Premium
Verification of the elastic constants for α‐Al 2 O 3 using high‐resolution neutron diffraction
Author(s) -
Kisi Erich H.,
Howard Christopher J.,
Zhang Jianfeng
Publication year - 2011
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889810049046
Subject(s) - neutron diffraction , lattice constant , diffraction , crystallite , materials science , crystallography , corundum , resolution (logic) , neutron , sign (mathematics) , single crystal , condensed matter physics , physics , optics , chemistry , nuclear physics , composite material , mathematics , mathematical analysis , artificial intelligence , computer science
Precise lattice strains measured using high‐resolution neutron diffraction from a solid polycrystalline sample are used to explore the single‐crystal elastic constants of α‐Al 2 O 3 (corundum). The analysis confirms a recent suggestion that, contrary to the long‐accepted view, the sign of s 14 should be negative. It also indicates that the magnitude of s 13 should be adjusted from −0.38 × 10 −12 to −0.47 × 10 −12 Pa −1 . It is found that, micromechanically, the polycrystal responds to stress in a manner very close to the Reuss limit. The results confirm the applicability of the diffraction method, which could prove useful when other techniques give ambiguous results.