STRUCTURAL STUDIES, ELASTIC AND PHOTOELASTIC PROPERTIES OF LEAD PHOSPHATE, BARIUM PHOSPHATE AND LEAD BARIUM PHOSPHATE GLASSES. PDF Download
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Author: Milad Rezazadeh
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The investigation of the atomic structure of glass and its corresponding crystals not only allows us to interpret its elastic and photoelastic properties, but it also allows us to predict the properties of glass which have not been produced yet or are toxic to synthesize. In order to find a correlation between elastic and photoelastic properties with the composition and atomic structure, a series of ternary (PbO)x(BaO)50-x(P2O5)50 (x=10 to 50 mol%) as well as binary (PbO)x(P2O5)100-x (x=50 to 60 mol%) and (BaO)x(P2O5)100-x (x=50 to 55 mol%) compositions have been synthesized via traditional melt quenching techniques and their compositions were verified through wavelength-dispersive spectroscopy (WDS). The local environment of lead and phosphorus as well as the glass atomic structure were investigated with 31P and 207Pb solid-state nuclear magnetic resonance (ssNMR) spectroscopy and derived molar volume from density measurements. The longitudinal and transverse wave velocities (vL and vT ) were determined using Ultrasonic Echography Method (USE). The experimental density values along with the vL and vT were then used to calculate the elastic properties in each series of glass compositions: the longitudinal, bulk, shear, and Young's moduli as well as Poisson ratio. Refractive indices, the sign and value of stress optic coefficient (C) were measured via Abbe refractometer, PS-100 Polariscope and the Senarmont compensator method, respectively. The reliability of the empirical model of photoelasticity was tested and discussed.
Author: Milad Rezazadeh
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The investigation of the atomic structure of glass and its corresponding crystals not only allows us to interpret its elastic and photoelastic properties, but it also allows us to predict the properties of glass which have not been produced yet or are toxic to synthesize. In order to find a correlation between elastic and photoelastic properties with the composition and atomic structure, a series of ternary (PbO)x(BaO)50-x(P2O5)50 (x=10 to 50 mol%) as well as binary (PbO)x(P2O5)100-x (x=50 to 60 mol%) and (BaO)x(P2O5)100-x (x=50 to 55 mol%) compositions have been synthesized via traditional melt quenching techniques and their compositions were verified through wavelength-dispersive spectroscopy (WDS). The local environment of lead and phosphorus as well as the glass atomic structure were investigated with 31P and 207Pb solid-state nuclear magnetic resonance (ssNMR) spectroscopy and derived molar volume from density measurements. The longitudinal and transverse wave velocities (vL and vT ) were determined using Ultrasonic Echography Method (USE). The experimental density values along with the vL and vT were then used to calculate the elastic properties in each series of glass compositions: the longitudinal, bulk, shear, and Young's moduli as well as Poisson ratio. Refractive indices, the sign and value of stress optic coefficient (C) were measured via Abbe refractometer, PS-100 Polariscope and the Senarmont compensator method, respectively. The reliability of the empirical model of photoelasticity was tested and discussed.
Author: Jing Hui Ang
Publisher:
ISBN:
Category :
Languages : en
Pages : 148
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Author: S. P. Chow
Publisher:
ISBN:
Category : Electrolytes
Languages : en
Pages : 284
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Book Description
A few types of glasses over a range of composition have been synthesised namely PbO-B2O3, PbCl2-PbO-B2O3, PbO-P2O5, PbCl2-PbO-P2O5, Ag2O-P2O5, Agl-Ag2O-2B2O3 and Ag2O-2B2O3. The elastic properties (bulk modulus, Young modulus, Poisson ratio, etc.) of glasses in the lead phosphate, lead borate and silver phosphate have been measured. The ionic conductivity measurements are also done on the silver phosphate and silver borate glasses. The silver-containing glasses which are fact conducting glasses exhibit high ionic conductivity. [Authors' abstract].
Author: K. Azman
Publisher:
ISBN:
Category : Elasticity
Languages : en
Pages :
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Author: Yee San Low
Publisher:
ISBN:
Category : Elasticity
Languages : en
Pages : 166
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Author: Akiko Obata
Publisher: Royal Society of Chemistry
ISBN: 1839161647
Category : Technology & Engineering
Languages : en
Pages : 297
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Book Description
Inorganic glasses are successfully used in the biomedical field, in particular degradable glasses have found applications in tissue engineering, bone regeneration and tooth remineralisation. Silicate glasses are the most commonly used ones but phosphate and borate glasses are attracting more and more interest owing to their special properties, differing from those of silicate bio-glasses. Phosphate and borate glasses thus open up potential routes for new therapeutic applications. This book focuses on these emerging materials. Bridging the phosphate and borate glasses communities, this book provides a fundamental treatment of atomic structure and physicochemical properties before highlighting their current and potential future applications. Phosphate and borate glasses not only feature a broader range of glass formation than silicate glasses. Their ability to completely dissolve in water with the solubility varying over orders of magnitude with compositional changes, makes them exciting materials for delivering therapeutic agents into the human body. Biomaterials scientists working in glasses, hard tissue engineering and regenerative medicine will find this a must-have book to own, alongside their more traditional silicate glass tomes.
Author: Vincent Martin
Publisher:
ISBN:
Category :
Languages : en
Pages : 418
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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Lead-indium phosphate-lasses exhibit a number of useful properties such as a hi-h index-of-refraction, low preparation temperature and melt viscosity, and good chemical durability. The structure of such a glass (composition in wt.%: 65 PbO, 29 P2O5, 6 In2O3) has been investigated by total neutron scattering using the GLAD diffractometer at Argonne's spallation neutron source IPNS. Peaks corresponding to the P-0, Pb-O/ln-O, and O-O pairs were observed in the radial distribution function. The short-range structure in the -lass, in terms of average coordination numbers and bond distances, is compared with those of a pure P2O5 glass and with the crystal structure of lead pyrophosphate, Pb2P2O--. Unlike silicate glasses in which the SiO4 tetrahedra form a 3-dimensional network, the PO4 tetrahedra in phosphate glasses form a chain-like structure. The structural modification by the lead cations in phosphate glasses appears to occur mainly in the medium range-affecting, the lengths and connectivity of the chain-like structure.
Author: Said AQDIM
Publisher: Scientific Research Publishing, Inc. USA
ISBN: 1649974337
Category : Antiques & Collectibles
Languages : en
Pages : 274
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 636
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