Russian Journal of Inorganic Chemistry ( IF 2.1 ) Pub Date : 2021-09-21 , DOI: 10.1134/s0036023621090114 E. K. Papynov 1, 2 , O. O. Shichalin 1, 2 , A. A. Belov 1, 2 , I. Yu. Buravlev 1, 2 , A. S. Portnyagin 1, 2 , S. A. Azon 1 , A. A. Buravleva 1 , V. A. Nepomnyushchaya 1 , Z. E. Kornakova 1 , A. V. Gridasov 1 , I. G. Tananaev 1 , D. Kh. Shlyk 2 , Yu. A. Parot’kina 2 , V. I. Sergienko 2
Abstract
An efficient method was presented to perform the hydrothermal synthesis of a nanocrystalline SrWO4 powder with the scheelite structure and the spark plasma sintering (SPS) of ceramics based on it. The composition, morphology, and structure of samples under various synthesis temperature conditions were studied by X-ray powder diffraction analysis, scanning electron microscopy, and energy-dispersive spectroscopy. The efficiency of the ultrafast (several minutes long) sintering of the nanocrystalline SrWO4 powder was described by the dynamics of its consolidation as a function of the SPS time and temperature. The temperature of formation was determined for a single-phase SrWO4 ceramic with a high relative density and a low strontium leaching rate of less than 10–6 g/(cm2 day), which is in demand as matrices for the reliable immobilization of the high-energy radionuclide strontium-90. For the first time, a method was implemented to produce a sample of a SrWO4 ceramic–high-alloy steel coupled composite by SPS as a test article of an open ionizing radiation source. The method consists in the diffusion sintering of materials within a single step at 1000°C for 5 min with the mandatory use of a sintering additive in the form of a mixture of metals (70 wt % Ti + 30 wt % Ag). The results of this work showed the possibility of developing a high-tech solution for the production of high-performance radioisotope products by SPS.
中文翻译:
白钨矿结构的类矿物 SrWO4 陶瓷及其放射性同位素产物的合成
摘要
提出了一种高效的水热合成白钨矿结构纳米晶SrWO 4粉末和基于它的陶瓷放电等离子体烧结(SPS)的方法。通过X射线粉末衍射分析、扫描电子显微镜和能量色散光谱研究了不同合成温度条件下样品的组成、形貌和结构。纳米晶 SrWO 4粉末的超快(几分钟长)烧结效率通过其固结动力学描述为 SPS 时间和温度的函数。确定了具有高相对密度和小于 10 的低锶浸出率的单相 SrWO 4陶瓷的形成温度–6 g/(cm 2 day),这是可靠固定高能放射性核素锶 90 所需的基质。首次实施了一种方法,通过 SPS生产 SrWO 4陶瓷-高合金钢耦合复合材料样品,作为开放式电离辐射源的试验品。该方法包括在单个步骤中在 1000°C 下对材料进行 5 分钟的扩散烧结,强制使用金属混合物形式的烧结添加剂(70 重量%钛 + 30 重量%银)。这项工作的结果表明,有可能为 SPS 生产高性能放射性同位素产品开发高科技解决方案。