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Vogel-Fulcher analysis of relaxor dielectrics with the tetragonal tungsten bronze structure : Ba6MNb9O30 (M = Ga, Sc, In)
Item metadata
dc.contributor.author | Rotaru, Andrei | |
dc.contributor.author | Morrison, Finlay D. | |
dc.date.accessioned | 2016-01-31T00:11:47Z | |
dc.date.available | 2016-01-31T00:11:47Z | |
dc.date.issued | 2015-05 | |
dc.identifier | 161518868 | |
dc.identifier | 452e40e1-4bd6-46b1-b28e-47839d0643a1 | |
dc.identifier | 84939946626 | |
dc.identifier | 000352480800021 | |
dc.identifier.citation | Rotaru , A & Morrison , F D 2015 , ' Vogel-Fulcher analysis of relaxor dielectrics with the tetragonal tungsten bronze structure : Ba 6 MNb 9 O 30 (M = Ga, Sc, In) ' , Journal of Thermal Analysis and Calorimetry , vol. 120 , no. 2 , pp. 1249-1259 . https://doi.org/10.1007/s10973-014-4355-5 | en |
dc.identifier.issn | 1388-6150 | |
dc.identifier.other | ORCID: /0000-0002-2813-3142/work/48131863 | |
dc.identifier.uri | https://hdl.handle.net/10023/8101 | |
dc.description.abstract | In-depth analysis of the relaxor behaviour of Ba6MNb9O30 (M= Ga, Sc, In) tetragonal tungsten bronze (TTB) ceramics was carried out. Powder x-ray diffraction and scanning electron microscopy were performed in order to confirm the formation of desired phases and to determine the microstructure. Low-temperature dielectric spectroscopy was used in order to characterise the dielectric properties of these materials; the degree of relaxor behaviour were investigated in relation with the increase of ionic radius of the M-cation on the B-site of the TTB structure. The dynamics of dielectric relaxation of dipoles was studied by fitting the dielectric permittivity data to the Vogel-Fulcher (VF) model in order to monitor the reproducibility and validity of the physical results. Restrictions to the VF fit were attempted besides the regular “free-fit” by constraining some of the fundamental relaxation parameters to physically sensible values. We show that Vogel-Fulcher fits are very sensitive to the fitting range resulting in a large range of fundamental parameters for the dielectric relaxation processes, and that the restriction of the frequency domain due to experimental noise or to instrumentation limits has a dramatic influence on the values obtained. | |
dc.format.extent | 2189124 | |
dc.language.iso | eng | |
dc.relation.ispartof | Journal of Thermal Analysis and Calorimetry | en |
dc.subject | Canonical relaxors | en |
dc.subject | Low temperature dielectric spectroscopy | en |
dc.subject | Dipolar relaxation | en |
dc.subject | Electroceramics | en |
dc.subject | Tetragonal tungsten bronzes | en |
dc.subject | Vogel-Fulcher model | en |
dc.subject | QD Chemistry | en |
dc.subject | NDAS | en |
dc.subject.lcc | QD | en |
dc.title | Vogel-Fulcher analysis of relaxor dielectrics with the tetragonal tungsten bronze structure : Ba6MNb9O30 (M = Ga, Sc, In) | en |
dc.type | Journal article | en |
dc.contributor.sponsor | The Royal Society | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.sponsor | The Royal Society | en |
dc.contributor.institution | University of St Andrews. School of Chemistry | en |
dc.contributor.institution | University of St Andrews. EaSTCHEM | en |
dc.identifier.doi | 10.1007/s10973-014-4355-5 | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2016-01-31 | |
dc.identifier.grantnumber | 516002.K5799/je | en |
dc.identifier.grantnumber | EP/F004133/1 | en |
dc.identifier.grantnumber | UF041268 | en |
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