000859922 001__ 859922 000859922 005__ 20240619092116.0 000859922 0247_ $$2doi$$a10.1038/s41467-018-05033-7 000859922 0247_ $$2Handle$$a2128/21380 000859922 0247_ $$2pmid$$apmid:29976983 000859922 0247_ $$2WOS$$aWOS:000437417600006 000859922 0247_ $$2altmetric$$aaltmetric:45251177 000859922 037__ $$aFZJ-2019-00738 000859922 082__ $$a500 000859922 1001_ $$0P:(DE-HGF)0$$aTrump, B. A.$$b0 000859922 245__ $$aUniversal geometric frustration in pyrochlores 000859922 260__ $$a[London]$$bNature Publishing Group UK$$c2018 000859922 3367_ $$2DRIVER$$aarticle 000859922 3367_ $$2DataCite$$aOutput Types/Journal article 000859922 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1548422091_32364 000859922 3367_ $$2BibTeX$$aARTICLE 000859922 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000859922 3367_ $$00$$2EndNote$$aJournal Article 000859922 520__ $$aMaterials with the pyrochlore/fluorite structure have diverse technological applications, from magnetism to nuclear waste disposal. Here we report the observation of structural instability present in the pyrochlores A2Zr2O6Oʹ (A = Pr, La) and Yb2Ti2O6Oʹ, that exists despite ideal stoichiometry, ideal cation-ordering, the absence of lone pair effects, and a lack of magnetic order. Though these materials appear to have good long-range order, local structure probes find displacements, of the order of 0.01 nm, within the pyrochlore framework. The pattern of displacements of the A2Oʹ sublattice mimics the entropically-driven fluxional motions characteristic of and well-known in the silica mineral β-cristobalite. The universality of such displacements within the pyrochlore structure adds to the known structural diversity and explains the extreme sensitivity to composition found in quantum spin ices and the lack of ferroelectric behavior in pyrochlores. 000859922 536__ $$0G:(DE-HGF)POF3-551$$a551 - Functional Macromolecules and Complexes (POF3-551)$$cPOF3-551$$fPOF III$$x0 000859922 536__ $$0G:(DE-HGF)POF3-6G4$$a6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)$$cPOF3-623$$fPOF III$$x1 000859922 536__ $$0G:(DE-HGF)POF3-6215$$a6215 - Soft Matter, Health and Life Sciences (POF3-621)$$cPOF3-621$$fPOF III$$x2 000859922 588__ $$aDataset connected to CrossRef 000859922 7001_ $$0P:(DE-HGF)0$$aKoohpayeh, S. M.$$b1 000859922 7001_ $$0P:(DE-HGF)0$$aLivi, K. J. T.$$b2 000859922 7001_ $$0P:(DE-HGF)0$$aWen, J.-J.$$b3 000859922 7001_ $$0P:(DE-HGF)0$$aArpino, K. E.$$b4 000859922 7001_ $$0P:(DE-HGF)0$$aRamasse, Q. M.$$b5 000859922 7001_ $$0P:(DE-HGF)0$$aBrydson, R.$$b6 000859922 7001_ $$0P:(DE-Juel1)169262$$aFeygenson, M.$$b7 000859922 7001_ $$0P:(DE-HGF)0$$aTakeda, H.$$b8 000859922 7001_ $$0P:(DE-HGF)0$$aTakigawa, M.$$b9 000859922 7001_ $$0P:(DE-HGF)0$$aKimura, K.$$b10 000859922 7001_ $$00000-0001-9134-659X$$aNakatsuji, S.$$b11 000859922 7001_ $$0P:(DE-HGF)0$$aBroholm, C. L.$$b12 000859922 7001_ $$0P:(DE-HGF)0$$aMcQueen, T. 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