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高温下可稳定存在的纳米团簇由于具有科学研究意义及潜在应用价值,已引起了研究者的强烈兴趣。利用原子探针技术在温度接近1400℃(0.92Tm)的铁基合金中观察到了高稳定的纳米团簇,从而打破了人造纳米结构材料高温不稳定性约束。在一种空位作为关键合金组元,同时(Ti+Y)/O比与稳定的TiO2和Y2Ti2O7比率不同的高缺陷新材料中,观察到直径约4nm的富氧、钛和钇纳米团簇。在钛和钇存在的条件下,空位在提高氧溶解度和氧结合能方面具有不可替代的作用,因而导致共格纳米团簇的稳定性。原子探针成像特征和理论预测表明空位可首次被作为一种纳米级组分来设计具有优良高温性能的材料。
Due to its scientific significance and potential application value, nanoclusters that can be stably existed at high temperature have drawn great interest from researchers. High-stability nanoclusters were observed in Fe-based alloys near 1400 ° C (0.92Tm) using atomic probe technology, thereby breaking the high-temperature instability constraints of artificial nanostructured materials. In a new high-defect material with a vacancy as a key alloying element with a (Ti + Y) / O ratio different from that of the stabilized TiO2 and Y2Ti2O7, oxygen-rich, titanium and yttrium nanoclusters with a diameter of about 4 nm were observed. In the presence of titanium and yttrium, vacancies play an irreplaceable role in enhancing oxygen solubility and oxygen binding energy, resulting in the stability of cocrystal nanoclusters. Atomic probe imaging features and theoretical predictions show that vacancies can be used for the first time as a nanoscale component in the design of materials with excellent high temperature properties.