Research Of Structure And Chemical Durability Of Ce Simulation Containing Radioactive Waste Pu On Vitrification By Iron Phosphate Glass

The iron phosphate glass （40Fe₂O₃-60P₂O₅, mol%）, called baseglass, which was found to have the low melting, low viscosity and thebest chemical durability, and it is the perfect matrix of the high-levelnuclear waste. In this work, the Ce was used analog radio-nuclides Pu,the Gd as a neutron absorber, the iron phosphate base glass（40Fe₂O₃-60P₂O₅, mol%） as matrix. The samples of the studied glasseswere investigated using X-ray diffraction（XRD）, Scanning electronmicroscopy（SEM） Raman spectroscopy, Fourier transform infraredspectroscopy（FT-IR） and Differential thermal analysis（DTA）. The loadcapacity for CeO₂, Gd₂O₃and CeO₂&Gd₂O₃, and the micro-structure,crystallization property, thermal property and chemical durability ofthe studied glasses were investigated. The results can provide sometheoretical basis for the vitrification of the radio-nuclides Pu.1. The the glass formation range of the samples forxCeO₂-（40-x）Fe₂O₃-60P₂O₅series is about x≤30mol%, and thexCeO₂-（100-x）（40Fe₂O₃-60P₂O₅） series is about x≤8mol%. Thestructure of two series cerium iron phosphate glasses which were madeup of predominantly pyrophosphate groups with a small proportion ofmetaphosphate and orthophosphate groups. The density andmicro-hardness of the cerium iron phosphate glass increased withincreasing CeO₂content, the increasing density of the sudied glass canreduce vitrification costs, microhardness shown that HLW glass has agood impact capacity.2. The the glass formation range of the samples for xGd₂O₃-（40-x）Fe₂O₃-60P₂O₅series is about x≤6mol%, and thexGd₂O₃-（100-x）（40Fe₂O₃-60P₂O₅） series is about x≤4mol%. Ramanand FT-IR data suggest that the main structure of two series glasses arethe pyrophosphate, a small amount of orthophosphate andmetaphosphate structure. The density, micro-hardness and glasstransition temperature of gadolinium iron phosphate glass sampleincrease with the increase of Gd₂O₃content, which shown that thegadolinium iron phosphate glass have bast impact resistance andthermal stability. The results of crystallization treatment forgadolinium iron phosphate glass shown that Gd were stable at a certaintemperature in the glass structure.3. The the glass formation range of the samples forx（CeO₂+Gd₂O₃）-（40-x）Fe₂O₃-60P₂O₅series is about x≤12mol%, andthe x（CeO₂+Gd₂O₃）-（100-x）（40Fe₂O₃-60P₂O₅） series is about x≤8mol%. The main structure of two series glasses are the pyrophosphate, asmall amount of orthophosphate and metaphosphate structure, Ramanand FT-IR data suggest that the cerium gadolinium iron phosphateglasses structure does not produce any fundamental change with theincreasing CeO₂and Gd₂O₃content. The density, micro-hardness andglass transition temperature of cerium gadolinium iron phosphate glassincrease with the increase of CeO₂and Gd₂O₃content. The results ofcrystallization treatment and leaching test for cerium gadolinium ironphosphate glass shown that were good resistance to crystallizationability and high chemical durability.