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Solid solubility of uranium in Ca-phosphate glass and its impact on heat capacity and Tg of the glass matrix

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Abstract

Calcium phosphate glasses (CPG) with varying concentrations of uranium were synthesized by melt quench method. Maximum solid solubility of uranium in CPG was determined by using X-ray diffraction technique. Heat capacity (Cp) of the pristine CPG and uranium-loaded CPG was measured by drop calorimetry and differential scanning calorimetry. Heat capacity measured by drop calorimetry of pristine glass (CPG) was found to be 0.74 Jg−1 K−1at 298 K; on loading 0.8 mol% of uranium oxide, Cp value decreased to 0.58 Jg−1 K−1 and further higher loading of 2 mol% uranium oxide shows further reduction of Cp to 0.55 Jg−1 K−1. This decrease in Cp may be due to the weakening of glass network structure as uranium loading increases into glass matrix. Ratio of the number of bridging to non-bridging oxygen is decreasing gradually on increasing the amount of uranium in glass. The same has been observed for the DSC measurement as well; where the pristine glass (CPG) has higher heat capacity values compared to CPG-0.8 and CPG-2. In case of DSC, CPG-0.8 shows slightly lower values of heat capacity compared to CPG-2, this may be due to the structural changes by which the bonding between the atoms may slightly increase while going to higher amount of waste constituents. Glass transition temperature (Tg) of the glass matrices has been measured and it shows gradual increase on loading uranium in glass matrix from 0.8 to 6 mol%.

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Authors and Affiliations

  1. Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai-400094, India

    Hrudananda Jena, N. Praveena & Abhiram Senapati

  2. Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    Hrudananda Jena

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  1. Hrudananda Jena
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  3. Abhiram Senapati
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Jena, H., Praveena, N. & Senapati, A. Solid solubility of uranium in Ca-phosphate glass and its impact on heat capacity and Tg of the glass matrix. J Therm Anal Calorim 148, 3213–3219 (2023). https://doi.org/10.1007/s10973-023-11947-2

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  • DOI: https://doi.org/10.1007/s10973-023-11947-2

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