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Three Dimensional Structure of UMo8O26: Ordering of U-Vacancies

Published online by Cambridge University Press:  01 February 2011

N.D. Zakharov  and
P. Werner
N.D. Zakharov
Affiliation:
Max-Planck Institute of Microstructure Physics, 06120 Halle, Weinberg 2, Germany
P. Werner
Affiliation:
Max-Planck Institute of Microstructure Physics, 06120 Halle, Weinberg 2, Germany
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Abstract

The structure and composition of UMo8O26 synthesized by solid state reaction method have been investigated by High Resolution Transmission Electron Microscopy (HRTEM), Selected Area Electron Diffraction, and EDX microanalysis. The ordering of U vacancies results in considerable enlargement of unit cell parameters: an=6.44 nm, bn=1.45 nm, cn=1.6 nm. It is build up of four layers piled up in c direction. Each following layer is shifted relative to previous one by vector bn/4. Eight hexagonal tunnels in each layer are filled by U atoms, while the eight others are vacant (V). Interaction between U cations and vacancies is driving force for ordering. The variation of stoichiometry can be a reason for appearance of incommensurate modulations in these crystals. It seems plausible that this structure might also exhibit superconductivity at low temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 718: Symposium D – Perovskite Materials , 2002 , D4.12
Copyright
Copyright © Materials Research Society 2002

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