Investigation Of Mixed Alkali Glasses

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Investigation Of Mixed Alkali Glasses

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Author : S. C. Waterton
language : en
Publisher:
Release Date : 1932

Investigation Of Mixed Alkali Glasses written by S. C. Waterton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1932 with categories.

An Investigation Of The Mixed Alkali Effect In Disilicate Glasses By Spectroscopic Methods

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Author : Angeline Tiong-Whei Yap
language : en
Publisher:
Release Date : 1996

An Investigation Of The Mixed Alkali Effect In Disilicate Glasses By Spectroscopic Methods written by Angeline Tiong-Whei Yap and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.

Investigation Of A Two Step Ion Exchange In Mixed Alkali Glasses

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Author : David Gauss
language : en
Publisher:
Release Date : 2016

Investigation Of A Two Step Ion Exchange In Mixed Alkali Glasses written by David Gauss and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

Spectroscopic Investigations Of Charge Transfer Materials And Mixed Alkali Glasses

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Author : Efstratios I. Kamitsos
language : en
Publisher:
Release Date : 1984

Spectroscopic Investigations Of Charge Transfer Materials And Mixed Alkali Glasses written by Efstratios I. Kamitsos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Charge transfer devices (Electronics) categories.

Investigations Of The Conductivity Of Mixed Alkali And Alkali Lead Silicate Glasses

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Author : Keith Hugh
language : en
Publisher:
Release Date : 1966

Investigations Of The Conductivity Of Mixed Alkali And Alkali Lead Silicate Glasses written by Keith Hugh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.

Cation Environments And The Mixed Alkali Effects In Silicate Glasses

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Author : G. N. Greaves
language : en
Publisher:
Release Date : 1990

Cation Environments And The Mixed Alkali Effects In Silicate Glasses written by G. N. Greaves and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Cations categories.

Mixed Alkali Effect In Phosphate Glasses

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Author : Gurram Giridhar
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2013-01

Mixed Alkali Effect In Phosphate Glasses written by Gurram Giridhar and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-01 with categories.

Phosphate glasses have several advantages over conventional silicate and borate glasses due to their superior physical properties such as high thermal expansion coefficient, low melting and softening temperatures, and high ultraviolet transmission for different potential industrial and scientific applications. Phosphate glasses are structurally interesting because they accept a wide range of ion substitution. The PO4 tetrahedrons are linked together with covalent bonding in chains or rings by bridging oxygens. Neighboring phosphate chains are linked together by cross bonding between the metal cations and two non-bridging oxygen atoms of each PO4 tetrahedron. For the Transition Metal ions, the d orbitals are five-fold degenerate. In crystals as well as glasses, the orbital degeneracy is lifted due to the presence of surrounding ligands. This work explains the existence of mixed alkali effect by the bond nature, site symmetry of various first group transition metal ions in a vitreous Phosphate glass network.

An Investigation Of Iron Phosphate Glasses

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Author : Xiangyu Fang
language : en
Publisher:
Release Date : 2000

An Investigation Of Iron Phosphate Glasses written by Xiangyu Fang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.

"The effect of melting history on the iron redox equilibrium, structure, crystallization and properties of a binary iron phosphate glass with a 40Fe2O3-60P2O5 mol%, batch composition were investigated. The structure and properties of single and mixed alkali iron phosphate glasses were also studied. Mössbauer, Raman and infrared spectroscopy were used to determine the changes in the concentration of iron ions and phosphate units in the structure. Differential thermal analysis, X-ray diffraction and thermogravimetric analysis were used to investigate crystallization. Density, molar volume, thermal expansion, dc electrical conductivity and dielectric constant and loss tangent were measured. The heat capacity and glass transition behavior of the glasses was also measured by the differential scanning calorimeter method. The effect of the melting temperature is stronger than the melting time on the concentration of Fe2 ions in iron phosphate glasses. The pyrophosphate network in iron phosphate glasses and their general properties do not change either with melting temperature and time or with adding up to 20 mol% of single and mixed alkali oxides. The dissolution rate (in deionized water) of these glasses is generally very low (~10−9 g/cm2/min) and nearly independent of the relative concentration of Fe2 or Fe3+ ions. The dissolution rate of the iron phosphate glasses containing 20 mol% of single or mixed alkali oxide can be comparable to that of window glass. There is no mixed alkali effect in the iron phosphate glasses. The crystallization tendency indicates that the glass structure becomes closer to that of crystalline Fe3(P2O-- )2 with increasing concentration of Fe2+ ions in the glass. The large fragility parameters indicates that the iron phosphate glasses belong in the category of the fragile glass-forming liquids"--Abstract, leaf v

Comparative Raman Study Of Mixed Alkali And Similar Ion Exchanged Glasses

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Author : Charles Windisch
language : en
Publisher:
Release Date : 1979

Comparative Raman Study Of Mixed Alkali And Similar Ion Exchanged Glasses written by Charles Windisch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.

The Raman spectra of analogous ion exchanged and mixed alkali disilicate and aluminodisilicate glasses of the same relative composition of dissimilar cations have been determined and employed to investigate the origin of the similarity of the mechanical loss features exhibited by them. Ion exchange of Na+ for Li+ in Li2O-Al2O3-2SiO2 glasses is shown to yield glasses whose network structure is different from that of the mixed alkali glasses of the same stoichiometry, but to attain that structure upon annealing. The network structure of ion exchanged and conventionally mixed alkali disilicate glasses are apparently identical. These results are interpreted in light of the mechanical loss spectra of the analogous glasses prepared in the two ways. (Author).

Mixed Alkali Glass Spectra And Structure

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Author : George B. Rouse
language : en
Publisher:
Release Date : 1977

Mixed Alkali Glass Spectra And Structure written by George B. Rouse and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.

The far infrared and Raman spectra of several series of mixed alkali metaphosphate glasses have been investigated as a function of the mole fraction, x, of the network modifying ionic oxides in xM2O(1-x)M2O.P2O5. The frequencies of the cation-motion bands in the far infrared spectra, which correspond to cation-site vibrations, do not shift with x, indicating that the vibrationally significant local geometry and forces associated with a particular cation are unaffected by the introduction of the second cation into the glass structure. Each Raman-active band due to vibrations of the metaphosphate network occurs at a different frequency for each pure glass (x-0 or 1), but for mixed alkali glasses only one band occurs for each type of mode and it varies linearly with x. This indicates that the cations in these mixed alkali glasses are homogeneously distributed, there is no significant molecular-level domain formation, and the phosphate chains are associated with an averaged cation environment whose effect on the chain modes varies with x. A simple vibrational model is presented which shows that the cation-dependent shifts are due to small changes in network bond angles and variation of the cation-site forces. (Author).