Raman analyses of co‐phasing and hysteresis behaviors in V₂O₃thin film

Abstract

We present the studies of the phase transition behaviors of V2O3 thin film using temperature‐dependent Raman scattering spectroscopy. Our results show that in both the cooling and heating processes of V2O3 thin film, the phase transition occurs gradually but not suddenly, contrary to that in single crystal. The coexistence of both the metal and insulator phases with co‐phasing ΔTc larger than 30 K is observed in both the cooling and heating processes. We discuss that this large co‐phasing ΔTc should be distinguished with the large hysteresis ΔTh reported in nanostructures. In addition, our discussions indicate that co‐phasing ΔTc and hysteresis ΔTh would be mainly correlated with stress and defect states in sample, respectively. Furthermore, our Raman analyses suggest that stress would also induce phase transitions in V2O3, and the stress (pressure)‐induced phase transitions would behave differently comparing with the temperature‐induced transitions under normal pressure. Copyright © 2012 John Wiley & Sons, Ltd.

Viscosity Property and Structure Analysis of FeO–SiO₂–V₂O₃–TiO₂–Cr₂O₃ Slags

“…16,22) The bands at about 690-710 and 730-750 cm − 1 are assigned to the structural units of vanadium and chromium in melts, respectively. 17,23,28,29) Considering that the structural behavior of irons is different in the different slag system, the present work investigated the structural behavior of various ions in FeO-SiO 2 . The band at about 698 cm − 1 was assigned to the stretching of the V-O 2 -V bond; the second vibrational mode at 524 cm − 1 was assigned to the stretching vibration of the V-O 3 bond in the medium region.…”

“…The band at about 698 cm − 1 was assigned to the stretching of the V-O 2 -V bond; the second vibrational mode at 524 cm − 1 was assigned to the stretching vibration of the V-O 3 bond in the medium region. 28,29) In addition, the third type at 992 cm − 1 was assigned to the stretching vibration mode of the short V-O 1 bond. 28,29) In the present work, the first and second types were employed to interpret Fig.…”

“…28,29) In addition, the third type at 992 cm − 1 was assigned to the stretching vibration mode of the short V-O 1 bond. 28,29) In the present work, the first and second types were employed to interpret Fig. 4, and it is worth to notice that the first type is the main existing form of V 3 + in the melt.…”

“…Vibrations of V-O-V structure group [28,29] 830-850 Vibrations of Ti-O-Si or Ti-O-Ti structure groups, or both [16,22] 850-880 SiO4 4− with zero bridging oxygen in a monomer structure (Q 0 ) [16,22] …”

Study of spin-ordering and spin-reorientation transitions in hexagonal manganites through Raman spectroscopy

“…Raman spectroscopy of magnon scattering, when observed, can directly investigate the spin properties, thus would be powerful to study not only spin-ordering transitions, but also weaker spin-reorientation transitions. However, in general, magnon scattering has much weaker intensity comparing with phonon scattering, which makes it difficult to apply Raman study of magnon scattering to investigate spin-ordering and spin-reorientation transitions212. In strong resonance condition, magnon scattering can be significantly enhanced.…”