Characterization and structural investigation of lead borophosphate glasses modified by tungsten oxide

Show simple item record Koudelka, Ladislav cze Roesslerova, Ivana cze Kalenda, Petr cze Mošner, Petr cze Montagne, Lionel cze Revel, Bertrand cze 2017-05-11T11:08:51Z 2017-05-11T11:08:51Z 2016 eng
dc.identifier.issn 0925-8388 eng
dc.description.abstract The effect of WO3 on the properties and structure of PbO-B2O3-P2O5-WO3 quaternary system was studied. Glasses containing up to 60 mol% WO3 were prepared and the variation of several physical properties was determined with respect to chemical composition in a broad compositional range. Chemical durability of WO3-containing glasses is very high and their thermal stability as well. Glass transition temperature increases with increasing WO3 content up to 566°C. Glass structure was studied by Raman spectroscopy and 31P and 11B MAS NMR spectroscopy. NMR spectroscopy reveals the formation of B-O-W linkages and also the existence of tetrahedral BO4 units and trigonal units BO3 in the glass structure. With increasing WO3 content in the glasses, the number of starting tetrahedral B(OP)3O units decreases and B-O-P bridges are replaced gradually by B-O-W and B-O-B bridges, while the number of BO3 units increases. Raman spectra of the studied glasses possess a doublet of strong vibrational bands in the range at 800-1000 cm-1, assigned to vibrations of W-O- a W=O bonds in tungstate structural units. In glasses with a higher WO3 content WO6 octahedra form tungstate clusters interconnected by W-O-W bridges as reflected in the Raman spectra.. The formation of strong P-O-W and B-O-W linkages in the studied glasses explains high chemical durability of the glasses and the observed increase in the glass transition temperature. eng
dc.format p. 377-384 eng
dc.language.iso eng eng
dc.relation.ispartof Journal of Alloys and Compounds, volume 658, issue: February eng
dc.rights práce není přístupná eng
dc.subject Structural investigation eng
dc.subject borophosphate glasses eng
dc.subject tungsten oxide, NMR spectra eng
dc.subject Raman spectra eng
dc.subject Studium struktury cze
dc.subject borofosfátová cze
dc.subject skla cze
dc.subject oxid wolframový, NMR spektra cze
dc.subject Ramanova spektra cze
dc.title Characterization and structural investigation of lead borophosphate glasses modified by tungsten oxide eng
dc.title.alternative Studium struktury a charakterizace borofosfátových skel olovnatých cze
dc.type article eng
dc.description.abstract-translated Byl studován vliv WO3 na vlastnosti a strukturu skel systému PbO-B2O3-P2O5-WO3. Byla připravena skla s obsahem až 60 mol.% WO3 a byly stanoveny změny řady fyzikálních vlastností na složení skel v širokém rozsahu složení. Teplota skelné transformace roste s obsahem WO3 až na 566°C. Struktura skel byla studována Ramanovouz spektroskopií and MAS NMR spektroskopií jader 31P a 11B. NMR spectroskopie ukázala na tvorbu vazeb B-O-W a též existenci of tetraedrický celků BO4 trigonálních celků BO3 ve strukturní síti skel. in the glass structure. S růstem obsahu WO3 počet celků B(OP)3O klesá a můstky B-O-P jsou nahrazovány celky B-O-W a B-O-B, přičemž počet celků BO3 roste. Tvorba silných vazeb P-O-W a B-O-W je příčinou vysoké chemické odolnosti skel a růstu teploty skelné treansformace. cze
dc.peerreviewed yes eng
dc.publicationstatus published version eng
dc.identifier.doi 10.1016/j.jallcom.2015.10.229 eng
dc.project.ID GA13-00355S/Vícesložková fosforečnanová a borofosforečnanová skla eng
dc.identifier.wos 000366940100049 eng
dc.identifier.scopus 2-s2.0-84946771829
dc.identifier.obd 39877176 eng

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