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Title: Formation of graded vanadium oxide (V–O compound) under strong gravitational field

Abstract

Sedimentation of atoms induced under strong gravitational field gives a tool for controlling elemental compositions in condensed matter. We performed a strong-gravity experiment (0.397 × 10{sup 6 }G at 400 °C for 24 h) on a V{sub 2}O{sub 5} polycrystal using the high-temperature ultracentrifuge to examine the composition change and further the structure change. The graded composition structure of V and O was formed along gravity direction, where V increases and O decreases with gravity. It was found by the x-ray diffraction and Raman scattering method that VO{sub 2} and V{sub 2}O{sub 3} phases appeared and the amounts increased, while one of the V{sub 2}O{sub 5} phase decreased gradually along gravity direction. The X-ray absorption near edge structure spectra analysis identified the chemical valency decrease (+5 to +3). The UV-Vis absorption spectroscopy addressed the shifting in center of major absorption peak to longer wavelength (red shift) with the increase in gravitational field. The tail absorption peak (band gap 2.09 eV) at strong gravity region in the graded structure showed transparent conductive oxide.

Authors:
; ; ; ;  [1]; ;  [2]
  1. Institute of Pulsed Power Science, Kumamoto University, Kumamoto 860-8555 (Japan)
  2. Faculty of Science, Kumamoto University, Kumamoto 860-8555 (Japan)
Publication Date:
OSTI Identifier:
22410203
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ABSORPTION SPECTROSCOPY; ELECTRONIC STRUCTURE; ENERGY GAP; EV RANGE; GRAVITATIONAL FIELDS; RAMAN SPECTROSCOPY; RED SHIFT; SEDIMENTATION; ULTRACENTRIFUGES; VALENCE; VANADIUM OXIDES; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY

Citation Formats

Khandaker, Jahirul Islam, Tokuda, Makoto, Ogata, Yudai, Januszko, Kamila, Mashimo, Tsutomu, E-mail: mashimo@gpo.kumamoto-u.ac.jp, Nishiyama, Tadao, and Yoshiasa, Akira. Formation of graded vanadium oxide (V–O compound) under strong gravitational field. United States: N. p., 2015. Web. doi:10.1063/1.4921102.
Khandaker, Jahirul Islam, Tokuda, Makoto, Ogata, Yudai, Januszko, Kamila, Mashimo, Tsutomu, E-mail: mashimo@gpo.kumamoto-u.ac.jp, Nishiyama, Tadao, & Yoshiasa, Akira. Formation of graded vanadium oxide (V–O compound) under strong gravitational field. United States. doi:10.1063/1.4921102.
Khandaker, Jahirul Islam, Tokuda, Makoto, Ogata, Yudai, Januszko, Kamila, Mashimo, Tsutomu, E-mail: mashimo@gpo.kumamoto-u.ac.jp, Nishiyama, Tadao, and Yoshiasa, Akira. Thu . "Formation of graded vanadium oxide (V–O compound) under strong gravitational field". United States. doi:10.1063/1.4921102.
@article{osti_22410203,
title = {Formation of graded vanadium oxide (V–O compound) under strong gravitational field},
author = {Khandaker, Jahirul Islam and Tokuda, Makoto and Ogata, Yudai and Januszko, Kamila and Mashimo, Tsutomu, E-mail: mashimo@gpo.kumamoto-u.ac.jp and Nishiyama, Tadao and Yoshiasa, Akira},
abstractNote = {Sedimentation of atoms induced under strong gravitational field gives a tool for controlling elemental compositions in condensed matter. We performed a strong-gravity experiment (0.397 × 10{sup 6 }G at 400 °C for 24 h) on a V{sub 2}O{sub 5} polycrystal using the high-temperature ultracentrifuge to examine the composition change and further the structure change. The graded composition structure of V and O was formed along gravity direction, where V increases and O decreases with gravity. It was found by the x-ray diffraction and Raman scattering method that VO{sub 2} and V{sub 2}O{sub 3} phases appeared and the amounts increased, while one of the V{sub 2}O{sub 5} phase decreased gradually along gravity direction. The X-ray absorption near edge structure spectra analysis identified the chemical valency decrease (+5 to +3). The UV-Vis absorption spectroscopy addressed the shifting in center of major absorption peak to longer wavelength (red shift) with the increase in gravitational field. The tail absorption peak (band gap 2.09 eV) at strong gravity region in the graded structure showed transparent conductive oxide.},
doi = {10.1063/1.4921102},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 18,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}