scholarly journals Glass formation and chemical durability of chromium oxide-containing phosphate glasses.

1986 ◽  
Vol 35 (389) ◽  
pp. 133-137 ◽  
Author(s):  
Naohiro SOGA ◽  
Katsuhisa TANAKA ◽  
Rikuo OTA
Keyword(s):  
Chromium Oxide ◽  
Glass Formation ◽  
Chemical Durability ◽  
Phosphate Glasses

Preparation of Calcium Phosphate Glasses Containing Nb2O5 and TiO2

2018 ◽  
Vol 782 ◽  
pp. 47-52
Author(s):  
Patrícia Suemi Sato ◽  
Hirotaka Maeda ◽  
Akiko Obata ◽  
Toshihiro Kasuga
Keyword(s):  
Controlled Release ◽  
Calcium Phosphate ◽  
Calcium Titanate ◽  
Chemical Durability ◽  
Phosphate Glasses ◽  
Dissolution Test ◽  
Buffer Solution ◽  
High Chemical ◽  
Positive Effects ◽  
Tris Buffer Solution

60CaO-30P2O5-(10 ̶ x)Nb2O5-xTiO2 (x = 0 ~ 10, mol%) glasses were prepared in order to obtain biomaterials with high chemical durability and therapeutic ions releasability. Dissolution test of these glasses using Tris buffer solution showed the controlled release of niobate ions from Nb2O5-containing glasses and the formation of calcium titanate in some of them. These behavior might induce positive effects for bone regeneration.

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.

Nitrogen/Oxygen Substitution within PO4 Tetrahedra: A Right Answer to the Poor Chemical Durability of Phosphate Glasses

1998 ◽  
Vol 547 ◽  
Author(s):  
A. Le Sauze ◽  
L. Montagne ◽  
G. Palavit ◽  
R. Marchand
Keyword(s):  
Window Glass ◽  
Soda Lime ◽  
Chemical Durability ◽  
Phosphate Glasses ◽  
Processing Temperature ◽  
Melting Temperatures ◽  
Thermal Expansion Coefficients ◽  
Glass Processing ◽  
Alumina Addition ◽  
Oxygen Substitution

AbstractBy using both alumina addition and nitrogen/oxygen substitution within PO4 tetrahedra, it is possible to prepare durable phosphate glasses without affecting their specific properties such as low melting temperatures and high thermal expansion coefficients. In particular, “LiKMgAlPON” nitrogen-rich glass compositions have a chemical durability on the same order as soda lime window glass, associated with a glass processing temperature as low as 800°C.

Glass formation and structure of calcium antimony phosphate glasses and those doped with tellurium oxide

2017 ◽  
Vol 123 (3) ◽  
Author(s):  
Jun Li ◽  
Yin Zhang ◽  
Shangjiu Nian ◽  
Zhenning Wu ◽  
Weijing Cao ◽  
...  
Keyword(s):  
Glass Formation ◽  
Phosphate Glasses ◽  
Tellurium Oxide ◽  
Antimony Phosphate

Properties Investigation of Yb3+-Doped Phosphate Glasses for Fiber Laser

2013 ◽  
Vol 573 ◽  
pp. 31-35
Author(s):  
His Wen Yang ◽  
Jin Ming Zhu ◽  
Yu Xiang Tsai ◽  
Chun Hsiung Lin ◽  
Cheng Hsing Hsu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fluorescence Spectra ◽  
Coefficient Of Thermal Expansion ◽  
Fluorescence Emission ◽  
Softening Temperature ◽  
Chemical Durability ◽  
Phosphate Glasses ◽  
Content Increase ◽  
Glass Softening ◽  
Bridge Oxygen

The physical and optical properties of P2O5-Al2O3-ZnO glasses doped with different concentration of Yb3+ions were investigated. The experimental results indicated that density, chemical durability, glass transition temperature (Tg) and glass softening temperature (Td) of glasses increase with increasing the Yb2O3content of glasses. However, the coefficient of thermal expansion (α) for glasses decrease with increasing the Yb2O3content. From the results of Fourier transform infrared spectroscopy, the numbers of (-P-O-P-) bonds decrease and (-P-O-M+-) bonds increase with increasing the Yb2O3content. Increase of non-bridge oxygen (-P-O-M+-) raise the refractive index of glasses. Moreover, the results of absorption spectra indicate that the absorption peak of glasses are observed at both wavelengths of 916nm and 977nm. As increasing the concentration of Yb2O3, the absorption efficiencies become stronger. In accordance with the results of fluorescence spectra, the fluorescence emission of glasses are detected at wavelengths of 970nm, 995nm, 1020nm and 1048nm, respectively. The intensity of the fluorescence emission peaks significantly decrease at wavelengths of 970nm and 995nm as the concentration of Yb2O3increases. However, the intensity of the fluorescence emission peaks significantly increase at wavelength of 1048nm under the same condition.

scholarly journals Elaboration and characterization of new phosphate glasses based on natural phosphate and red clay: influence of the chemical composition on the chemical durability

2019 ◽  
Vol 9 (3) ◽  
pp. 222-235 ◽  
Author(s):  
Oumaima Jamal Eddine ◽  
Mehdi El Bouchti ◽  
Omar Cherkaoui ◽  
Hassan Hannache ◽  
Said Gmouh
Keyword(s):  
Chemical Composition ◽  
Structural Investigation ◽  
Fluorescence Analysis ◽  
Chemical Durability ◽  
Phosphate Glasses ◽  
Red Clay ◽  
Natural Phosphate ◽  
X Ray ◽  
Quenching Method

New phosphate glass formulations based on Moroccan natural phosphate minerals alone or with Moroccan red clay additive (containing the P2O5-SiO2-CaO-Al2O3-MgO-Fe2O3-K2O-Na2O-TiO2 complex) have been successfully prepared by the quenching method. The chemical composition of each of the elaborated phosphate glasses was determined by X-ray fluorescence analysis (XRF). These investigated phosphate glasses have an excellent homogeneity as was verified by SEM. Their amorphous behavior was confirmed by XRD and DSC. The increase in density and glass transition temperature due to the addition of clay is believed to be related to the crosslinking of the phosphate chains. Structural investigation of these phosphate glasses was carried out using FTIR and Raman spectroscopies. The results obtained show that the composition of these glasses contains a mixture of ultraphosphate and polyphosphate structural units. The concentrations of this mixture depending on the initial composition of the glass components. A correlation between the chemical composition and the chemical durability of the investigated glasses was studied. The results showed that the dissolution rate of the glasses decreases by increasing the clay composition up to a point. This can be explained by assuming the formation of oxygen bridges and strong bonds within the various glasses.

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