Mixed Alkali Effect In Phosphate Glasses

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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 Mixed Alkali Effect In Silicate And Borate Glasses

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Author : Rachel Diana Williams
language : en
Publisher:
Release Date : 1991

The Mixed Alkali Effect In Silicate And Borate Glasses written by Rachel Diana Williams and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.

The Mixed Alkali Effect In Lithium Sodium Silicate Glasses

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Author : Anthony Manuel Asseiro
language : en
Publisher:
Release Date : 1991

The Mixed Alkali Effect In Lithium Sodium Silicate Glasses written by Anthony Manuel Asseiro and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Glass 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.

Mixed Alkali Effects In Silicate Glasses

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Author : Edward William Tokarsky
language : en
Publisher:
Release Date : 1969

Mixed Alkali Effects In Silicate Glasses written by Edward William Tokarsky and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with categories.

Toward An Understanding Of The Mechanical Mixed Alkali Effect In Glasses

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Author : Costas H. Tzinis
language : en
Publisher:
Release Date : 1979

Toward An Understanding Of The Mechanical Mixed Alkali Effect In Glasses written by Costas H. Tzinis 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 mechanical properties of mixed alkali glasses have been analyzed in order to determine their common features, including systematic variations with composition, and to define clearly the phenomena that must be explained. New assignments of the mechanical loss peaks are made, and approaches to developing a cooperative theory for the phenomena, especially the compositional variation of the peak temperatures and loss tangents, are presented and discussed. (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).

The Mixed Alkali Effect In Sb2o3 Na2o Li2o Glass

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Author : Md. Rahim Sahar
language : en
Publisher:
Release Date : 1999

The Mixed Alkali Effect In Sb2o3 Na2o Li2o Glass written by Md. Rahim Sahar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Glass categories.

Alkali Depletion And Ion Beam Mixing In Glasses

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Author :
language : en
Publisher:
Release Date : 1983

Alkali Depletion And Ion Beam Mixing In Glasses written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.

Ion-implantation-induced alkali depletion in simple alkali-silicate glasses (12M2O.88SiO2) has been studied for implantations at room temperature and near 77K. Results are consistent with a mechanism for alkali removal, by heavy ion bombardment, based on radiation-enhanced migration and preferential removal of alkali from the outermost layers. Similar results were obtained for mixed-alkali glasses ((12-x)Cs2.O.xM2O.88SiO2) where, in addition, a mixed-alkali effect may also be operative. Some preliminary experiments with ion implantation through thin Al films on SiO2 glass and on a phosphate glass show that inter-diffusion takes place and suggest that this ion-mixing technique may be a useful method for altering the physical properties of glass surfaces.