Kozlovskiy Artem L, Zdorovets Maxim V, Khametova Ainagul A, Shlimas Dmitriy I
Laboratory of Solid State Physics, The Institute of Nuclear Physics, Almaty 050032, Kazakhstan.
Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Nur-Sultan 010008, Kazakhstan.
Gels. 2022 Jul 19;8(7):451. doi: 10.3390/gels8070451.
Lithium-containing ceramics have several great potential uses for tritium production, as well as its accumulation. However, their use is limited due to their poor resistance to external influences, mechanical pressure, and temperature changes. In this work, initial nanostructured ceramic powders were obtained using the sol-gel method, by mixing TiO and LiClO·3HO with the subsequent addition of NiO nanoparticles to the reaction mixture; these powders were subsequently subjected to thermal annealing at a temperature of 1000 °C for 10 h. Thermal annealing was used to initiate the phase transformation processes, and to remove structural distortions resulting from synthesis. During the study, it was found that the addition of NiO nanoparticles leads to the formation of solid solutions by a type of LiNiTiO substitution, which leads to an increase in the crystallinity and structural ordering degree. At the same time, the grain sizes of the synthesized ceramics change their shape from rhomboid to spherical. During analysis of the strength characteristics, it was found that the formation of LiNiTiO in the structure leads to an increase in hardness and crack resistance; this change is associated with dislocation. When analyzing changes in resistance to cracking, it was found that, during the formation of the LiNiTiO phase in the structure and the subsequent displacement of the LiTiO phase from the composition, the crack resistance increases by 15% and 37%, respectively, which indicates an increase in the resistance of ceramics to cracking and the formation of microcracks under external influences. This hardening and the reinforcing effect are associated with the replacement of lithium ions by nickel ions in the crystal lattice structure.
含锂陶瓷在氚的生产及其积累方面有几个极具潜力的用途。然而，由于它们对外界影响、机械压力和温度变化的抵抗力较差，其应用受到限制。在这项工作中，通过溶胶 - 凝胶法，将TiO和LiClO·3HO混合，随后向反应混合物中添加NiO纳米颗粒，获得了初始纳米结构陶瓷粉末；这些粉末随后在1000℃的温度下进行10小时的热退火。热退火用于引发相变过程，并消除合成过程中产生的结构畸变。在研究过程中发现，添加NiO纳米颗粒会通过一种LiNiTiO取代类型导致固溶体的形成，这会导致结晶度和结构有序度的增加。同时，合成陶瓷的晶粒尺寸从菱形变为球形。在分析强度特性时发现，结构中LiNiTiO的形成会导致硬度和抗裂性增加；这种变化与位错有关。在分析抗裂性变化时发现，在结构中LiNiTiO相形成以及随后LiTiO相从组成中位移的过程中，抗裂性分别增加了15%和37%，这表明陶瓷抗裂性的增加以及在外部影响下微裂纹的形成。这种硬化和增强效果与晶格结构中镍离子取代锂离子有关。
