Sikora Emőke, Kristály Ferenc, Tergalecz Dora, Sycheva Anna, Ferenczi Tibor, Sveda Maria, Janovszky Dora
Institute of Chemistry, University of Miskolc, Miskolc, Hungary.
Department of Mineralogy and Petrography, University of Miskolc, Miskolc, Hungary.
Sci Rep. 2025 May 29;15(1):18835. doi: 10.1038/s41598-025-03976-8.
The effect of the combined addition of Mo and Ti on the phase evolution of non-equiatomic (CoFeNi)MoTi (x = 2,4,6,8,10,12) alloys produced by high-energy ball-milling was investigated. Based on the preliminary phase stability criteria, solid solution formation is expected for each composition, a face-centred structure (FCC) phase if x is less than 10, and FCC and body-centred structure (BCC) phase in other cases. After 35 h of milling, solid solution structures were successfully produced in all samples; an FCC, two BCC structure phases, and a small amount of Co phase were identified based on X-ray diffraction. One of the BCC phases is Mo-based (BCC1(Mo)), while the other is a Fe-based (BCC2(Fe) solid solution. Increasing the combined amount of Mo and Ti alloying up to 20 at% (x = 8), the amount of the FCC structure was dominant, while above 20 at% (x = 10), the amount of the two BCC lattice structures was predominant. The average particle sizes were smaller than 3 μm. The specific surface area of all composition powders was less than 0.25 m/g, which is extremely rare for a catalyst. All HEA powders containing Mo and Ti demonstrated enhanced photocatalytic activity in the decolorisation of Rhodamine B dye (RhB). The optimum conditions for RhB decolorisation were a pH of 2 and a catalyst dosage of 1 g/L. Under these conditions, (CoFeNi)MoTi, (CoFeNi)MoTi, and (CoFeNi)MoTi demonstrated high efficiencies of 97.6, 98.6 and 98.7%, respectively, already in the first minute of reaction.
研究了Mo和Ti的复合添加对高能球磨制备的非等原子(CoFeNi)MoTi(x = 2、4、6、8、10、12)合金相演变的影响。根据初步的相稳定性标准，预计每种成分都会形成固溶体，当x小于10时为面心立方结构(FCC)相，其他情况下为FCC和体心立方结构(BCC)相。球磨35小时后，所有样品均成功制备出固溶体结构；基于X射线衍射鉴定出一个FCC相、两个BCC结构相和少量Co相。其中一个BCC相是Mo基的(BCC1(Mo))，另一个是Fe基的(BCC2(Fe)固溶体)。将Mo和Ti合金化的总量增加到20at%(x = 8)时，FCC结构的量占主导，而高于20at%(x = 10)时，两种BCC晶格结构的量占主导。平均粒径小于3μm。所有成分粉末的比表面积均小于0.25m/g，这对于催化剂来说极为罕见。所有含Mo和Ti的高熵合金粉末在罗丹明B染料(RhB)脱色中均表现出增强的光催化活性。RhB脱色的最佳条件是pH为2，催化剂用量为1g/L。在这些条件下，(CoFeNi)MoTi、(CoFeNi)MoTi和(CoFeNi)MoTi在反应的第一分钟就分别表现出97.6%、98.6%和98.7%的高效率。
