scholarly journals Thermal properties of Na2O–P2O5–Fe2O3 polyphosphate glasses

2020 ◽  
Vol 142 (1) ◽  
pp. 203-209 ◽  
Author(s):  
Paweł Goj ◽  
Małgorzata Ciecińska ◽  
Magdalena Szumera ◽  
Paweł Stoch
Keyword(s):  
Thermal Properties ◽  
Phosphate Glass ◽  
Transformation Temperature ◽  
Glass Network ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Continuous Change ◽  
Glass Transformation ◽  
Immobilization Techniques ◽  
Iron Phosphate Glasses

Abstract Iron phosphate glasses are materials that can have many applications like durable matrixes in waste immobilization techniques, biomaterials, optoelectronic devices, etc. Their possible usage is related to their glass network and thermal properties. The influence of Na2O content on thermal properties and crystallization ability of iron phosphate glass of base composition 30 Fe2O3–70 P2O5 mol% were studied. Increasing the content of Na2O causes a decrease in transformation temperature and increase in ΔCp. Characteristic temperatures, thermal stability and crystallizing phases were determined. Increasing content of sodium causes depolarization of iron phosphate glass network which causes a continuous change in ΔCp and glass transformation temperature. Discontinuous change in some glass properties suggests structure rebuilding about 30 mol% of Na2O.

scholarly journals Thermal properties and crystallization of iron phosphate glasses containing up to 25wt% additions of Si-, Al-, Na- and U-oxides

2008 ◽  
Vol 354 (14) ◽  
pp. 1541-1548 ◽  
Author(s):  
Diego O. Russo ◽  
Diego S. Rodríguez ◽  
Jesús Ma. Rincón L. ◽  
Maximina Romero ◽  
Carlos J.R. González Oliver
Keyword(s):  
Thermal Properties ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Iron Phosphate Glasses

Effects of Calcium Oxide Addition on the Structure and Thermal Properties of Iron Phosphate Glasses

2014 ◽  
Vol 48 (3) ◽  
pp. 184-189 ◽  
Author(s):  
Haijian Li ◽  
Cuiling Wang ◽  
Huijun Yu ◽  
Xiaofeng Liang ◽  
Shiyuan Yang
Keyword(s):  
Thermal Properties ◽  
Calcium Oxide ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Oxide Addition ◽  
Iron Phosphate Glasses

FTIR spectra and thermal properties of TiO2-doped iron phosphate glasses

2015 ◽  
Vol 1081 ◽  
pp. 187-192 ◽  
Author(s):  
Mingwei Lu ◽  
Fu Wang ◽  
Qilong Liao ◽  
Kuiru Chen ◽  
Jianfa Qin ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Ftir Spectra ◽  
Iron Phosphate Glasses

scholarly journals Polaronic Conductivity in Iron Phosphate Glasses Containing B2O3

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2505
Author(s):  
Luka Pavić ◽  
Stjepko Fazinić ◽  
Hüseyin Ertap ◽  
Mevlüt Karabulut ◽  
Andrea Moguš-Milanković ◽  
...  
Keyword(s):  
Master Curve ◽  
Structural Changes ◽  
Strong Dependence ◽  
Glass Structure ◽  
Glass Network ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Nominal Composition ◽  
Number Density ◽  
Iron Phosphate Glasses

We report on the electrical properties of glasses with nominal composition xB2O3–(100 − x)[40Fe2O3–60P2O5],x = 2–20, mol.%. The conduction transport in these glasses is polaronic and shows a strong dependence on Fe2O3 content and polaron number density. The changes in DC conductivity are found not to be directly related to B2O3, however structural changes induced by its addition impact frequency-dependent conductivity. All glasses obey Summerfield and Sidebottom procedures of scaling conductivity spectra indicating that the polaronic mechanism does not change with temperature. An attempt to produce a super-master curve revealed that shape of the conductivity dispersion is the same for glasses with up to 15.0 mol.% B2O3 but differs for glass with the highest B2O3 content. This result could be related to the presence of borate units in the glass network. Moreover, the spatial extent of localized polaron motions increases with the decrease of polaron number density, however, this increase shows a larger slope than for previously reported iron phosphate glasses most probably due to the influence of B2O3 on glass structure and formation of polarons. While Summerfield scaling procedure fails, Sidebottom scaling yields a super-master curve, which indicates that polaronic hopping lengths also change with changing polaron number density in these glasses.

scholarly journals Development of a New Sr-O Parameterization to Describe the Influence of SrO on Iron-Phosphate Glass Structural Properties Using Molecular Dynamics Simulations

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4326
Author(s):  
Pawel Goj ◽  
Aleksandra Wajda ◽  
Pawel Stoch
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Interatomic Potential ◽  
Glass Structure ◽  
Ion Pairs ◽  
Glass Network ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Potential Applications ◽  
Dynamics Simulations

Iron-phosphate glasses, due to their properties, have many potential applications. One of the most promising seems to be nuclear waste immobilization. Radioactive 90Sr isotope is the main short-lived product of fission and, due to its high solubility, it can enter groundwater and pose a threat to the environment. On the other hand, Sr is an important element in hard tissue metabolic processes, and phosphate glasses containing Sr are considered bioactive. This study investigated the effect of SrO addition on a glass structure of nominal 30Fe2O3-70P2O5 chemical composition using classical molecular dynamics simulations. To describe the interaction between Sr-O ion pairs, new interatomic potential parameters of the Buckingham-type were developed and tested for crystalline compounds. The short-range structure of the simulated glasses is presented and is in agreement with previous experimental and theoretical studies. The simulations showed that an increase in SrO content in the glass led to phosphate network depolymerization. Analysis demonstrated that the non-network oxygen did not take part in the phosphate network depolymerization. Furthermore, strontium aggregation in the glass structure was observed to lead to the non-homogeneity of the glass network. It was demonstrated that Sr ions prefer to locate near to Fe(II), which may induce crystallization of strontium phosphates with divalent iron.

Speciation of sulphate ions in sodium alumino(iron)phosphate glasses

2019 ◽  
Vol 512 ◽  
pp. 81-89 ◽  
Author(s):  
S.V. Stefanovsky ◽  
O.I. Stefanovsky ◽  
I.L. Prusakov ◽  
M.I. Kadyko ◽  
A.A. Averin ◽  
...  
Keyword(s):  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Iron Phosphate Glasses
Sign in / Sign up

Export Citation Format

Share Document