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Structure of low-silica glasses in the K2O-Nb2O5-SiO2 system

hal.structure.identifierInternational Laboratory of Glass-Based Functional Materials
dc.contributor.authorSARKISOV P., D.
hal.structure.identifierInternational Laboratory of Glass-Based Functional Materials
hal.structure.identifierDepartment of Materials Science
dc.contributor.authorPALEARI, A.
hal.structure.identifierInternational Laboratory of Glass-Based Functional Materials
dc.contributor.authorSIGAEV, V. N.
hal.structure.identifierInternational Laboratory of Glass-Based Functional Materials
dc.contributor.authorLOTAREV, S. V.
hal.structure.identifierInternational Laboratory of Glass-Based Functional Materials
dc.contributor.authorGOLUBEV, N. V.
hal.structure.identifierInternational Laboratory of Glass-Based Functional Materials
hal.structure.identifierL.Ya. Karpov Institute of Physical Chemistry
dc.contributor.authorSTEFANOVICH, S. Yu.
hal.structure.identifierInstitut Lumière Matière [Villeurbanne] [ILM]
dc.contributor.authorCHAMPAGNON, Bernard
hal.structure.identifierInstitut Lumière Matière [Villeurbanne] [ILM]
dc.contributor.authorVOUAGNER, Dominique
hal.structure.identifierUniversité Claude Bernard Lyon 1 [UCBL]
dc.contributor.authorCOUSI, M.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorFARGIN, Evelyne
dc.date.issued2013
dc.description.abstractEnThe nanostructure and nonlinear optical properties of high-niobium glasses in the (1 − x)KNbO3-xSiO2 system with an SiO2 content x = 0.05-0.35 have been studied by small-angle neutron scattering (SANS), electron microscopy (EM), and second-optical-harmonic generation (SHG). Vitreous samples are manufactured by the methods of fast melt cooling (pressing with metal plates and quenching between rotating rolls). Glasses with x < 0.12 have been established to form a micro-inhomogeneous structure in the form of silica-enriched regions at the cooling rates used. According to SANS data, quenched glasses with x > 0.2 are homogeneous, but form a silica-enriched nanostructure after thermal treatments. At temperatures below ∼T g + 50°C, silica-enriched regions manifest a very slight tendency to grow, whereas, according to SANS and X-ray diffraction data, their chemical composition is observed to shift appreciably towards SiO2 with thermal treatment. The obtained data on an inhomogeneous structure allows us to clarify the complicated character of the previously revealed dependence T g (x). Nano-inhomogeneous transparent samples produce a weak SHG signal, which indicates the quasi-periodic modulation of the chemical composition and, correspondingly, polarizability, in the volume of glass. The nonlinear optical phase KNbO3 precipitates at later stages of crystallization, when a glass loses its transparency. In this case, the SHG signal is amplified by several orders of magnitude.
dc.language.isoen
dc.subject.enNanostructured materials
dc.subject.enNonlinear optical
dc.subject.enNiobium
dc.subject.enGlasses
dc.title.enStructure of low-silica glasses in the K2O-Nb2O5-SiO2 system
dc.typeArticle de revue
dc.identifier.doi10.1134/S0040579513010065
dc.subject.halChimie/Matériaux
bordeaux.journalTheoretical Foundations of Chemical Engineering
bordeaux.page1-9
bordeaux.volume47
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-00858827
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00858827v1
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