Thermal investigation and infrared evolved gas analysis of solid trivalent lanthanide and yttrium alpha-hydroxyisobutyrates in N-2 and CO2 atmospheres

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorCaires, F. J.
dc.creatorGomes, D. J. C.
dc.creatorGigante, A. C.
dc.creatorIonashiro, Massao
dc.date2014-12-03T13:08:39Z
dc.date2016-10-25T20:08:31Z
dc.date2014-12-03T13:08:39Z
dc.date2016-10-25T20:08:31Z
dc.date2014-05-01
dc.date.accessioned2017-04-06T06:13:08Z
dc.date.available2017-04-06T06:13:08Z
dc.identifierJournal Of Analytical And Applied Pyrolysis. Amsterdam: Elsevier Science Bv, v. 107, p. 313-322, 2014.
dc.identifier0165-2370
dc.identifierhttp://hdl.handle.net/11449/111441
dc.identifierhttp://acervodigital.unesp.br/handle/11449/111441
dc.identifier10.1016/j.jaap.2014.04.001
dc.identifierWOS:000336868000040
dc.identifierhttp://dx.doi.org/10.1016/j.jaap.2014.04.001
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/922220
dc.descriptionSolid-state Ln(C4H7O3)(3)center dot nH(2)O compounds, where Ln stands for trivalent lanthanides or yttrium and C4H7O3- is alpha-hydroxyisobutyrate, have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), elemental analysis, complexometry and TG-DSC coupled to infrared spectroscopy (FTIR) were used to characterize and to study the thermal behavior of these compounds in CO2 and N-2 atmospheres. The dehydration of the compounds occurs in a single (La to Nd, Tb to Tm and Y), two (Sm and Gd) and three (Eu) steps in N-2 atmosphere and a single (La, Ce, Tb to Tm and Y), two (Pr, Nd and Gd) and three (Sm and Eu) steps in CO2 atmosphere. The final residues of the thermal decomposition in N-2 atmosphere for europium to dysprosium, ytterbium and yttrium compounds up to 1000 degrees C were the respective oxides Ln(2)O(3) (Ln = Eu, Gd, Tb, Dy, Yb,Y) while for lanthanum, cerium praseodymium, neodymium, samarium, holmium, erbium, thulium and lutetium compounds, the mass loss is still being observed up to 1000 degrees C. In CO2 atmosphere, the final residue up to 1000 degrees C for all the compounds was the respective oxides, CeO2, Tb4O7 and Ln(2)O(3) (Ln = La, Pr to Gd, Dy to Lu and Y). (C) 2014 Elsevier B.V. All rights reserved.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.languageeng
dc.publisherElsevier B.V.
dc.relationJournal of Analytical and Applied Pyrolysis
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectTrivalent lanthanides
dc.subjectalpha-Hydroxyisobutyrate
dc.subjectThermal behavior
dc.subjectCoupled thermogravimetry-infrared
dc.subjectspectroscopy
dc.titleThermal investigation and infrared evolved gas analysis of solid trivalent lanthanide and yttrium alpha-hydroxyisobutyrates in N-2 and CO2 atmospheres
dc.typeOtro


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