6533b7dcfe1ef96bd1272c9d
RESEARCH PRODUCT
Atomic structure solution of the complex quasicrystal approximant Al77Rh15Ru8 from electron diffraction data
Ute KolbUte KolbLouisa MeshiShmuel SamuhaEnrico MugnaioliBenjamin Grushkosubject
ChemistryMetals and AlloysQuasicrystalCrystal structureelectron diffraction tomography; icosahedral and decagonal quasicrystals; modern direct methodsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsCrystallographyElectron diffractionmodern direct methodsMaterials ChemistryAtomic modelicosahedral and decagonal quasicrystalsPrecession electron diffractionOrthorhombic crystal systemelectron diffraction tomographyHigh-resolution transmission electron microscopyElectron backscatter diffractiondescription
The crystal structure of the novel Al77Rh15Ru8phase (which is an approximant of decagonal quasicrystals) was determined using modern direct methods (MDM) applied to automated electron diffraction tomography (ADT) data. The Al77Rh15Ru8E-phase is orthorhombic [Pbma,a= 23.40 (5),b= 16.20 (4) andc= 20.00 (5) Å] and has one of the most complicated intermetallic structures solved solely by electron diffraction methods. Its structural model consists of 78 unique atomic positions in the unit cell (19 Rh/Ru and 59 Al). Precession electron diffraction (PED) patterns and high-resolution electron microscopy (HRTEM) images were used for the validation of the proposed atomic model. The structure of the E-phase is described using hierarchical packing of polyhedra and a single type of tiling in the form of a parallelogram. Based on this description, the structure of the E-phase is compared with that of the ε6-phase formed in Al–Rh–Ru at close compositions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-01-01 |