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Elastic Properties of Hafnium and Zirconium Oxides Stabilized with Praseodymium or Terbium Oxide
Author(s) -
Dole Stephen L.,
Hunter Orville
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb10033.x
Subject(s) - terbium , praseodymium , materials science , oxide , elastic modulus , thermal expansion , zirconium , crystallite , porosity , annealing (glass) , stoichiometry , sintering , analytical chemistry (journal) , composite material , mineralogy , metallurgy , chemistry , luminescence , optoelectronics , chromatography
Elastic moduli of polycrystalline HfO 2 and ZrO 2 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 HfO 2 compositions. All compositions exhibited obvious stoichiometric changes resulting from oxidation‐reduction annealing, but only the Tb 4 O 7 ‐stabilized ZrO 2 showed any significant effect of oxidation state on the modulus values; this effect was very pronounced.