PHOTOELECTRON SPECTROSCOPY ON IRON-CONTAINING CaO–SiO₂–P₂O₅GLASS CERAMICS

Abstract

The influence of isochronous heat treatments, applied at different temperatures between 1000 and 2000 • C under the same conditions and schedules, on the elemental composition of iron-containing CaO-SiO 2 -P 2 O 5 glass ceramics was investigated by X-ray-induced photoelectron spectroscopy. Differences in the elemental composition, with the exception of the oxygen content, are observed. Major modifications are obtained for the glass ceramic resulting after the heat treatment carried out at 1000 • C. It contains the highest iron concentration on the investigated surface and has a Ca/P ratio about three times higher than the untreated sample.

Thermal stability of glasses from the Fe4(P2O7)3–Fe(PO3)3 system

“…Chemically durable iron phosphate glasses have been studied as alternative materials for vitrifying high-level nuclear waste [6][7][8][9][10]. Other iron phosphate glasses have been developed for corrosion-resistant, reinforcing fibers for composite materials [11,12].…”

Thermal properties of Na2O–P2O5–Fe2O3 polyphosphate glasses

“…They can have very high chemical durability which makes them a good candidate to be considered as materials for vitrifying dangerous waste. Due to the presence of phosphorous, they can be biocompatible and may be used as corrosion-resistant materials for bone implants [1][2][3][4][5][6][7][8].…”

Thermal stability of Na2O–FeO–Fe2O3–P2O5 glasses

“…Iron phosphate glasses with PbO have been developed for radiation shielding applications, including gamma-radiation [2,7]. Iron phosphate glasses have also been developed as biomaterials with tailored rates of degradation in aqueous environments and as corrosionresistant, reinforcing fibers for composite materials [8,9,10,11]. Phosphate glasses containing divalent iron cations exhibit interesting semiconducting properties, magneto-optical properties and magnetic transition properties [12,13,14,15,16].…”