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.

X-ray diffraction (XRD) and Transmission electron microscope (TEM) techniques confirmed the crystallinity of the thin films.

NbO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Nb4+ is bonded to six equivalent O2- atoms to form a mixture of edge and corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 44°. There are two shorter (2.04 Å) and four longer (2.10 Å) Nb–O bond ...

2022年8月1日 · Here, we demonstrate a synthesis route for polycrystalline films of cubic NbO, tetragonal NbO2 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.

2022年8月1日 · XRD analyzes revealed the successful decoration of silver (Ag)NPs into Nb 2 O 5 nanostructure by showing silver diffraction planes at (200) and (111) among Nb 2 O 5 diffraction planes. Surface-enhanced Raman spectroscopic (SERS) analyzes revealed an enhancement in the monoclinic (H Nb 2 O 5 ) at 1156.2 cm −1 demonstrating a successful hot ...

2016年2月16日 · The tetragonal phase of NbO 2 can be well revealed by its XRD pattern, which is indexed to JCPDS No. 43-1043 with diffraction peaks at 2θ of 26.0 o (400), 35.2 o (222), 37.1 o (440), 39.9 o...

Niobium dioxide (NbO2) features a high theoretical capacity and an outstanding electron conductivity, which makes it a promising alternative to the commercial graphite negative electrode....

NbO2 is zeta iron carbide-like structured and crystallizes in the tetragonal I4_1 space group. The structure is three-dimensional. there are two inequivalent Nb4+ sites. In the first Nb4+ site, Nb4+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NbO6 octahedra.

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.

In this work, we conducted a thorough characterization of redox-exfoliated NbS2 nanoflakes regarding their structure and stability in an oxygen-rich environment. Structural, morphological, and...