Polaron assisted hopping mechanism in microwave processed Nd doped second layered aurivillius SrBi2Nb2O9 ceramics

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dc.check.date2026-10-17en
dc.check.infoAccess to this article is restricted until 24 months after publication by request of the publisheren
dc.contributor.authorPritam, Anuragen
dc.contributor.funderIrish Research Councilen
dc.contributor.funderShiv Nadar Foundationen
dc.date.accessioned2024-11-13T09:18:09Z
dc.date.available2024-11-13T09:18:09Z
dc.date.issued2024-10-17en
dc.description.abstractThe polycrystalline Sr0.8Sn0.2Bi1.75Nd0.25Nb2O9 (NdSBN) was synthesized using the green synthesis microwave sintering method, which significantly reduced the processing parameters of the NdSBN ceramics. Orthorhombic crystal structure with A21am symmetry was revealed by Rietveld refinement study, whereas the doping-induced strain and crystallite size was studied using the Williamson Hall method. Crossectional SEM micrographs confirm the plate-like structure, with an average grain size of 273.7 nm. A diffuse type of phase transition was observed at 345 °C, which usually arises due to compositional fluctuations and mobile oxygen vacancies; further, the diffusiveness of the NdSBN was studied using Uchino and Nomura function, a modified version of Curie-Weiss law (CW). The frequency and temperature-dependent dielectric study of NdSBN ceramics display a Maxwell-Wagner relaxation with a high loss in a low frequency regime, possibly due to the presence of leakage current in the solid solution. Frequency dependent AC conductivity obeys Jonscher's power law, whereas DC conductivity supports polaron assisted hopping in NdSBN composition with dual activation energies of 0.55 eV and 0.75 eV, which correspond to electrons and ions, respectively. The non-Debye type relaxation mechanism in conjunction with negative temperature coefficient of resistance (NTCR) behavior was demonstrated by temperature dependent impedance spectroscopy, while modulus spectroscopy confirmed the multiple relaxation processes in NdSBN ceramics.en
dc.description.sponsorshipIrish Research Council (GOIPD/2023/1225)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationPritam, A. (2024) 'Polaron assisted hopping mechanism in microwave processed Nd doped second layered aurivillius SrBi2Nb2O9 ceramics', Ceramics International, 50(22), pp.48343-48353. https://doi.org/10.1016/j.ceramint.2024.09.184en
dc.identifier.doihttps://doi.org/10.1016/j.ceramint.2024.09.184en
dc.identifier.endpage48353en
dc.identifier.issn0272-8842en
dc.identifier.issued22en
dc.identifier.journaltitleCeramics Internationalen
dc.identifier.startpage48343en
dc.identifier.urihttps://hdl.handle.net/10468/16645
dc.identifier.volume50en
dc.language.isoenen
dc.publisherElsevier B.V.en
dc.rights© 2024, Elsevier Ltd and Techna Group S.r.l. All rights are reserved, including those for text and data mining, AI training, and similar technologies. This manuscript version is made available under the CC BY-NC-ND 4.0 license.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectRietveld refinementen
dc.subjectMaxwell-Wagner distributionen
dc.subjectCole-Cole ploten
dc.subjectPolaron hoppingen
dc.subjectActivation energyen
dc.subjectModulus spectroscopyen
dc.titlePolaron assisted hopping mechanism in microwave processed Nd doped second layered aurivillius SrBi2Nb2O9 ceramicsen
dc.typeArticle (peer-reviewed)en
oaire.citation.issue22en
oaire.citation.volume50en
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