Apr 29, 2019 · 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.

Jan 1, 2022 · 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.

Aug 1, 2022 · The study reveals that cubic NbO, tetragonal NbO2, and monoclinic Nb2O5 thin films can be synthesized through DC reactive magnetron sputtering at moderate temperatures, followed by post-annealing within the range of 600–800 °C.

Jul 1, 2016 · Massalski shows the existence of four thermodynamically stable phases of niobium–oxygen system (Nb, NbO, NbO 2 and Nb 2 O 5) with very narrow single-phase fields and negligible deviations from the exact stoichiometry [12], [19].

Feb 28, 2013 · After exposure to air, the outermost layer on all niobium samples is Nb 2 O 5. The photoelectrons from the first 2–4 Å contribute to the spectra, so the valence band structure of NbO 2 and Nb 2 O 5 can be confirmed from ultraviolet photoelectron spectroscopy (UPS).

Sep 29, 2016 · Kim, S. et al. Ultrathin (<10 nm) Nb2O5/NbO2 hybrid memory with both memory and selector characteristics for high density 3D vertically stackable RRAM applications.

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.

Feb 16, 2016 · We construct a series of nanoarchitectured intercalation materials including orthorhombic (o -) Nb 2 O 5 hollow microspheres, o -Nb 2 O 5 @carbon core-shell microspheres and tetragonal (t -)...

The results show that, the niobium oxide assumes mainly the form of Nb2O5 on ceria supports, and plays a significant role in switching the physicochemical nature of ceria and the resulting...

The studies indicate that NbO2 content in the NbO2-Nb2O5 film decreases with the oxygen content in the plasma. The real (ɛ‧) and imaginary (ɛ‧‧) part of dielectric constant, dissipation factor (tanδ) and ac conductivity (σac) are found to be dependent on the oxygen content in the film.