TITLE:
Study of Sodium-Chromium-Iron-Phosphate Glass by XRD, IR, Chemical Durability and SEM
AUTHORS:
Youssef Makhkhas, Said Aqdim, El Hassan Sayouty
KEYWORDS:
Chemical Durability; IR Spectroscopy; Scanning Electron Microscopy; Phosphate Glasses; XRD
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.1 No.3,
July
29,
2013
ABSTRACT: Chromium iron phosphate glass was investigated for use as waste form because of its improved chemical durability. The introduction of chromium in sodium-iron-phosphate glass is used to compare its effect with iron in inhibition of corrosion. The sodium-chromium-iron phosphate glass of composition 10Na2O-30Fe2O3-5Cr2O3-55P2O5 (mol%) was produced by melting batches of (99, 98% pure) Cr2O3, Fe2O3, Na2CO3, and (NH4)2HPO4 at 1080°C for one hour and pouring the liquid into steel mold. The sample was annealed at 680°C for 48 h. We have performed the measurement of X-Ray Diffraction (XRD), Scanning Electronic Microscopy (SEM), Infra-Red spectroscopy (IR), and the chemical durability. The IR of the glass studied, contains two dominant bands, which were characteristic of pyrophosphate groups, (P-O) stretching mode of P-O non bridging oxygen at 1055 cm-1 and sym stretching mode of bridging oxygen at444 cm-1 respectively. There is also a band at603 cm-1 attributed to isolated tetrahedral units (PO4)3-. The chemical durability of the glass was investigated by measuring the weight loss in distilled water at 90°C for 22 days.