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Manipulation of polar order in the “empty” tetragonal tungsten bronzes: Ba4-xSrxDy0.671.33Nb10O30, x = 0, 0.25, 0.5, 1, 2, 3
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dc.contributor.author | Gardner, Jonathan | |
dc.contributor.author | Morrison, Finlay D. | |
dc.date.accessioned | 2016-08-16T15:30:10Z | |
dc.date.available | 2016-08-16T15:30:10Z | |
dc.date.issued | 2016-08-15 | |
dc.identifier | 245054289 | |
dc.identifier | 9e7e44cf-c323-4b7e-8630-da493940c9d6 | |
dc.identifier | 84982090983 | |
dc.identifier | 000383787400032 | |
dc.identifier.citation | Gardner , J & Morrison , F D 2016 , ' Manipulation of polar order in the “empty” tetragonal tungsten bronzes: Ba 4-x Sr x Dy 0.67 1.33 Nb 10 O 30 , x = 0, 0.25, 0.5, 1, 2, 3 ' , Applied Physics Letters , vol. 109 , no. 7 , 072901 . https://doi.org/10.1063/1.4960712 | en |
dc.identifier.issn | 0003-6951 | |
dc.identifier.other | ORCID: /0000-0002-2813-3142/work/48131856 | |
dc.identifier.other | ORCID: /0000-0002-8862-8315/work/61133152 | |
dc.identifier.uri | https://hdl.handle.net/10023/9316 | |
dc.description | JG would like to thank the EPSRC for provision of a studentship via the doctoral training grant (EP/K503162/1). | en |
dc.description.abstract | A series of “empty” tetragonal tungsten bronze (TTB) ferroelectrics, Ba4-xSrxDy0.67□1.33 Nb 10O30 (x = 0, 0.25, 0.5, 1, 2, 3; □ = vacancy), is reported. With increasing x the unit cell contracts in both the ab plane and c-axis; x ≤ 1 compounds are normal ferroelectrics (FE) with decreasing TC as x increases, while x ≥ 2 are relaxor ferroelectrics (RFE) with associated frequency dependent permittivity peaks and with similar Tm and Tf (Vogel-Fulcher freezing temperatures) values. This observation is rationalised by differing cation occupancies: for x ≤ 1, Sr2+ principally occupies the A2-site (co-occupied by Ba2+ with the A1-site occupied by Dy3+ and vacancies); for x ≥ 2 significant Sr A1-site occupation leads to the observed RFE characteristics. This FE to RFE crossover is consistent with a previously proposed TTB crystal chemical framework where both a decrease in average A-site size and concurrent increase in A1-site tolerance factor (tA1) favour destabilization of long range polar order and relaxor behaviour. The effect of increasing tA1 as a result of Sr occupancy at the A1 site is dominant in the compounds reported here. | |
dc.format.extent | 986786 | |
dc.language.iso | eng | |
dc.relation.ispartof | Applied Physics Letters | en |
dc.subject | QD Chemistry | en |
dc.subject | DAS | en |
dc.subject.lcc | QD | en |
dc.title | Manipulation of polar order in the “empty” tetragonal tungsten bronzes: Ba4-xSrxDy0.671.33Nb10O30, x = 0, 0.25, 0.5, 1, 2, 3 | en |
dc.type | Journal item | en |
dc.contributor.institution | University of St Andrews. School of Chemistry | en |
dc.contributor.institution | University of St Andrews. EaSTCHEM | en |
dc.identifier.doi | 10.1063/1.4960712 | |
dc.description.status | Peer reviewed | en |
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