Chemical Durability of Borate Glasses

In the light of environmental perspective, clay minerals attract special interest because of their capability to absorb and chemically stabilize heavy metals in their structure [1, 2]. The absolute suppression of heavy element leakage from clay structures to the environment, which is obviously a strict demand, can be achieved with clay vitrification. This work is related to the influence of the addition of (0-50 wt%) of montmorillonite to a borate glass with composition of 0.33Na2O-0.67B2O3 on its structure. This influence has been studied with Raman and FT-IR spectroscopies, Archimedean density measurements, chemical durability in 90°C water and finally by studying of the ultrasonically measured elastic properties, such as Young’s and shear modulus and Poisson’s ratio, of the resultant glasses. The experimental results showed that the glass structure is predominantly comprised from tetrahedral and trigonal borate units and silicon and/or aluminium tetrahedral units. The results of density and chemical durability are fairly well correlated with structure. Higher amounts of montmorillonite lead to glasses of higher mechanical strength and chemical durability.

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The Reaction Between Borate Glass and Attacking Agents—Part III: Equilibrium pH of the Alkali Borate Glasses and Their Relationship with Chemical Durability and the Glass Composition

Transactions of the Indian Ceramic Society ◽

10.1080/0371750x.1967.10855602 ◽

1967 ◽

Vol 26 (1) ◽

pp. 155-158 ◽

Cited By ~ 2

Author(s):

C. R. Das

Keyword(s):

Borate Glass ◽

Glass Composition ◽

Chemical Durability ◽

Borate Glasses ◽

Alkali Borate Glasses

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Characterization of Some Chemical and Physical Properties of Lithium Borate Glasses Doped With CuO and/or TeO2

Journal of the chemical society of pakistan ◽

10.52568/000717/jcsp/41.01.2019 ◽

2019 ◽

Vol 41 (1) ◽

pp. 52-52

Author(s):

E M Abou Hussein E M Abou Hussein

Keyword(s):

Optical Band Gap ◽

Melting Process ◽

Chemical Durability ◽

Borate Glasses ◽

Lithium Borate ◽

Molecular Weights ◽

Dc Electrical Conductivity ◽

Before And After ◽

Uv Transmittance

Glasses used in this study are prepared economically at a relatively low melting temperature (650-750oC). Presence of alkalis such as Na2O works as a flux and enhances the melting process. A Simple comparative study between the effect of doping Cu2+ and/or Te4+ ions in lithium borate glasses before and after gamma irradiation has been discussed. Density, molar volume, optical UV transmittance, optical band gap energies, DC electrical conductivity and chemical durability of the prepared glasses are measured. It is found that doping with Cu2+ ions makes a disruption in the glassy network by increasing the number of non-bridging oxygens (NBO) forming a more open network structure. While doping with the fourfold Te4+ ions enhances the crosslinking of the glassy network giving more rigid structure since the relatively high molecular weights of Te4+ ions allow them to bond strongly with the glassy network. The last two assumptions can elucidate results obtained from the last measurements.

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Chemical durability of lithium borate glasses

Journal of Non-Crystalline Solids ◽

10.1016/0022-3093(82)90131-4 ◽

1982 ◽

Vol 49 (1-3) ◽

pp. 351-362 ◽

Cited By ~ 41

Author(s):

M.H Veléz ◽

H.L Tuller ◽

D.R Uhlmann

Keyword(s):

Chemical Durability ◽

Borate Glasses ◽

Lithium Borate

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Chemical durability of some lead borate glasses in different aqueous solutions

Communications Faculty Of Science University of Ankara Series B Chemistry and Chemical Engineering ◽

10.1501/commub_0000000401 ◽

1995 ◽

pp. 019-032

Author(s):

Z. A. EL-HADI

Keyword(s):

Aqueous Solutions ◽

Chemical Durability ◽

Borate Glasses ◽

Lead Borate ◽

Lead Borate Glasses

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Phase separation in sol gel-derived ceramic films of silica-zirconia, alumina-zirconia, and titania-zirconia system

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100170967 ◽

1994 ◽

Vol 52 ◽

pp. 646-647

Author(s):

J. Tong ◽

L. Eyring

Keyword(s):

Fracture Toughness ◽

Phase Separation ◽

Sol Gel ◽

Great Influence ◽

High Strength ◽

Chemical Durability ◽

Separation Method ◽

Toughening Mechanism ◽

Ceramic Films ◽

Zirconia Toughened Alumina

There is increasing interest in composites containing zirconia because of their high strength, fracture toughness, and its great influence on the chemical durability in glass. For the zirconia-silica system, monolithic glasses, fibers and coatings have been obtained. There is currently a great interest in designing zirconia-toughened alumina including exploration of the processing methods and the toughening mechanism.The possibility of forming nanocrystal composites by a phase separation method has been investigated in three systems: zirconia-alumina, zirconia-silica and zirconia-titania using HREM. The morphological observations initially suggest that the formation of nanocrystal composites by a phase separation method is possible in the zirconia-alumina and zirconia-silica systems, but impossible in the zirconia-titania system. The separation-produced grain size in silica-zirconia system is around 5 nm and is more uniform than that in the alumina-zirconia system in which the sizes of the small polyhedron grains are around 10 nm. In the titania-zirconia system, there is no obvious separation as was observed in die alumina-zirconia and silica-zirconia system.

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