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Article Navigation >  International Journal of Minerals, Metallurgy and Materials  > 2020 > Accepted Manuscript

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Research Article

Sintering of monoclinic-SrAl2Si2O8 ceramics and their immobilization of Sr

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  • Received: 3 December 2019; Revised: 28 March 2020; Accepted: 30 March 2020; Available online: 3 April 2020
  • Monoclinic SrAl2Si2O8 ceramics for the immobilization of Sr were prepared by a liquid-phase sintering method. The sintering temperature, mineral phase composition, microstructure, flexural strength, bulk density, and Sr ions leaching characteristic of SrAl2Si2O8 ceramics were investigated. A crystalline monoclinic-SrAl2Si2O8 phase was formed by liquid phase sintering at 1223 K. The introduction of four different flux agents (B2O3, CaO·2B2O3, SrO·2B2O3 and BaO·2B2O3) to the SrAl2Si2O8 ceramics not only reduced the densification temperature and decreased the volatilization of Sr during high-temperature sintering, but also impacted the mechanical properties of the ceramics. The product consistency tests showed that the leaching concentration of Sr ions in sample SAS-B with flux agents B2O3 was the lowest and the leaching concentration of Sr ions in sample SAS-B2B with flux agents BaO·2B2O3 was the highest. These results show that the leaching concentration of Sr ions depends largely on amorphous phase in the ceramics. Meanwhile, the formation of mineral analog ceramic containing Sr is an important factor to improve the immobilization of Sr.
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Sintering of monoclinic-SrAl2Si2O8 ceramics and their immobilization of Sr

  • Corresponding author:

    Ding Ren    E-mail: rending2k@scu.edu.cn

  • 1. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610065, China
  • 2. Department of Radiotherapy, Division of Radiation Physics, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
  • 3. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
    Received: 3 December 2019
    Revised: 28 March 2020
    Accepted: 30 March 2020
    Available online: 3 April 2020

Abstract: Monoclinic SrAl2Si2O8 ceramics for the immobilization of Sr were prepared by a liquid-phase sintering method. The sintering temperature, mineral phase composition, microstructure, flexural strength, bulk density, and Sr ions leaching characteristic of SrAl2Si2O8 ceramics were investigated. A crystalline monoclinic-SrAl2Si2O8 phase was formed by liquid phase sintering at 1223 K. The introduction of four different flux agents (B2O3, CaO·2B2O3, SrO·2B2O3 and BaO·2B2O3) to the SrAl2Si2O8 ceramics not only reduced the densification temperature and decreased the volatilization of Sr during high-temperature sintering, but also impacted the mechanical properties of the ceramics. The product consistency tests showed that the leaching concentration of Sr ions in sample SAS-B with flux agents B2O3 was the lowest and the leaching concentration of Sr ions in sample SAS-B2B with flux agents BaO·2B2O3 was the highest. These results show that the leaching concentration of Sr ions depends largely on amorphous phase in the ceramics. Meanwhile, the formation of mineral analog ceramic containing Sr is an important factor to improve the immobilization of Sr.

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