Doping of iron phosphate glasses with Al2O3, SiO2 or B2O3 for improved thermal stability |
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| Affiliation: | 1. Immobilisation Science Laboratory, Department of Engineering Materials, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK;2. Materials and Engineering Research Institute, Sheffield Hallam University, Howard Street, Sheffield S1 1WB, UK;1. Nanomaterials Lab., Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt;2. Metallurgy and Material Science Tests Lab., Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt;1. Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India;2. Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India;1. UCCS UMR-CNRS 8181, Université de Lille1, Villeneuve d''Ascq, France;2. LASIR UMR-CNRS 8516, Université de Lille1, Villeneuve d''Ascq, France;1. State Key Laboratory of Environment-friendly Energy Materials, School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, PR China;2. China Building Materials Academy, Beijing, 100024, PR China;1. Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, Tamilnadu, India;2. HomiBhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, 400094, India |
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| Abstract: | The effects of doping 60 P2O5–40 Fe2O3 (mol%) glasses with 5–10 mol% SiO2, Al2O3 or B2O3 on their thermal stability, iron environments and redox were investigated. Thermal stability improved markedly with 5% dopant addition in the order Al2O3 > SiO2 > B2O3 ? base glass. Solubility of pro rata additions when melted at 1150 °C was 5–10% SiO2, <5% Al2O3, and >10% B2O3. It was possible to dissolve 5% Al2O3 by replacing Fe2O3. These additions generally had little effect on dilatometric measurements and iron environments, however the Fe2+/ΣFe redox ratio increased in the order base glass < Al2O3 < SiO2 < B2O3. This behaviour was broadly consistent with the effects of glass basicity. The increased thermal stability of these glasses may improve their suitability for applications such as waste immobilisation or sealing. |
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