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Comparison of thermal expansion and heat capacity properties of various borosilicate glass-bonded strontium chloroapatite composites loaded with simulated pyrochemical waste

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Abstract

Four different glass compositions were used to encapsulate strontium chloroapatite (SrApCl) ceramics along with 10 mass/% simulated chloride waste to fabricate glass-bonded composites for nuclear waste immobilization applications. The glass compositions chosen were borosilicate glass (BSG), aluminoborosilicate glass (AlBSG), barium borosilicate glass (BaBSG) and lead borosilicate glass (PbBSG). The composites were fabricated by heat-treating the reaction mixtures at 1,073 K in air. The Products were characterised by powder XRD. The % linear thermal expansion of these composites was measured by dilatometry. The average thermal expansion coefficients (α av) of these composites were found to be in the range of 14.5 ± 0.29 × 10−6–16.4 ± 0.32 × 10−6 K−1 at 323–715 K range of measurement. The glass transition temperature (T g) of the glass–ceramic composites were also measured by dilatometry. T g and heat capacity (C p) of SrApCl-10w20BSG, SrApCl-10w20AlBSG, SrApCl-10w20BaBSG and SrApCl-10w20PbBSG were also measured by differential scanning calorimetry (DSC), and the values obtained are 730 ± 22, 718 ± 21, 700 ± 20 and 700 ± 20 K, respectively. The C p values for SrApCl-10w20BSG, SrApCl-10w20AlBSG, SrApCl-10w20BaBSG and SrApCl-10w20PbBSG are 0.57 ± 0.006, 0.60 ± 0.006, 0.52 ± 0.005 and 0.54 ± 0.005 J K−1 g−1, respectively.

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Acknowledgements

The authors are very much thankful to Dr. P. R. Vasudeva Rao, Director Chemistry Group and Director IGCAR for his support and constant encouragement. The authors thank Mr. Abhiram Senapati for recording the DSC data on these samples.

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Authors and Affiliations

  1. Materials Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    Binoy Kumar Maji, Hrudananda Jena, R. Asuvathraman & K. V. Govindan Kutty

  2. Fuel Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    R. Venkata Krishnan & K. Ananthasivan

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  1. Binoy Kumar Maji
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  2. Hrudananda Jena
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  3. R. Venkata Krishnan
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  4. R. Asuvathraman
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  5. K. Ananthasivan
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  6. K. V. Govindan Kutty
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Correspondence to Hrudananda Jena.

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Maji, B.K., Jena, H., Krishnan, R.V. et al. Comparison of thermal expansion and heat capacity properties of various borosilicate glass-bonded strontium chloroapatite composites loaded with simulated pyrochemical waste. J Therm Anal Calorim 119, 1825–1831 (2015). https://doi.org/10.1007/s10973-014-4322-1

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