Heat-resistivity and Local Structure of New Nuclear Waste Glass Composed of Calcium Aluminate and Lead Phosphate

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  • NISHIDA Tetsuaki
    Department of Chemistry, Faculty of Science, Kyushu University
  • MAKI Keisuke
    Department of Chemistry, Faculty of Science, Kyushu University
  • SETO Motoshi
    Department of Chemistry, Faculty of Science, Kyushu University

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  • アルミン酸カルシウムとリン酸鉛により構築される新しい放射性廃棄物ガラスの耐熱性と局所構造

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Abstract

Aluminophosphate glass with a batch composition of 30 CaO⋅15 A12O3⋅5 Fe2O3⋅25 PbO⋅25 P2O5 was prepared as a potential host for the high-level nuclear wastes. This“base glass”consists of highly heat-resistant 60CaO⋅ (40-x) A12O3⋅xFe2O3 glass and water-resistant lead metaphosphate glass, Pb (PO3) 2, which is known to have -103 times higher water-resistivity than conventional borosilicate glass. Two crystallization temperatures (Tc) of 650-671 and 668-693°C were determined from the differential thermal analysis (DTA) of the“base glass”. Large activation energies of 4.2 and 4.9 eV were obtained from a Kissinger plot of the Tc values. Nuclear waste“model glass” containing 10 stable isotopes with the mass numbers of 90-100 (Sr, Y, Zr, Nb, Mo) and 135-145 (Ba, La, Ce, Pr, Nd) also shows high heat-resistivity. 57Fe Mössbauer spectrum indicates that Fe (III) and Fe (II) are ionically bonded to distorted PO4 tetrahedra at the sites of network modifier.

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 48 (5), 313-319, 1999

    Japan Radioisotope Association

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