Abstract
Phase transitions are ubiquitous in structurally complex transition metal compounds composed of homoanionic polyhedra, including nitrides, oxides, and fluorides. The symmetry breaking that occurs across polymorphic transitions is often achieved by small atomic displacements, rendering these displacive transitions reversible. In contrast, elemental crystals, alloys, and simple minerals will exhibit reconstructive "bond-breaking" transitions. Here we show that a reconstructive transition occurs in the heteroanionic compound KNaNbOF5, owing to reorientations of the [NbOF5]2- units that trigger a reconfiguration of the cation lattice. Using a combination of synchrotron-based measurements, empirical dynamic simulations, and ab initio calculations, we report structure changes across the transition and formulate an atomistic minimum energy transition path to explain its irreversible nature. Our results indicate that multianionic compounds are likely to host reconstructive transitions that are frequently difficult to study and functionalize in simpler compounds. We anticipate that our insight into the forces that drive the transition will also lead to novel methods to control the assembly of structures in the solid state.
Original language | English (US) |
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Pages (from-to) | 11882-11889 |
Number of pages | 8 |
Journal | Journal of the American Chemical Society |
Volume | 138 |
Issue number | 36 |
DOIs | |
State | Published - Sep 14 2016 |
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
- Biochemistry
- Colloid and Surface Chemistry
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CSD 1507018: Experimental Crystal Structure Determination
Holland, M. (Contributor), Charles, N. (Contributor), Rondinelli, J. M. (Contributor) & Poeppelmeier, K. (Contributor), FIZ Karlsruhe - Leibniz Institute for Information Infrastructure, 2016
DOI: 10.25505/fiz.icsd.cc1ml5hw, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.25505/fiz.icsd.cc1ml5hw&sid=DataCite
Dataset
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CSD 1507016: Experimental Crystal Structure Determination
Holland, M. (Contributor), Charles, N. (Contributor), Rondinelli, J. M. (Contributor) & Poeppelmeier, K. (Contributor), FIZ Karlsruhe - Leibniz Institute for Information Infrastructure, 2016
DOI: 10.25505/fiz.icsd.cc1ml5ft, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.25505/fiz.icsd.cc1ml5ft&sid=DataCite
Dataset
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CSD 1507019: Experimental Crystal Structure Determination
Holland, M. (Contributor), Charles, N. (Contributor), Rondinelli, J. M. (Contributor) & Poeppelmeier, K. (Contributor), FIZ Karlsruhe - Leibniz Institute for Information Infrastructure, 2016
DOI: 10.25505/fiz.icsd.cc1ml5jx, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.25505/fiz.icsd.cc1ml5jx&sid=DataCite
Dataset