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A-site size effect in a family of unfilled ferroelectric tetragonal tungsten bronzes : Ba4R0.67Nb10O30 (R = La, Nd, Sm, Gd, Dy and Y)
Item metadata
dc.contributor.author | Gardner, Jonathan | |
dc.contributor.author | Morrison, Finlay D. | |
dc.date.accessioned | 2014-08-27T09:01:04Z | |
dc.date.available | 2014-08-27T09:01:04Z | |
dc.date.issued | 2014-08-14 | |
dc.identifier | 132276440 | |
dc.identifier | 2b8e1ccc-74a8-4acd-b96a-09d17491ec73 | |
dc.identifier | 84904135951 | |
dc.identifier | 000339538300029 | |
dc.identifier.citation | Gardner , J & Morrison , F D 2014 , ' A-site size effect in a family of unfilled ferroelectric tetragonal tungsten bronzes : Ba 4 R 0.67 Nb 10 O 30 (R = La, Nd, Sm, Gd, Dy and Y) ' , Dalton Transactions , vol. 43 , no. 30 , pp. 11687-11695 . https://doi.org/10.1039/c4dt00126e | en |
dc.identifier.issn | 1477-9226 | |
dc.identifier.other | ORCID: /0000-0002-2813-3142/work/48131890 | |
dc.identifier.other | ORCID: /0000-0002-8862-8315/work/61133153 | |
dc.identifier.uri | https://hdl.handle.net/10023/5243 | |
dc.description | JG acknowledges the EPSRC and EaStCHEM for provision of a studentship via the doctoral training grant. | en |
dc.description.abstract | The effect of A-cation size on the structural and electrical properties in a family of ferroelectric tetragonal tungsten bronzes (TTBs) Ba4R0.67□1.33Nb10O30 (R = La, Nd, Sm, Gd, Dy and Y; □ = vacancy) was investigated. In each case, the crystal structure, as determined from lab-based ambient powder X-ray diffraction (PXRD), is metrically tetragonal and can be refined in the P4bm space group. XRD data show an increased splitting of hk0 00l reflections with decreasing R cation size indicating an increasing tetragonal distortion (measured by tetragonality c/a). Dielectric data and ferroelectric measurements indicate that the ferroelectric Curie temperature, TC, increases with decreasing R size and so a direct correlation between TC and tetragonality/ionic radius of R is demonstrated. Rietveld refinements show that the large A2-site is fully occupied by Ba2+ and, in addition to the R cation size, the presence of vacancies at the A1-site (perovskite-like site) is also shown to strongly affect the stability of ferroelectricity in this structure type. | |
dc.format.extent | 9 | |
dc.format.extent | 3176971 | |
dc.language.iso | eng | |
dc.relation.ispartof | Dalton Transactions | en |
dc.subject | QD Chemistry | en |
dc.subject | BDC | en |
dc.subject.lcc | QD | en |
dc.title | A-site size effect in a family of unfilled ferroelectric tetragonal tungsten bronzes : Ba4R0.67Nb10O30 (R = La, Nd, Sm, Gd, Dy and Y) | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. School of Chemistry | en |
dc.contributor.institution | University of St Andrews. EaSTCHEM | en |
dc.identifier.doi | 10.1039/c4dt00126e | |
dc.description.status | Peer reviewed | en |
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