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Microcracking of Monoclinic HfO 2
Author(s) -
DOLE S. L.,
HUNTER O.,
CALDERWOOD F. W.,
BRAY D. J.
Publication year - 1978
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.1151-2916.1978.tb16123.x
Subject(s) - materials science , temperature cycling , thermal expansion , monoclinic crystal system , composite material , cracking , hysteresis , thermal , elasticity (physics) , elastic modulus , thermal hysteresis , cycling , annealing (glass) , thermodynamics , crystallography , crystal structure , chemistry , condensed matter physics , physics , phase transition , history , archaeology
Elasticity, internal friction, and thermal expansion were measured at temperatures up to 1500°C to characterize the micro‐cracking behavior of HfO 2 . Crack‐free HfO 2 showed consistent, typical changes in these properties with temperature. Micro‐cracked HfO 2 showed hysteresis in the elastic moduli and thermal expansion on thermal cycling. Internal friction increased with microcrack healing. Repeated thermal cycling and high‐temperature anneals markedly changed the microcrack system and a time‐ and atmosphere‐dependent aging effect in microcrack formation was noted.