Formation of alpha/beta-Si(3)N(4 )nanoparticles by carbothermal reduction and nitridation of geopolymers

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dc.contributor.authorBağcı, Cengiz
dc.contributor.authorYang, Qun
dc.contributor.authorKriven, Waltraud M.
dc.date.accessioned2021-11-01T15:02:05Z
dc.date.available2021-11-01T15:02:05Z
dc.date.issued2019
dc.departmentHitit Üniversitesi, Mühendislik Fakültesi, Metalurji ve Malzeme Mühendisliği Bölümü
dc.description.abstractSilicon nitride (Si3N4) particles with various alpha/beta-Si(3)N(4 )ratios were fabricated from geopolymer (GP)-carbon compositions (M2O center dot Al2O3 center dot 4.5SiO(2)center dot 12H(2)O+18C), where M is an alkali ion (Na+, K+ and Cs+). They were made by carbothermal reduction and nitridation at 1400 degrees, 1500 degrees, and 1600 degrees C for 2 hours under flowing nitrogen. Characterization of carbothermally reacted GP-carbon compositions was based on XRD, SEM-EDS, HRTEM, and selected area electron diffraction analyses. Depending on the alkaline composition of GP, the carbon content and the reaction temperature, a compositionally variable alpha/beta-Si3N4 or SiAlON was achieved. Crystallization of the GPs gradually increased by heat treatment over 1400 degrees C with corresponding weight loss. It was found that NaGP, KGP, and CsGP crystallized into a major phase of alpha-Si3N4, beta-Si3N4, and SiAlON, respectively. Prolonged heating at 1600 degrees C led to an increase in the alpha/beta-Si3N4 ratio in NaGP due to the formation of aluminum nitride, while it led to a decrease in alpha/beta-Si3N4 ratio in KGP. In the case of CsGP, SiAlON replaced the pollucite which mainly formed at lower temperatures. Transmission electron microscopy revealed that the needle-like particles were of ~0.5 mu m in size and consisting of alpha/beta-Si3N4 mixtures.
dc.identifier.citationBagci, C., Yang, Q., & Kriven, W. M. (2019). Formation of ?/??Si3N4 nanoparticles by carbothermal reduction and nitridation of geopolymers. Journal of the American Ceramic Society, 102(11), 6542-6551.
dc.identifier.doi10.1111/jace.16545
dc.identifier.endpage6551en_US
dc.identifier.issn0002-7820
dc.identifier.issn1551-2916
dc.identifier.issue11en_US
dc.identifier.scopus2-s2.0-85066466709
dc.identifier.scopusqualityQ1
dc.identifier.startpage6542en_US
dc.identifier.urihttps://doi.org/10.1111/jace.16545
dc.identifier.urihttps://hdl.handle.net/11491/6838
dc.identifier.volume102en_US
dc.identifier.wosWOS:000484534300019
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorBağcı, Cengiz
dc.language.isoen
dc.publisherWiley
dc.relation.ispartofJournal Of The American Ceramic Society
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectGeopolymersen_US
dc.subjectNanoparticlesen_US
dc.subjectNitridesen_US
dc.subjectSynthesisen_US
dc.titleFormation of alpha/beta-Si(3)N(4 )nanoparticles by carbothermal reduction and nitridation of geopolymers
dc.typeArticle

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