Optical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition

Optical properties of the UO2+x film deposited by a polymer-assisted deposition method have been investigated by spectroscopic ellipsometry (SE). This epitaxial film contains at least two kinds of uranium oxides of U3O8 and UO3, and the O/U ratio is 2.74, which is confirmed by x-ray diffraction (XRD...

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Autores principales:	Dongxu Zhang, Haopeng Dong, Yuanfu Lou, Yongqiang Zhong, Fangfang Li, Xiaoguo Fu, Yuxiang Zheng, Wenwu Li
Formato:	article
Lenguaje:	EN
Publicado:	AIP Publishing LLC 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/385e57fda8e44546919fc5febc50a06e
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spelling	oai:doaj.org-article:385e57fda8e44546919fc5febc50a06e2021-12-01T18:52:06ZOptical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition2158-322610.1063/5.0068829https://doaj.org/article/385e57fda8e44546919fc5febc50a06e2021-11-01T00:00:00Zhttp://dx.doi.org/10.1063/5.0068829https://doaj.org/toc/2158-3226Optical properties of the UO2+x film deposited by a polymer-assisted deposition method have been investigated by spectroscopic ellipsometry (SE). This epitaxial film contains at least two kinds of uranium oxides of U3O8 and UO3, and the O/U ratio is 2.74, which is confirmed by x-ray diffraction (XRD) and scanning Auger microscopy methods. By investigating the optical constants, the bandgaps of U3O8 and UO3 are determined as 2.3 and 1.0 eV, respectively, and 80% of the epitaxial film is U3O8 and 20% is UO3. The speciation signatures from the XRD and band structures show that the UO2+x epitaxial film reduced to U3O8 with the heating treatment at 480 K in a vacuum while oxidized to UO3 at 650 K. This work demonstrates a useful tool for studying the optical properties, band structures, and phase transition of uranium oxide film by SE.Dongxu ZhangHaopeng DongYuanfu LouYongqiang ZhongFangfang LiXiaoguo FuYuxiang ZhengWenwu LiAIP Publishing LLCarticlePhysicsQC1-999ENAIP Advances, Vol 11, Iss 11, Pp 115107-115107-6 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Dongxu Zhang Haopeng Dong Yuanfu Lou Yongqiang Zhong Fangfang Li Xiaoguo Fu Yuxiang Zheng Wenwu Li Optical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition
description	Optical properties of the UO2+x film deposited by a polymer-assisted deposition method have been investigated by spectroscopic ellipsometry (SE). This epitaxial film contains at least two kinds of uranium oxides of U3O8 and UO3, and the O/U ratio is 2.74, which is confirmed by x-ray diffraction (XRD) and scanning Auger microscopy methods. By investigating the optical constants, the bandgaps of U3O8 and UO3 are determined as 2.3 and 1.0 eV, respectively, and 80% of the epitaxial film is U3O8 and 20% is UO3. The speciation signatures from the XRD and band structures show that the UO2+x epitaxial film reduced to U3O8 with the heating treatment at 480 K in a vacuum while oxidized to UO3 at 650 K. This work demonstrates a useful tool for studying the optical properties, band structures, and phase transition of uranium oxide film by SE.
format	article
author	Dongxu Zhang Haopeng Dong Yuanfu Lou Yongqiang Zhong Fangfang Li Xiaoguo Fu Yuxiang Zheng Wenwu Li
author_facet	Dongxu Zhang Haopeng Dong Yuanfu Lou Yongqiang Zhong Fangfang Li Xiaoguo Fu Yuxiang Zheng Wenwu Li
author_sort	Dongxu Zhang
title	Optical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition
title_short	Optical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition
title_full	Optical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition
title_fullStr	Optical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition
title_full_unstemmed	Optical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition
title_sort	optical properties, band structures, and phase transition of uo2+x epitaxial films deposited by polymer-assisted deposition
publisher	AIP Publishing LLC
publishDate	2021
url	https://doaj.org/article/385e57fda8e44546919fc5febc50a06e
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Optical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition

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