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dc.contributor.authorShijina, K.
dc.contributor.authorSankar, S.
dc.contributor.authorMidhun, M.
dc.contributor.authorFirozkhan, M.
dc.contributor.authorNair, Balagopal
dc.contributor.authorWarrier, K.
dc.contributor.authorHareesh, U.
dc.date.accessioned2017-01-30T12:36:49Z
dc.date.available2017-01-30T12:36:49Z
dc.date.created2016-11-21T19:30:23Z
dc.date.issued2016
dc.identifier.citationShijina, K. and Sankar, S. and Midhun, M. and Firozkhan, M. and Nair, B. and Warrier, K. and Hareesh, U. 2016. Very low thermal conductivity in lanthanum phosphate-zirconia ceramic nanocomposites processed using a precipitation-peptization synthetic approach. New Journal of Chemistry. 40 (6): pp. 5333-5337.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/23347
dc.identifier.doi10.1039/c5nj03290c
dc.description.abstract

A wet chemical synthetic approach involving precipitation-peptization mechanisms was successfully adopted for the development of LaPO4-ZrO2 nanocomposites with the ZrO2 content varying in the 5-20 wt% range. Stoichiometric lanthanum phosphate, formed as nanofibrils during the precipitation reaction with orthophosphoric acid, was subsequently transformed into nanorods of ~10 nm width and <100 nm length upon peptization at pH 2. Zirconia dispersions were homogeneously incorporated as ultrafine particulates through zirconium oxychloride hydrolysis using ammonia. The nanocomposite precursor thus obtained could be densified to >98% TD for the LaPO4-10 wt% ZrO2 composition upon sintering at 1600 °C. The addition of ZrO2 to LaPO4 impeded densification and grain growth inhibition of up to 50% was obtained for LaPO4-20 wt% ZrO2 nanocomposites. Furthermore, the nanocomposites indicated very low thermal conductivity values (1 W m-1 K-1) compared to single phase LaPO4. The non-reactivity of LaPO4 and ZrO2 at high temperatures and the low thermal conductivity values of LaPO4-ZrO2 render them effective for high temperature thermal insulation applications. © 2016 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

dc.publisherRoyal Society of Chemistry
dc.titleVery low thermal conductivity in lanthanum phosphate-zirconia ceramic nanocomposites processed using a precipitation-peptization synthetic approach
dc.typeJournal Article
dcterms.source.volume40
dcterms.source.number6
dcterms.source.startPage5333
dcterms.source.endPage5337
dcterms.source.issn1144-0546
dcterms.source.titleNew Journal of Chemistry
curtin.departmentNanochemistry Research Institute
curtin.accessStatusOpen access


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