Structural and Physical Properties of Iron Oxychloride Phosphate Glasses

Abstract

Glasses in the system xFeCl 3 ±10Fe 2 O 3 ±(90±x)P 2 O 5 have been prepared by the normal quenching method over a wide range of composition (x 15 up to 50 mol%). The glass structure has been investigated using IR spectral analyses which shows that the intermediate range order is affected by substitution of FeCl 3 for P 2 O 5 . Thermal expansion coefficient, glass transition temperature, density and dissolution rate in HCl were also investigated. The formation of P±O±Fe and P±Cl bonds at the expense of PO bonds is responsible for the good chemical durability of the studied glasses. Changes in other properties are interpreted in terms of the depolymerization of the glassy matrix by FeCl 3 .Y.M. Moustafa and A. El-Adawy: Structural and Physical Properties of Glasses

Electronic conductivity in zinc iron phosphate glasses

“…Because of high thermal expansion coefficient, low melting temperature and high ultra-violet transmission, phosphate glasses show several advantages over conventional silicate and borate glasses [1,2]. On the other hand, a limitation of their usefulness is a relatively poor chemical durability.…”

The influence of some transition metal ions in lead- and calcium-phosphate glasses

“…The intense central absorption line on the other hand is due to 96 Mo isotope which has the nuclear spin I = 0. These obtained data suggest that Mo 5+ ions are coordinated in these glasses with five oxygen atoms in a ligand-square pyramidal symmetry C 4v and a Mo@O double bond [6,30]. For x 6 5 mol%, there are also two weak signals at g % 6.91 and g % 4.24, due to isolated Fe 3+ ions, situated in distorted tetrahedral or octahedral-trigonal vicinity of oxygen atoms [31].…”

“…It is known from literature [6,7] that the addition of Fe 2 O 3 or CuO in phosphate glasses increases their durability by the appearance of Fe-O-P and Cu-O-P bonds.…”

A Study of Electron Paramagnetic Resonance on Copper Ions on Alkali-Alkali Earth Zinc Phosphate Glass

“…However, it has a low chemical durability; the addition of transition metal such as zinc oxide enhances its chemical durability, optical properties and decreases the melting temperature. Also adding of alkali or alkali-earth plays an important role in enhancing electrical and magnetic properties, decreasing the melting temperature and a bubble free [2,3].There are special attention on copper doped phosphate glass due to their wide range applications like solid state lasers, optical filter and super ionic conductors [5,6]. In general, copper behaves as modifier, but in some situation acts as a former in glass network.…”