Tailoring B-Site Preferential Occupations for Tunable Magnetism in Spinel High-Entropy Oxides via Nonmagnetic Al3+ Probe
Tailoring B-Site Preferential Occupations for Tunable Magnetism in Spinel High-Entropy Oxides via Nonmagnetic Al3+ Probe
研究概述
以非磁性Al³⁺探针调控尖晶石高熵氧化物的八面体位点占据，导致四面体膨胀及八面体金属–氧键收缩，从而改变磁交换作用与磁挫折。研究观察到铁磁/反铁磁竞争、自旋玻璃等行为；Al含量超过x=2时，自旋挫折因弱冻结和无序磁矩而受到抑制。
谱图与表征信息
Figure 3. XAFS spectra of 5 M in [5M1/(5+x)Alx/(5+x)]3O4 with x = 0 and 5. (a−e) K-edge XANES spectra for each cation (Co, Fe, Zn, Cr, Mn). (f) Comparison of the pre-edge peak of Mn. (g) EXAFS spectra.