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Electron microscopy study of intragranular nanoporosity and the occurrence of local structural disorder in cubic BaTiO_3 nanopowders from alkoxide–hydroxide precipitation process

Electron microscopy study of intragranular nanoporosity ...

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dc.contributor.author Stawski, Tomasz M. pl
dc.contributor.author Veldhuis, Sjoerd A. pl
dc.contributor.author Göbel, Ole F. pl
dc.contributor.author Proniewicz, Edyta [SAP11017634] pl
dc.contributor.author Elshof, Johan E. ten pl
dc.date.accessioned 2015-02-19T08:03:57Z
dc.date.available 2015-02-19T08:03:57Z
dc.date.issued 2012 pl
dc.identifier.issn 0272-8842 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/3197
dc.language eng pl
dc.title Electron microscopy study of intragranular nanoporosity and the occurrence of local structural disorder in cubic BaTiO_3 nanopowders from alkoxide–hydroxide precipitation process pl
dc.type JournalArticle pl
dc.description.physical 6911-6917 pl
dc.description.additional Na publikacji autorka Proniewicz Edyta podpisana jako Podstawka‐Proniewicz Edyta. pl
dc.abstract.en The evolution of phase and defect structure in BaTiO 3 nanopowders synthesized by an alkoxide–hydroxide process in benzyl alcohol under reflux conditions were investigated. As-prepared powders were heat-processed at temperatures ranging from 250 to 850 1 C. X-ray powder diffraction (XRD) showed that BaTiO 3 remained cubic with crystallite size below 30 nm after heat treatment up to 850 1 C. Internal pores of 1–2 nm diameter inside the crystallites were well visible with transmission electron microscopy (TEM) at processing temperatures between 250 and 600 1 C. Their presence was confirmed by infrared spectroscopy (FT-IR) and is attributed to accumulation and curing of lattice hydroxyl defects. No tetragonal phase was detected by XRD up to 700 1 C. However, Raman spectroscopy (FT-RS) revealed Raman activity in all cubic materials. This was attributed to local tetragonal and orthorhombic distortions, resulting from the presence of internal nanopores. Considering that the nanopores constitute a relatively large fraction of the total volume of the nanocrystals, the internal strain may be substantial. Hence, a relatively high temperature is necessary not only to cure the hydroxyl defects, but also to release the internal strains accumulated in the crystals upon volume diffusion and sintering. Therefore, the cubic-to- tetragonal phase transition was observed only after heat treatment at 850 1 C, when the occurrence of a tetragonal phase was accompanied by substantial grain growth to 100 nm size pl
dc.subject.en defects pl
dc.subject.en porosity pl
dc.subject.en electron spectroscopy pl
dc.subject.en barium titanate pl
dc.description.volume 38 pl
dc.description.number 8 pl
dc.identifier.doi 10.1016/j.ceramint.2012.05.017 pl
dc.identifier.eissn 1873-3956 pl
dc.title.journal Ceramics International pl
dc.language.container eng pl
dc.affiliation Wydział Chemii : Zakład Chemii Fizycznej i Elektrochemii pl
dc.subtype Article pl
dc.rights.original bez licencji pl
.pointsMNiSW [2012 A]: 40


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