title: Geometric frustration of icosahedron in metallic glasses.
abstract: Icosahedral order has been suggested as the prevalent atomic motif of supercooled liquids and metallic glasses for more than half a century, because the icosahedron is highly close-packed but is difficult to grow, owing to structure frustration and the lack of translational periodicity. By means of angstrom-beam electron diffraction of single icosahedra, we report experimental observation of local icosahedral order in metallic glasses. All the detected icosahedra were found to be distorted with partially face-centered cubic symmetry, presenting compelling evidence on geometric frustration of local icosahedral order in metallic glasses.
authors.affiliation: WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Hirata
authors.forename: L J
authors.initials: LJ
authors.lastname: Kang
authors.forename: T
authors.initials: T
authors.lastname: Fujita
authors.forename: B
authors.initials: B
authors.lastname: Klumov
authors.forename: K
authors.initials: K
authors.lastname: Matsue
authors.forename: M
authors.initials: M
authors.lastname: Kotani
authors.forename: A R
authors.initials: AR
authors.lastname: Yavari
authors.forename: M W
authors.initials: MW
authors.lastname: Chen