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ANALYSIS OF STRUCTURE AD CHEMICAL ORDER I A TERNARY Yb12Mg52Cd36 QUASICRYSTAL
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Division of Applied Physics, Graduate School of Engeneering, Hokkaido University, Sapporo, 060-8628, JAPAN.
National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, JAPAN.
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, JAPAN.
2010 (English)In: Philosophical Magazine, Sapporo, 2010Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The atomic structure of the ternary Yb12Mg52Cd36 quasicrystal has been refined from single crystal X-ray data. The ternary quasicrystal is related to the binary i-Yb16Cd84 parent phase,[1, 2] and suffers from chemical disorder mainly due to mixing between Mg and Cd. Studies on related ternary approximants however indicate that this chemical disorder is only partial, and that there are strong selection rules in several ternary systems that govern the choice of a particular atom at a specific site. The purpose of this work is thus to elucidate the chemical order between the constituent elements in the ternary Yb12Mg52Cd36 quasicrystal and its relation to ternary approximants in other REMg-Cd (RE=Rare Earth) systems. The structure refinements performed on the Yb12Mg52Cd36 quasicrystal clearly indicate that it is composed of similar atomic clusters as the binary i-Yb16Cd84 phase and that there is a strong selection rule that mainly determines the chemical order at the cluster level. Similar observations have also been made in related ternary approximant phases. The structure refinement is the first of its kind performed on a ternary Yb-Cd-related quasicrystal, and the results indicate that the structures and chemical order of ternary quasicrystals can be understood by extracting and combining information from structure refinements on both quasicrystals and related approximants.

Place, publisher, year, edition, pages
Sapporo, 2010.
National Category
Materials Chemistry Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-337776OAI: oai:DiVA.org:uu-337776DiVA, id: diva2:1171199
Conference
11th International Conference on Quasicrystals
Funder
Swedish Research CouncilAvailable from: 2018-01-05 Created: 2018-01-05 Last updated: 2018-01-05

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Gómez, Cesar Pay

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