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dc.typeArtigo de eventopt_BR
dc.titleOrganic Acids Effect On Crystallization Kinetics Of Cordierite Obtained By Diphasic Gelpt_BR
dc.contributor.authorSilva N.T.pt_BR
dc.contributor.authorBertran C.A.pt_BR
dc.contributor.authorOliveira M.A.S.pt_BR
dc.contributor.authorThim G.P.pt_BR
unicamp.authorSilva, N.T., Institute of Chemistry, UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazilpt_BR
unicamp.authorBertran, C.A., Institute of Chemistry, UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazilpt_BR, M.A.S., Department of Chemistry, ITA, São José dos Campos, SP, Brazilpt, G.P., Department of Chemistry, ITA, São José dos Campos, SP, Brazilpt
dc.description.abstractα-Cordierite (Mg2Al4Si5O18) was obtained, by a sol-gel aqueous route, from aqueous solutions containing Si:Al:Mg in a molar ratio equal to 5:2.15:2.25 and citric (Lcit samples), or oxalic (Lox samples), or tartaric acid (Ltart samples), in such amount that the molar ratio organic acid/aluminum ion was equal to 1. The effect of each organic chelating upon the quantity of crystallized α-cordierite was investigated. The influence of a heating treatment time, to eliminate the organic material from the xerogels containing citric acid, on the quantity of α-cordierite formed was also investigated. Thermal gravimetric analysis was used to investigate the thermal decomposition process of each sample. Based on thermal gravimetric results we suggest that the thermal decomposition of the Lcit, Lox and Ltart xerogels takes place in three major steps and little difference was observed for each case. X-ray diffraction (XRD) measurements were carried out to determine the crystalline phases present after heat treatment of each sample at 1000 °C. X-ray diffraction results showed that the sequence for the quantity of crystallized α-cordierite from each sample is: Lcit > Lox > Ltart. XRD results also indicate that the quantity of crystallized α-cordierite from samples containing citric acid (Lcit) increased with the time of the heating treatment used to eliminate the organic material. © 2002 Elsevier Science B.V. All rights reserved.en
dc.relation.ispartofJournal of Non-Crystalline Solidspt_BR
dc.identifier.citationJournal Of Non-crystalline Solids. , v. 304, n. 1-3, p. 31 - 35, 2002.pt_BR
dc.description.provenanceMade available in DSpace on 2015-06-30T16:45:31Z (GMT). No. of bitstreams: 1 2-s2.0-0036605136.pdf: 223349 bytes, checksum: ba6a08d59a6c329c561f92101e18e572 (MD5) Previous issue date: 2002en
dc.description.provenanceMade available in DSpace on 2015-11-26T15:37:48Z (GMT). No. of bitstreams: 2 2-s2.0-0036605136.pdf: 223349 bytes, checksum: ba6a08d59a6c329c561f92101e18e572 (MD5) 2-s2.0-0036605136.pdf.txt: 14259 bytes, checksum: d3aa96f541e1cee8232063d7f2bda814 (MD5) Previous issue date: 2002en
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