2025年1月5日 · Overview of XPS spectra shows that Ti, Zr, Nb, Hf, Ta, C atoms can be detected in all products, nitrogen is identified in products obtained in nitrogen atmosphere (HECN, HEN).

2024年10月14日 · The XPS and EDX results suggest that the Nb atoms diffused to the surface, and owing to its high PBR and the highly porous oxides it forms, scale failure was unavoidable. In the case of samples that did not form a scale (HEA3 and HEA4), replacing Hf with Nb severely damaged the integrity of samples due to similar reasons.

The International XPS Database provides - XPS survey spectra, XPS peak-fitted spectra, XPS valence band spectra, plasmon spectra, and six (6) tables of BEs.

2024年11月1日 · The morphology, composition, and microstructure of plasma electrolytic oxidation (PEO) coating on Hf-Nb-Ta-Zr high entropy alloy (HEA) were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Raman spectroscopy, glow discharge optical emission spectroscopy (GDOES) and ...

2022年6月15日 · In this paper, novel Ti-Zr-Hf-Nb-Fe HEAs were developed for the first time by alloying a low toxic Fe element into the TiZrHfNb alloy. Compared with the Ti-Zr-Nb-Ta-Mo and Ti-Zr-Hf-Nb-Ta refractory alloys, the Ti-Zr-Hf-Nb-Fe HEAs exhibited a lower melting point and a reduced cost of raw materials.

2025年1月3日 · NbN, NbC and Nb are known to be chemically inert with passivating oxides only soluble in HF acid. Despite all having Nb2O5 as outermost oxide layer, the oxides of Nb compounds show large differences in thickness and in electronic properties.

因此，金属在矿物中的溶解从难到难的顺序是Fe、Mn、Nb和Ta。ICP结果结合XPS定量分析表明，随着HF浓度的增加，Nb和Ta的浸出率增加，存在于矿物表面的桥联F会转化为末端F，从而促使更多的金属原子溶解远离矿物表面。因此，金属的溶解更可能在 F -浓度较高时发生。

2025年3月14日 · The similarity in the Nb–C bonds suggested that this high-temperature treatment preserved the structure of the 2D Nb 2 CT x, with no significant alterations noted in the C–F and Nb–F bonds. However, the O 1s XPS spectra of the Nb 2 C/Ni catalyst and Nb 2 C/Ni@MgH 2 composite (Fig. 3h) indicated a reduction in the peak intensity of Nb–O ...

16 小时之前 · The presence of the Nb–O band could be linked to the etching procedures during fabrication. Moreover, the XPS of Nb 4 C 3-MXene further confirmed the experimental results (Fig. 3). Figure 3A shows the full XPS survey spectra of Nb 4 C 3-MXene and AuNPs/Nb 4 C 3-MXene, which indicates the coexistence of C, O, Nb, and Au in agreement with its ...

3 天之前 · Gao et al. 5 investigated the passivation behavior of Mo 15 Nb 20 Ta 10 Ti 35 V 20 high entropy alloy by using Mott-Schottky curve analysis and XPS, which showed that the passivation film of RHEA ...