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Design of crystal-like aperiodic solids with selective disorder–phonon coupling

DOI: 10.1038/ncomms10445 DOI Help
PMID: 26842772 PMID Help

Authors: Alistair R. Overy (University of Oxford, Diamond Light Source) , Andrew B. Cairns (University of Oxford) , Matthew J Cliffe (University of Oxford) , Arkadiy Simonov (University of Oxford) , Matthew G. Tucker (Diamond Light Source) , Andrew L Goodwin (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 7

State: Published (Approved)
Published: February 2016

Open Access Open Access

Abstract: Functional materials design normally focuses on structurally ordered systems because disorder is considered detrimental to many functional properties. Here we challenge this paradigm by showing that particular types of strongly correlated disorder can give rise to useful characteristics that are inaccessible to ordered states. A judicious combination of low-symmetry building unit and high-symmetry topological template leads to aperiodic ‘procrystalline’ solids that harbour this type of disorder. We identify key classes of procrystalline states together with their characteristic diffraction behaviour, and establish mappings onto known and target materials. The strongly correlated disorder found in these systems is associated with specific sets of modulation periodicities distributed throughout the Brillouin zone. Lattice dynamical calculations reveal selective disorder-driven phonon broadening that resembles the poorly understood ‘waterfall’ effect observed in relaxor ferroelectrics. This property of procrystalline solids suggests a mechanism by which strongly correlated topological disorder might allow independently optimized thermal and electronic transport behaviour, such as required for high-performance thermoelectrics.

Journal Keywords: Condensed matter; Materials science; Physical chemistry

Subject Areas: Chemistry, Materials

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Added On: 08/02/2016 16:45

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