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An investigation of (100-x)[0.5PbO-0.2B2O3-0.3P2O5]-xMoO3 glasses
Authors: Rösslerová Ivana | Koudelka Ladislav | Holubová Jana | Mošner Petr | Montagne Lionel | Revel Bertrand
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B
Page from-to: 1-7
Titles:
Language Name Abstract Keywords
cze Studium skel (100-x)[0.5PbO-0.2B2O3-0.3P2O5]-xMoO3 Olovnatá borofosfátová skla o složení (100-x)[0.5PbO-0.2B2O3-0.3P2O5]-xMoO3 with 0-70 mol% MoO3 byla připravena a studována. Termické vlastnosti byly studovány pomocí DTA a dilatometrie. Teplota skelné transformace těchto skel klesá s růstem obsahu MoO3 ze 467 na 342°C v koncetračním rozsahu x = 0-70. Struktura skel byla studována pomocí 31 P a 11B MAS NMR a Ramanovy spektroscopie. Při nízkém obsahu MoO3 a B2O3, převažují ve struktuře skla tetrahedické celky BO4 units. Při vyšších obsazích B2O3 a MoO3 dochází též k tvorbě BO3 celků. Tvorba směsných celků BO4 s vazbami B-O-P, B-O-Mo a B-O-B má za následek vznik několika blízkých rezonancí v NMR spektrech 11B z nichž lze rozkladem spekter získat zastoupení jednotlichých strukturních celků ve studovaných sklech. proportion of borate structural units can be obtained borofosfátová skla; Ramanova spektra; NMR spektra
eng An investigation of (100-x)[0.5PbO-0.2B2O3-0.3P2O5]-xMoO3 glasses Lead borophosphate glasses of the composition (100-x)[0.5PbO-0.2B2O3-0.3P2O5]-xMoO3 with 0-70 mol% MoO3 were prepared and studied. Thermal studies were carried out with DTA and dilatometry. The glass transition temperature in these glass series decreases steadily with increasing MoO3 content from 467 to 342°C within the range of x = 0-70. The glass structure was studied by 31 P and 11B MAS NMR and by Raman spectroscopy. These studies were devoted to the investigation of changes in boron coordination in the dependence on changes of MoO3 content and of the B2O3/P2O5 ratio. When the molybdenum oxide and boron oxide content is low, tetrahedral BO4 units prevail in the structural network. With higher B2O3 content as well as with higher MoO3 content, trigonal BO3 groups are also formed. 11B MAS NMR spectra of BO4 units in the glasses with a low boron content reveal two symmetrical signals of BO4 units, ascribed to B(OP)3O and B(OP)2O2 units with B-O-P and B(4)-O-B(4) bonds. In the 11B spectra of glasses with a higher B2O3 and MoO3, the number of B(OP)3O units decreases and some B(OP)O3 units appear as well. The formation of mixed BO4 units with B-O-P, B-O-Mo and B-O-B bonds results in several close resonances from which the relative proportion of borate structural units can be obtained. The effect of changing B2O3/P2O5 ratio on the structure of lead borophosphate glasses modified with MoO3 is also discussed. glasses; borophosphate; Raman spectra; NMR spectra

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