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.

Low Melting Glass Billets for Pot Furnace Glass Processing

2014 ◽  
Vol 608 ◽  
pp. 295-300
Author(s):  
Ekarat Meechoowas ◽  
Parida Jampeerung ◽  
Kanit Tapasa ◽  
Usuma Naknikham ◽  
Tepiwan Jitwatcharakomol
Keyword(s):  
Coefficient Of Thermal Expansion ◽  
Soda Lime ◽  
Silica Content ◽  
Glass Transition Point ◽  
Silica Glasses ◽  
Melting Temperatures ◽  
Melting Glass ◽  
Glass Processing ◽  
Atmosphere Temperature ◽  
O 15

Soda-lime-silica glasses were prepared by the composition range of SiO2 67-72, Na2O+K2O 15-18, CaO+MgO 5-8, BaO 2-4 and ZnO 2 in wt% for producing low melting glass billets. The billet properties were similar to commercial glasses, but higher melting ability. Respecting to thermodynamic calculation approach, the exploited heat (Hex), which was the required heat for melting the batch from atmosphere temperature to the melting temperature, was calculated in order to compare the melting ability. The results represented that glass batches with lower silica content which possessed lower Hex than batch with higher silica and consequently higher melting ability. Therefore, to reduce melting energy, silica content in batches should be as low as possible. Hexof batch with SiO2 67 wt% was 480 kWh/t, while the batch with SiO2 72 wt% was higher, namely 495 kWh/t. In addition, the glass batch with SiO2 67 wt% was completely melted at 1350°C only. Properties of billets were determined, and the coefficient of thermal expansion was 9.6 x 10-6 °C-1. The glass transition point was 535 °C, and the refractive index was approximately 1.52. The study succeeded in producing glass billets with good quality and with melting temperatures lower than 1400°C.

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.

Validation of the mechanism of nitrogen/oxygen substitution in Li–Na–Pb–P–O–N oxynitride phosphate glasses

2006 ◽  
Vol 352 (36-37) ◽  
pp. 3947-3951 ◽  
Author(s):  
F. Muñoz ◽  
L. Pascual ◽  
A. Durán ◽  
R. Berjoan ◽  
R. Marchand
Keyword(s):  
Phosphate Glasses ◽  
Oxygen Substitution

Structure and Topology of Soda-Lime Silicate Glasses: Implications for Window Glass

2014 ◽  
Vol 118 (44) ◽  
pp. 12750-12762 ◽  
Author(s):  
O. Laurent ◽  
B. Mantisi ◽  
M. Micoulaut
Keyword(s):  
Window Glass ◽  
Soda Lime ◽  
Silicate Glasses ◽  
And Topology

Reaction of NF3 and SF6 with some oxides connected with heavy-metal fluoride glass processing

1988 ◽  
Vol 3 (4) ◽  
pp. 755-760 ◽  
Author(s):  
M. M. Broer ◽  
R. M. Atkins
Keyword(s):  
Heavy Metal ◽  
Sulfur Hexafluoride ◽  
Glass Melting ◽  
Fluoride Glass ◽  
Metal Fluoride ◽  
Ir Absorption ◽  
Melting Temperatures ◽  
Glass Processing ◽  
Pure Oxide ◽  
Heavy Metal Fluoride

The fluorinating properties of NF3 and SF6 in heavy-metal fluoride glass processing were investigated between 200 and 1100 °C. Using infrared (IR) absorption spectroscopy the reactions of NF3 with ZrO2 and Al2O3 and the reactions of SF6 with ZrO2, SiO2, and Ni were studied. The reaction of NF3 with zirconia and alumina starts at 300 and 650 °C, respectively (yielding nitrogen oxides, nitrogen oxyfluoride, and presumably the metal fluorides). The reaction of SF6 and zirconia starts at 600 °C, yielding SO2F2. Sulfur hexafluoride and silica yield (above 900 °C) SiF4, SO2F2, and SOF2. Nickel and SF6 react above 700 °C yielding SF4 (and presumably NiF4). The results indicate that both gases are effective in oxide conversion at typical fluoride glass melting temperatures (800–900 °C). In addition NF3 can be used as a low-temperature fluorinating source for both oxide containing fluoride and pure oxide precursors. This offers great advantages over the use of solid NH4HF2, which is typically used and which forms an additional source of contamination.

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.

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