Structural studies of NaPO₃–WO₃glasses by solid state NMR and Raman spectroscopy

Short and Medium Range Order in Ion-Conducting Glasses Studied by Modern Solid State NMR Techniques

“…Alloying NaPO 3 glass with MoO 3 glasses produces a well-defined maximum in the glass transition temperature near the equimolar composition whereas the effect of TeO 2 is only minor in comparison. The structural organization of (NaPO 3 ) 1−x (MoO 3 ) x and (NaPO 3 ) 1−x (WO 3 ) x glasses has been discussed on the basis of extensive multinuclear NMR and Raman spectroscopic investigations [80,89,90]. Similar structural trends have been found, which will be discussed here at the example of the (NaPO 3 ) 1−x (MoO 3 ) x system [90].…”

Spectral editing based on scalar spin–spin interactions: New results on the structure of metathiophosphate glasses

“…In the present paper we demonstrate that this task can be accomplished on the basis of indirect spin-spin (J-) couplings available by the application of two-dimensional NMR methods. As a matter of fact, J-based methods, such as homonuclear J-resolved [10] and INADE-QUATE [11] spectroscopies have been applied to various crystalline phosphates and a number of phosphate glasses in the past, giving useful information about both peak assignments and site connectivities [12][13][14][15][16][17][18]. To the best of our knowledge, however, no such applications to thiophosphate glasses have been reported and hence the structural picture in these systems remains unclear to the present date.…”

Nanohardness examination of cesium tungstophosphate glasses

“…In the glass PO 4 tetrahedron can share terminal oxygens with up to three PO 4 groups, remaining terminal oxygens can be shared with 1-4 WO 6 groups. Presence of PO 4 tetrahedra having zero, one and two P-O-P linkages and appearance of W-O-W bridges for glasses of with x < 0.7 has been confirmed by solid state NMR and Raman spectroscopy for related systems, such as x(NaPO 3 )(1 − x)(WO 3 ) [10]. Besides, the changes in the Young's modulus and hardness can be associated with decrease of total specific energy of covalent bonds, caused by the increase of cesium content in the glasses.…”