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. © 2021, Pleiades Publishing, Ltd.

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