Compositional dependence of properties of SnO-P2O5 glasses

Abstract

Binary SnO-P2O5 (SP) glasses with 52-72 SnO mol% were examined. Glass transition temperature, density, refractive index and absorption edge were studied for transparent SP glasses. The structure of SP glasses was evaluated by FT/IR and Raman spectroscopy. The water durability was investigated by weight loss and Raman spectroscopy for SP glass samples immersed in distilled water at 30-70°C. Raman spectra indicated in the immersion test that Q 1 units form and Q 2 units decrease as a result of water attack upon the phosphate chains with increasing immersion time in 62SnO·38P2O5 glass and no structural change was observed in 72SnO·28P2O5 glass. The relationship between the properties and glass structure with chemical bonding is discussed.

Unique thermal conductivity, Young’s modulus and local structure of 72SnO–28P₂O₅ glass

“…(100 ¹ x)P 2 O 5 glasses tends to decrease with increasing SnO content, 8) meaning that the force constant of SnO bonds is much smaller than that of PO bonds. Indeed, as reported by Cha et al 8) and Lim et al, 9) the intensity of the bands at the low frequency side in xSnO. (100 ¹ x)P 2 O 5 glasses increases with increasing SnO content.…”

Compositional effect on structural and spectroscopic properties of P2O5–SnO–MnO ternary glass system

“…Here, on this change of the phosphate network, no particular difference between SnO and MnO were identified from the Raman spectra, thus implying their similar structural roles. It is known that Sn resides in general as an Sn 2+ state, and that the Sn-O-P bonds replace the P-O-P bonds in a SnO-P 2 O 5 binary system [8,29]. Zotov et al [22] also reported that Mn can be in its 2+, 3+ or 4+ state, resulting in a coordination number of 5.7 ± 0.4 within the metaphosphate glass, which indicates mixed coordination states between 4 and 6.…”

“…For example, their low softening temperature allows them to be used to develop Pb-free sealing materials based on phosphate glasses [6,7]. Some phosphate glasses containing BaO, CaO, SnO or ZnO have been proposed as replacements for the Pb-rich glasses that show a low glass transition temperature and a high thermal expansion coefficient [8][9][10][11]. On the other hand, phosphate glasses incorporating transition metal oxides are known to be semiconducting, which promises potential applications as electrical materials [12][13][14].…”

“…Among the various transition metal oxides that can be accommodated well with P 2 O 5 , a MnO-P 2 O 5 system forms a stable amorphous state, and is also known to have further increased electrical conductivity [12]. It is also known that the binary phosphate system, i.e., SnO-P 2 O 5 , exhibits good electrical conductivity [8]. We notice that a ternary phosphate system in SnO-MnO-P 2 O 5 compositions may feature some interesting electrical and optical characteristics.…”

Rare-Earth Recovery from Soda Lime Silicate Glass Cullet by P2O5 Addition

“…With phosphate addition, the glass cullet might experimentally approach a phosphosilicate glass system. We then exploited the chemical behavior of phosphate in the silicate network matrix, i.e., its high ionic field strength [12] to attract the rare-earth element, its tendency to form discrete anion complexes [13,14] to cluster the rare-earth element away from the silicate, and its low durability [15,16] to leach phosphate with rare-earth element using water. To study the effect of phosphate addition on rare-earth element, photoluminescence spectroscopy can be employed to record the emission spectra of the element, especially in glass samples lacking transparency.…”