Complex oxides: Intricate disorder
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
In this study, complex oxides such as pyrochlores have a myriad of potential technological applications, including as fast ion conductors and radiation-tolerant nuclear waste forms. They are also of interest for their catalytic and spin ice properties. Many of these functional properties are enabled by the atomic structure of the cation sublattices. Pyrochlores (A2B2O7) contain two different cations (A and B), typically a 3+ rare earth and a 4+ transition metal such as Hf, Zr, or Ti. The large variety of chemistries that can form pyrochlores leads to a rich space in which to search for exotic new materials. Furthermore, how cations order or disorder on their respective sublattices for a given chemical composition influences the functional properties of the oxide. For example, oxygen ionic conductivity is directly correlated with the level of cation disorder — the swapping of A and B cations1. Further, the resistance of these materials against amorphization has also been connected with the ability of the cations to disorder2, 3. These correlations between cation structure and functionality have spurred great interest in the structure of the cation sublattice under irradiation, with significant focus on the disordering mechanisms and disordered structure. Previous studies have found that, upon irradiation, pyrochlores often undergo an order-to-disorder transformation, in which the resulting structure is, from a diffraction point of view, indistinguishable from fluorite (AO2) (ref. 3). Shamblin et al. now reveal that the structure of disordered pyrochlore is more complicated than previously thought4.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1256108
- Report Number(s):
- LA-UR--16-20586
- Journal Information:
- Nature Materials, Journal Name: Nature Materials Journal Issue: 5 Vol. 15; ISSN 1476-1122
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Oxygen ion conduction and structural disorder in conductive oxides
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journal | December 1994 |
Medium-range structural order in covalent amorphous solids
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journal | December 1991 |
Atomic packing and short-to-medium-range order in metallic glasses
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journal | January 2006 |
Probing disorder in isometric pyrochlore and related complex oxides
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journal | February 2016 |
Radiation Tolerance of Complex Oxides
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journal | August 2000 |
Radiation stability of gadolinium zirconate: A waste form for plutonium disposition
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journal | December 1999 |
Intricate disorder in defect fluorite/pyrochlore: a concord of chemistry and crystallography
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journal | June 2017 |
| Combined single crystal polarized XAFS and XRD at high pressure: probing the interplay between lattice distortions and electronic order at multiple length scales in high $T_c$ cuprates | text | January 2016 |
Probing disorder in pyrochlore oxides using in situ synchrotron diffraction from levitated solids–A thermodynamic perspective
|
journal | July 2018 |
Combined single crystal polarized XAFS and XRD at high pressure: probing the interplay between lattice distortions and electronic order at multiple length scales in high T c cuprates
|
journal | July 2016 |
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