Delocalized-Atom Model and Properties of Sulfophosphate Glasses

Сандитов, Д. С.; Badmaev, S. S.

doi:10.1134/s0020168519010102

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…This may be due to a gradual depolymerization of the glass network and the formation of more NBOs and short chain composed by sulfate, borate and phosphate structural units. Indeed, it was suggested that the sulfophosphate glass network is made up of relatively short -P-O-P-chains where SO 4 tetrahedra bind to such chain as terminal groups [36]. One possibility to explain the depolymerization mechanism is that SO 2− 4 ions interact with PO 4 units by forming P-O-S bonds to disconnect the phosphate network.…”

Section: Optical Band Gap and Urbach Energymentioning

confidence: 99%

Physical properties and conductivity relaxation processes in sodium sulfo-borophosphate glasses

Sadok

Saad²,

Haouari³

2019

J. Phys.: Condens. Matter

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Many physical properties of a sodium-borophosphate glass system (BPSx) having the starting composition (30H3BO3 + xNa2SO4 + (60 − 2x) NaH2PO4 + 10ZnO) were detremined. It was found that the glass density ρ, the transition temperature Tg, and the optical gap energy decrease whereas the molar volume and Urbach ▵E energy increases with the substitution of Na2O by Na2SO4. The analysis of the evolution of the complex dielectric permittivity ε* and the complex electric modulus M* with temperature and composition of the glass indicates that the dielectric loss is dominated by ionic conduction, and the relaxation processes are non-Debye type. The evolution of the Kohlrausch–Williams–Watts (KWW) exponent β, estimated from the imaginary part of the electric modulus indicates that the investigated glass behaves as an intermediate elastic system as compared to flexible and stressed rigid phase. The obtained values of the decoupling index are of the same order of magnitude as observed for fast-ion conducting glasses. From the analysis of the experimental data, we may suggest that the glass sample BPS4 is the more thermally stable and has the highest ionic conductivity since it has the highest dielectric constant favorable for the dissociation of sodium salt.

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Section: Optical Band Gap and Urbach Energymentioning

confidence: 99%

Physical properties and conductivity relaxation processes in sodium sulfo-borophosphate glasses

Sadok

Saad²,

Haouari³

2019

J. Phys.: Condens. Matter

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The Relationship between Microhardness and Glass Transition Temperature of Chalcogenide Glasses

Tver’yanovich

2022

Glass Phys Chem

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The Temperature Interval of the Liquid–Glass Transition of Amorphous Polymers and Low Molecular Weight Amorphous Substances

et al. 2023

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We present calculation results of the temperature interval δTg characterizing the liquid–glass transition in amorphous materials obtained on the basis of available data of the empirical parameters C1 and C2 in the Williams–Landel–Ferry (WLF) viscosity equation. We consider the unambiguous dependence of the relative transition temperature interval δTg/Tg on the fraction of the fluctuation volume fg frozen at the glass transition temperature Tg utilizing Sanditov’s model of delocalized atoms. The parameter f = ΔVe/V, which determines the molecular mobility characteristic of delocalized atoms in the liquid–glass transition region, is weakly dependent on the nature of most vitreous substances and can be found as fg = 1/C1. We show that the temperature interval δTg is less than 1% of the Tg for most amorphous substances. This result conforms with Simon’s classical idea of a small temperature range in which the structure freezes. The structural relaxation time τg at Tg of polymers and chalcogenide glasses is also calculated.

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Delocalized-Atom Model and Properties of Sulfophosphate Glasses

Cited by 3 publications

References 7 publications

Physical properties and conductivity relaxation processes in sodium sulfo-borophosphate glasses

Physical properties and conductivity relaxation processes in sodium sulfo-borophosphate glasses

The Relationship between Microhardness and Glass Transition Temperature of Chalcogenide Glasses

The Temperature Interval of the Liquid–Glass Transition of Amorphous Polymers and Low Molecular Weight Amorphous Substances

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