Mechanical Loss and Conduction Mechanism in Iron-Phosphate Glass

1969 ◽  
Vol 116 (2) ◽  
pp. 254 ◽  
Author(s):  
R. A. Miller ◽  
Kent W. Hansen
Keyword(s):  
Phosphate Glass ◽  
Conduction Mechanism ◽  
Iron Phosphate ◽  
Mechanical Loss

Applicability of Iron Phosphate Glass Medium for Loading NaCl Originated From Seawater Used for Cooling the Stricken Power Reactors

2013 ◽  
Author(s):  
Hidekazu Kobayashi ◽  
Ippei Amamoto ◽  
Takuma Yokozawa ◽  
Teruo Yamashita ◽  
Takayuki Nagai ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Phosphate Glass ◽  
Glass Formation ◽  
Coefficient Of Thermal Expansion ◽  
Glass Melting ◽  
Glass Network ◽  
Iron Phosphate ◽  
Chemical Durability ◽  
Raw Material

As the part of investigation for immobilization of the sludge as one of the radioactive wastes arising from the treatment of contaminated water at Fukushima Dai-ichi nuclear power plant, applicability of vitrification method has been evaluated as a candidate technique. The aim of this study is to evaluate the influence of NaCl as one of the main constituents of sludge, on glass formation and glass properties. Two kinds of iron phosphate glass (IPG) media in the xFe2O3-(100-x)P2O5, with x = 30 and 35 (mol%) were chosen and the glass formation, structure and properties including density, coefficient of thermal expansion, glass transition temperature, onset crystallization temperature and chemical durability of NaCl-loaded IPG were studied. The results are summarized as follows. Sodium chloride, NaCl could be loaded into IPG medium as Na2O and Cl contents and their loading ratio could be up to 19 and 15 mol%, respectively. Majority of Cl content of raw material NaCl was thought to be volatilized during glass melting. Loading NaCl into IPG induces to depolymerize glass network of phosphate chains, leads to decrease both glass transition and onset crystallization temperatures, and to increase coefficient of thermal expansion. NaCl-loaded IPG indicated good chemical durability in case of using 35Fe2O3-65P2O5 medium.

Effect on the structure and stability of iron phosphate glass with Sb and Te-ion loading for nuclear waste storage application

2021 ◽  
Vol 570 ◽  
pp. 121016
Author(s):  
Akhilesh C. Joshi ◽  
Mainak Roy ◽  
Dimple P. Dutta ◽  
Raman K. Mishra ◽  
Sher Singh Meena ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
Phosphate Glass ◽  
Iron Phosphate ◽  
Nuclear Waste Storage ◽  
Structure And Stability ◽  
Waste Storage

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.

Analytical Electron Microscopy Study of Electron Radiation Damage in Iron Phosphate Glass Waste Forms

2002 ◽  
Vol 757 ◽  
Author(s):  
K. Sun ◽  
L. M. Wang ◽  
R. C. Ewing
Keyword(s):  
Electron Microscopy ◽  
Phosphate Glass ◽  
Analytical Electron Microscopy ◽  
Phase Segregation ◽  
Iron Phosphate ◽  
Microscopy Study ◽  
High Electron ◽  
Glass Waste ◽  
Waste Forms ◽  
Analytical Electron

ABSTRACTA series of iron phosphate glass waste forms with compositions of 45Fe2O3-55P2O5, 20Fe2O3-80P2O5, and 20Fe2O3-20Na2O-60P2O5, namely FeP-1, FeP-2 and FeP-3, was studied by analytical electron microscopy (AEM). Transmission electron microscopy (TEM) bright-field (BF) imaging showed that under the electron irradiation, phase segregation occurred in both the FeP-1 and FeP-2 samples at high electron doses (3.84×1026 e/m2). In contrast, bubbles formed in the FeP-3 sample, even at a relatively low dose (2.88×1025 e/m2), which may be attributed to the migration of Na under irradiation as in the case in sodium borosilicate glass. Series electron energy-loss spectroscopy (EELS) analysis showed that the glass materials experienced mass-loss and composition variation. No obvious Fe valence state changes under irradiation were observed within the irradiation period.

Removal of Fission Products in the Spent Electrolyte Using Iron Phosphate Glass as a Sorbent

2010 ◽  
Author(s):  
Ippei Amamoto ◽  
Naoki Mitamura ◽  
Tatsuya Tsuzuki ◽  
Yasushi Takasaki ◽  
Atsushi Shibayama ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Phosphate Glass ◽  
Alkali Metals ◽  
Fission Products ◽  
Iron Phosphate ◽  
Experimental Result ◽  
Filtration Method ◽  
High Level ◽  
Filtration Experiment

This study is carried out to make the pyroprocessing hold a competitive advantage from the viewpoint of environmental load reduction and economical improvement. As one of the measures to reduce the volume of the high-level radioactive waste (HLW), the phosphate conversion method is applied for removal of fission products (FP) from the melt, referring to the spent electrolyte in this paper. Among the removing target chlorides in the spent electrolyte i.e., alkali metals, alkaline earth metals and rare earth elements, only the rare earth elements and lithium form the precipitates as insoluble phosphates by reaction with Li3PO4. The sand filtration method was applied to separate FP precipitates from the spent electrolyte. The iron phosphate glass (IPG) powder, which is a compatible material for the immobilization of FP, was used as a filter medium. After filtration experiment, it was proven that insoluble FP could almost be completely removed from the spent electrolyte. Subsequently, we attempted to separate the dissolved FP from the spent electrolyte. The IPG was being used once again but this time as a sorbent instead. This is possible because the IPG has some unique characteristics, e.g., changing the valence of iron, which is one of its network modifiers due to its manufacturing temperature. Therefore, it would be likely to sorb some FP when the chemical condition of IPG is unstable. We produced three kinds of IPG under different manufacturing temperature and confirmed that those glasses could sorb FP as anticipated. According to the experimental result, its sorption efficiency of metal cations was attained at around 20–40%.

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