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<p>Iron phosphate based glass-ceramics with deliberately added Ce as an active nuclide simulant were prepared by microwave sintering. The sintering characteristics, including phases and structural evolution, and chemical durability were investigated. XRD showed that NaZr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> and FePO<sub>4</sub> became the main crystalline phases of glass-ceramics with increasing sintering temperature. SEM revealed the glass-ceramics compactness increased first and then decreased as sintering temperature increased. Raman spectrum showed that, as sintering temperature increased, the network structure of glass-ceramics changed from mainly containing orthophosphate and pyrophosphate to a single orthophosphate. After immersion for 28 days, <i>LR</i><sub>Na</sub>, <i>LR</i><sub>Zr</sub> and <i>LR</i><sub>Ce</sub> of the glass-ceramics prepared at 1 000 °C were as low as 3.64×10<sup>−5</sup>, 0.25×10<sup>−9</sup> and 5.70×10<sup>−9</sup> g/m<sup>2</sup>/d respectively. The results indicate that iron phosphate based glass-ceramics can be prepared by rapid microwave sintering of glass powders and there is a potential of employing such microwave sintering technique in processing of glass-ceramics nuclear waste form.</p>

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Formation of Iron Phosphate Based Glass-ceramics for Nuclear Waste Immobilization by Microwave Sintering

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Shuqing Fang,
  • Tianhe Wang,
  • Zhengyi Zhang,
  • Lifen Shi,
  • Chunjie Shi,
  • Yuhong Jiao,
  • Weiwei Wang,
  • Pingping Wang,
  • Na Han,
  • Yangshan Sun

摘要

Iron phosphate based glass-ceramics with deliberately added Ce as an active nuclide simulant were prepared by microwave sintering. The sintering characteristics, including phases and structural evolution, and chemical durability were investigated. XRD showed that NaZr2(PO4)3 and FePO4 became the main crystalline phases of glass-ceramics with increasing sintering temperature. SEM revealed the glass-ceramics compactness increased first and then decreased as sintering temperature increased. Raman spectrum showed that, as sintering temperature increased, the network structure of glass-ceramics changed from mainly containing orthophosphate and pyrophosphate to a single orthophosphate. After immersion for 28 days, LRNa, LRZr and LRCe of the glass-ceramics prepared at 1 000 °C were as low as 3.64×10−5, 0.25×10−9 and 5.70×10−9 g/m2/d respectively. The results indicate that iron phosphate based glass-ceramics can be prepared by rapid microwave sintering of glass powders and there is a potential of employing such microwave sintering technique in processing of glass-ceramics nuclear waste form.