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Microstructural features and domain formation in (Ba,Sr) 2 TiSi 2 O 8 fresnoites

Wong, Chui Ling; Ferraris, Christiano; White, Timothy

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The formation and co-existence of crystallographically modulated and non-modulated regions in (Ba,Sr)2TiSi2O8 fresnoites is reviewed, particularly the dependence on local composition. It is shown that perturbations of the average fresnoite structure, determined from appreciable single crystals, are in some cases better described as nanometric domain intergrowths where departures from ideal stoichiometry are characteristics of incommensuration, while modulation is absent from volumes that are...[Show more]

dc.contributor.authorWong, Chui Ling
dc.contributor.authorFerraris, Christiano
dc.contributor.authorWhite, Timothy
dc.date.accessioned2015-12-10T22:30:52Z
dc.identifier.issn0022-4596
dc.identifier.urihttp://hdl.handle.net/1885/55275
dc.description.abstractThe formation and co-existence of crystallographically modulated and non-modulated regions in (Ba,Sr)2TiSi2O8 fresnoites is reviewed, particularly the dependence on local composition. It is shown that perturbations of the average fresnoite structure, determined from appreciable single crystals, are in some cases better described as nanometric domain intergrowths where departures from ideal stoichiometry are characteristics of incommensuration, while modulation is absent from volumes that are less perturbed chemically. Evidence for this differentiation is obtained from selected area electron diffraction (SAED) patterns and high-resolution transmission electron microscopy (HRTEM) images. The domains are readily distinguished by their unique contrast in bright field electron micrographs. Fourier reconstructions of HRTEM images collected from areas with darker contrast show that modulation can change within relatively small volumes. Nearby areas with lighter contrast were found by SAED to be free of structural disorder and incommensurate reflections.
dc.publisherAcademic Press
dc.sourceJournal of Solid State Chemistry
dc.subjectKeywords: (Ba,Sr)-fresnoite; Bright fields; Co-existence; Domain formation; Electron micrograph; Fourier reconstruction; Fresnoites; HRTEM images; Incommensuration; Inter-growths; Local compositions; Microstructural features; Nanometrics; Selected area electron dif (Ba,Sr)-fresnoite; Electron diffraction; Incommensuration; TEM
dc.titleMicrostructural features and domain formation in (Ba,Sr) 2 TiSi 2 O 8 fresnoites
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume184
dc.date.issued2011
local.identifier.absfor100302 - Bioprocessing, Bioproduction and Bioproducts
local.identifier.ariespublicationf5625xPUB324
local.type.statusPublished Version
local.contributor.affiliationWong, Chui Ling, Nanyang Technological University
local.contributor.affiliationFerraris, Christiano, Museum National d'Histoire Naturelle
local.contributor.affiliationWhite, Timothy, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue7
local.bibliographicCitation.startpage1768
local.bibliographicCitation.lastpage1776
local.identifier.doi10.1016/j.jssc.2011.05.009
dc.date.updated2016-02-24T09:07:08Z
local.identifier.scopusID2-s2.0-79959776681
local.identifier.thomsonID000292718500029
CollectionsANU Research Publications

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