2019年4月29日 · X-ray diffraction (XRD) and Raman spectroscopy confirmed the tetragonal phase of NbO2 and orthorhombic phase of Nb2O5 for similar deposition temperatures. Scanning electron microscopy (SEM) observations indicate that NbO2 has a unique nanoslice structure while Nb2O5 has a flake-like structure.

2022年1月1日 · XRR and HR-TEM studies confirm formation of a thin SiO 2 layer on Si substrate. The XPS analysis ensures the formation of NbO 2 -Nb 2 O 5 composition. Change in leakage current is observed depending upon the grain size. The Cole–Cole analysis indicates a dispersive relaxation phenomena in the samples.

2022年8月1日 · Here, we demonstrate a synthesis route for polycrystalline films of cubic NbO, tetragonal NbO 2 and monoclinic Nb2 O 5, based on reactive dc magnetron sputtering at moderate temperature and post-annealing in vacuum. Varying the O 2 flow during deposition is used to tune the stoichiometry and subsequent annealing induces crystal formation.

2013年2月28日 · In this paper, the electronic structures of NbO2 and Nb2O5 are theoretically and experimentally analyzed. The oxides in the samples are mainly consisted of NbO2 and NbO, whereas the outmost layer of ...

2016年2月16日 · We construct a series of nanoarchitectured intercalation materials including orthorhombic (o-) Nb2O5 hollow microspheres, o-Nb2O5@carbon core-shell microspheres and tetragonal (t-)...

2013年2月28日 · 本文从理论上和实验上分析了 NbO2 和 Nb2O5 的电子结构。 样品中的氧化物主要由 NbO2 和 NbO 组成，而样品的最外层是 NbO2。 暴露在空气中后，所有铌样品的最外层都是 Nb2O5。

2022年1月1日 · As proven by Islam et al. [63], NbO2 exhibits semiconducting properties whereas Nb2O5 shows insulating properties. The reduction of Nb2O5 to NbO2 in this study facilitated the charge transfer between Mg and Nb content for boosting the dehydrogenation process due to the high catalytic effect of NbO2.

Scanning electron microscopy (SEM) observations indicate that NbO 2 has a unique nanoslice structure while Nb 2 O 5 has a flake-like structure. The optical transmittance of the films has been investigated and found to be dependent on the oxygen gas content during deposition; the optical transmittance decreases with increasing O 2 gas content.

2021年2月3日 · Temperature-dependent extended X-ray absorption fine structure spectroscopy (T-EXAFS) reveals a gradual weakening of the bulk Nb dimers over a large temperature range, which is indicative of a second-order Peierls mechanism. From these measurements, we determine the critical dimer distance to be 2.77 Å.

2016年9月29日 · Quantitative composition analysis from electron energy loss spectroscopy (EELS) showed the stoichiometry of the nominal 15 nm NbO 2 layer in the as-fabricated MIM device deviated from the target...