Intralamellar structural modifications related to the proton exchanging in K4Nb6O17 layered phase

Show simple item record

dc.contributor.author Bizeto, M. A. [UNIFESP]
dc.contributor.author Leroux, F.
dc.contributor.author Shiguihara, A. L.
dc.contributor.author Temperini, M. L. A.
dc.contributor.author Sala, O.
dc.contributor.author Constantino, V. R. L.
dc.date.accessioned 2016-01-24T13:59:31Z
dc.date.available 2016-01-24T13:59:31Z
dc.date.issued 2010-04-01
dc.identifier http://dx.doi.org/10.1016/j.jpcs.2009.12.036
dc.identifier.citation Journal of Physics and Chemistry of Solids. Oxford: Pergamon-Elsevier B.V., v. 71, n. 4, p. 560-564, 2010.
dc.identifier.issn 0022-3697
dc.identifier.uri http://repositorio.unifesp.br/handle/11600/32420
dc.description.abstract Basic structural aspects about the layered hexaniobate of K4Nb6O17 composition and its proton-exchanged form were investigated mainly by spectroscopic techniques. Raman spectra of hydrous K4Nb6O17 and H2K2Nb6O17 center dot H2O show significant modifications in the 950-800 cm(-1) region (Nb-O stretching mode of highly distorted NbO6 octahedra). the band at 900 cm(-1) shifts to 940 cm(-1) after the replacement of K+ ion by proton. Raman spectra of the original materials and the related deuterated samples are similar suggesting that no isotopic effect occurs. Major modifications were observed when H2K2Nb6O17 was dehydrated: the relative intensity of the band at 940 cm(-1) decreases and new bands seems to be present at about 860-890 cm(-1). the H+ ions should be shielded by the hydration sphere what preclude the interaction with the layers. Removing the water molecules, H+ ions can establish a strong interaction with oxygen atoms, decreasing the bond order of Nb-O linkage. X-ray absorption near edge structure studies performed at Nb K-edge indicate that the niobium coordination number and oxidation state remain identical after the replacement of potassium by proton. From the refinement of the fine structure, it appears that the Nb-Nb coordination shell is divided into two main contributions of about 0.33 and 0.39 nm, and interestingly the population, i.e., the number of backscattering atoms is inversed between the two hexaniobate materials. 2009 Elsevier B.V. All rights reserved. en
dc.format.extent 560-564
dc.language.iso eng
dc.publisher Elsevier B.V.
dc.relation.ispartof Journal of Physics and Chemistry of Solids
dc.rights Acesso restrito
dc.subject Inorganic compounds en
dc.subject Raman spectroscopy en
dc.title Intralamellar structural modifications related to the proton exchanging in K4Nb6O17 layered phase en
dc.type Artigo
dc.rights.license http://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.contributor.institution Univ Clermont Ferrand
dc.contributor.institution Universidade Federal de São Paulo (UNIFESP)
dc.contributor.institution Universidade de São Paulo (USP)
dc.description.affiliation Univ Clermont Ferrand, CNRS, UMR 6002, Lab Mat Inorgan, F-63177 Aubiere, France
dc.description.affiliation Universidade Federal de São Paulo, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, Brazil
dc.description.affiliation Univ São Paulo, Inst Quim, BR-05508000 São Paulo, Brazil
dc.description.affiliationUnifesp Universidade Federal de São Paulo, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, Brazil
dc.identifier.doi 10.1016/j.jpcs.2009.12.036
dc.description.source Web of Science
dc.identifier.wos WOS:000277055400037



File

File Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search


Browse

Statistics

My Account