Valence state of B and Ta cations in the AB1/2Ta1/2O3 ceramics (A = Ca, Sr, Ba, Pb; B = Fe, Sc) from X-ray photoelectron and Mössbauer spectroscopy data

Kozakov, A. T.; Кочур, А.Г.; Никольский, А. В.; Raevski, I. P.; Кубрин, С. П.; Raevskaya, S. I.; Титов, В. В.; Gusev, A. A.; Исупов, В. П.; Li, G.; Zakharchenko, I. N.

doi:10.1016/j.elspec.2019.146918

Cited by 14 publications

(1 citation statement)

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“…The less intense peak at 529.6 eV corresponds to oxygen bound to vanadium atoms in V 4+ and V 5+ oxidation states [ 27 , 28 ]. The stronger peak at 531.6 eV likely corresponds to oxygen [ 29 ] or/and OH groups [ 30 , 31 ] adsorbed on the surface. Some authors also assign this peak as a state corresponding to oxygen vacancies inside the film [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Photothermal Effect and Phase Transition in VO2 Enhanced by Plasmonic Particles

et al. 2023

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Phase change metasurfaces based on VO2, which are pre-heated with electric current and optically addressed by projected structured light hologram, are considered to become a new paradigm in programmed THz/middle IR flat optics. Macroscopic quasi-homogeneous arrays of Au nanoparticles show large near IR absorption and a significant photothermal effect capable of boosting a light-triggered switching of VO2 and are to be carefully examined. We propose a new approach to simultaneously probe the altered temperature and electric conductivity of a hybrid Au particle-VO2 film composite by monitoring a phase shift and attenuating a surface acoustic wave in a YX128° cut LiNbO3 substrate. The method shows a temperature resolution of 0.1 °C comparable with the best existing techniques for studying nanoobjects and surfaces. The laser-induced photothermal effects were characterized in a macroscopic array of Au nanostars (AuNSts) with different surface coverage. In a monolayer of 10 nm Au, coupled plasmonic nanoparticles were deposited on the LiNbO3 substrate. An optically triggered insulator-metal transition assisted by photothermal effect in AuNSts/VO2/TiO2/LiNbO3 composites was studied at varied light power. We believe that the proposed SAW-based method is of significant importance for the characterization and optimization of radiation absorbing or/and electrically heated elements of metasurfaces and other devices for lab-on-chip and optical communication/processor technology.

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