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Elastic Properties of Monoclinic Hafnium Oxide at Room Temperature

S L Dole, O Hunter Jr., and C J Wooge
J. Am. Chem. Soc 60, 488 (1977)

The Young's and shear moduli of polycrystalline monoclinic hafnium oxide were determined by the sonic resonance method at room temperature as a function of volume fraction porosity. The Spriggs equation empirically described the data and the zero porosity moduli as 283.6 GN/m² and 109.2 GN/m² for Young's and shear moduli, respectively. The Debye temperature calculated from the elastic constants was 484°K. Several specimens had anomalously low moduli values, attributed to microcracking. Grain size and internal friction measurements showed that the microcracking occurred in specimens with grain sizes > 2 to 3 μm and was characterized by high internal friction.