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 10Na 2 O-30Fe 2 O 3 - 5Cr 2 O 3 -55P 2 O 5 (mol%) was produced by melting batches of (99, 98% pure) Cr 2 O 3 , Fe 2 O 3 , Na 2 CO 3 , and (NH 4 ) 2 HPO 4 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 (PO 4 ) 3- . The chemical durabil ity of the glass was investigated by measuring the weight loss in distilled water at 90°C for 22 days.
KeywordsChemical DurabilityIR SpectroscopyScanning Electron MicroscopyPhosphate GlassesXRD
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