Mixed network former effects in tellurite glass systems: Structure/property correlations in the system (Na2O)1/3[(2TeO2)x(B2O3)1−x]2/3

Larink, Dirk; Eckert, Hellmut

doi:10.1016/j.jnoncrysol.2015.07.007

Cited by 15 publications

(27 citation statements)

References 44 publications

(63 reference statements)

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“…Regarding the network former connectivities, the phosphate units that can be found in these glasses can be classified as P n mTe species, where n is the number of bridging oxygen atoms and can be 0, 1, 2, or 3 and m ≤ n is the number of P−O−Te linkages. In this case, preferred heteroatomic connectivity was observed, probably linked to the presence of P 3 species, 10 and stabilizing the network by a more effective charge dispersal than in the single-network former glasses. To date, the structural implications of network former mixing in tellurite-based glasses with heavy metal oxide network modifiers have not been investigated.…”

Section: ■ Introductionmentioning

confidence: 82%

“…Thus, charge balance dictates that the concentration c(Te a ) of anionic tellurium sites (either four coordinated or three coordinated) is given by Here, only monoanionic tellurite species are being considered, as there is no spectroscopic evidence for dianionic Te 3 0 sites, which would have significantly lower shielding anisotropies than observed here. 10 In turn, the fraction of tellurium in the anionic state can be calculated from the relation…”

Section: ■ Discussionmentioning

confidence: 99%

“…As shown in previous work, the variations in the local environments observed in compositionally complex tellurite glasses result in very wide 125 Te NMR chemical shift distributions, and the resultant loss in resolution makes the use of magic angle spinning obsolete. 10,29 For this reason, recording static spectra is generally preferred, and to date, no definitive discrimination between these tellurium local environments on the basis of their 125 Te chemical shift tensor parameters is possible.…”

Section: H G S H I S a I Gmentioning

confidence: 99%

“…For example, Larink et al 10 reported a comprehensive structural study of the glass system (Na 2 O) 1/3 [(2TeO 2 ) x (P 2 O 5 ) 1−x ] 2/3 via Raman, X-ray photoelectron, and multinuclear solid-state NMR spectroscopies. In that system the network former phosphorus oxide preferentially attracts the network modifier over the network former tellurium oxide, and this preference could be quantified.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In that system the network former phosphorus oxide preferentially attracts the network modifier over the network former tellurium oxide, and this preference could be quantified. 10 Nevertheless, tellurium oxide is also modified to some extent, particularly when present in lower concentrations (x < 0.5). Regarding the network former connectivities, the phosphate units that can be found in these glasses can be classified as P n mTe species, where n is the number of bridging oxygen atoms and can be 0, 1, 2, or 3 and m ≤ n is the number of P−O−Te linkages.…”

Section: ■ Introductionmentioning

confidence: 99%

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Network Former Mixing Effects in Heavy Metal Oxide Glasses: Structural Characterization of Lead Zinc Phosphotellurite Glasses Using NMR and EPR Spectroscopies

et al. 2018

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Network former mixing effects in Yb 3+ -doped glasses in the system [(2TeO 2 ) x (P 2 O 5 ) 1−x ] 0.6 [(PbO) 0.5 -(ZnO) 0.5 ] 0.4 have been investigated using a comprehensive strategy involving complementary NMR ( 31 P, 125 Te, 207 Pb) and EPR (of Yb 3+ probe ions) spectroscopies. Phosphate local environments and connectivities are extracted from detailed 31 P MAS NMR line shape analyses with assignments to distinct P n mTe sites supported by recoupling of homonuclear spin−spin interactions (refocused-INADEQUATE experiments). These results suggest a preference for P−O−Te over P−O−P and Te−O−Te connectivities for x < 0.5, consistent with nonlinear compositional trends of glass transition temperatures. While sharing of the network modifiers PbO and ZnO between the phosphate and the tellurite networks is close to proportional, the NMR data indicate subtle deviations favoring phosphate ligation at x > 0.6, where the anionic fraction of phosphate exceeds the expected fraction (67%) based on composition. On a local scale, nonlinear trends in 207 Pb chemical shift parameters suggest the preferred formation of a ligand environment with approximately equal numbers of phosphate and tellurite ligands near x = 0.5, which persists over a wide composition range. While electron spin echo envelope modulation (ESEEM) experiments suggest that the overall elemental distribution appears to be homogeneous on a 1 nm distance scale, the EPR lineshapes suggest significant changes (and possibly inhomogeneous distributions) of the local Yb 3+ environments.

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Section: ■ Introductionmentioning

confidence: 82%

Section: ■ Discussionmentioning

confidence: 99%

Section: H G S H I S a I Gmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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