‐porosity and thermal expansion curves were typical; however, modulus‐vs‐temperature relations were abnormally steep below 400°C, a phe nomenon observed previously for stabilized HfO2 compositions. All compositions exhibited obvious stoichiometric changes resulting from oxidation‐reduction annealing, but only the Tb4O7‐stabilized ZrO2 showed any significant effect of oxidation state on the modulus values; this effect was very pronounced.
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