title: Atomic Structures of Oxygen-associated Defects in Sintered Aluminum Nitride Ceramics.
abstract: : Convergent-beam electron diffraction and Z-contrast imaging are used to study oxygen-associated defects, flat inversion domain boundaries, dislocations, and interfaces in sintered AlN ceramics. The structures of these defects are directly derived from atomic-resolution Z-contrast images. The flat inversion domain boundaries contain a single Al-O octahedral layer and have a stacking sequence of.bAaB-bAc-CaAc., where -cAb- indicates the single octahedral layer. The expansion at the flat inversion domain boundaries is measured to be 0.06 (+/-0.02) nm. The interfaces between 2H- and polytypoid-AlN are found to be also inversion domain boundaries but their stacking sequence differs from that of the flat inversion domain boundaries.
authors.affiliation: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830-6030
authors.initials: Y
authors.lastname: Yan
authors.initials: SJ
authors.lastname: Pennycook
authors.initials: M
authors.lastname: Terauchi
authors.initials: M
authors.lastname: Tanaka