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Surface Modification in Polycrystalline Y 2 O 3 Under High‐Pressure/High‐Temperature Processing Conditions
Author(s) -
AlSharab Jafar F.,
Deutsch Stuart,
Nordahl Christopher S.,
Tse Stephen D.,
Kear Bernard H.
Publication year - 2013
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/jace.12245
Subject(s) - crystallite , materials science , monoclinic crystal system , grain size , surface layer , phase (matter) , layer (electronics) , mineralogy , crystallography , composite material , crystal structure , chemistry , metallurgy , organic chemistry
A pressure‐induced phase transformation is used to refine the grain size of polycrystalline Y 2 O 3 , by a factor of 3000. A surface modification effect accompanies the observed grain refinement, which becomes more apparent with increasing holding time under high pressure. The surface‐modified layer exhibits lower hardness and lower oxygen content relative to the underlying material. Moreover, it possesses columnar‐grained structure with cubic symmetry, whereas the interior has a monoclinic structure.