journal article·2020-10-01Open access

Unraveling the electronic structures in different phases of gadolinium sesquioxides performed by electron energy loss spectroscopy

Guo-Jiun Shu, Sz-Chian Liou, W. Chun-Hsin Kuo, Chien-Ting Wu, Pei-Chieh Wu, Christopher J. Klingshirn, Jueinai Kwo, Minghwei Hong

AIP Advances· Volume 10· Issue 10

Abstract

The gadolinium sesquioxide (Gd2O3) with its bandgap of ∼5.4 eV and high dielectric permittivity and refractive index has been used widely in optics, magnetic resonance imaging, and high k dielectrics. Electron energy loss spectroscopy (EELS) reveals spectral features at 13.5 eV and 15 eV, which can be interpreted as surface and volume plasmons, respectively. The unusual surface exciton polariton, with surface resonances associated with excitonic onsets, was also observed at ∼7.5 eV. Because of the differences in electronic structures between the cubic and the monoclinic phases of Gd2O3, it is straightforward to distinguish the two phases using the low-loss regime and O K-edge as a fingerprint. We further successfully performed EELS and electron diffraction to identify the crystalline phase of a single-crystal Gd2O3 film epitaxially grown on a Si(111) substrate.
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Research context

OpenAlex topics: Semiconductor materials and devices · Electronic and Structural Properties of Oxides · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials and Mineral Resources Engineering, National Taipei University of Technology 1 , Taipei 10608, Taiwan

Institute of Mineral Resources Engineering, National Taipei University of Technology 2 , Taipei 10608, Taiwan

Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology 3 , Taipei 10622, Taiwan

Advanced Imaging and Microscopy Laboratory, Maryland NanoCenter, Institute for Research in Electronic and Applied Physics, University of Maryland 4 , College Park, Maryland 20742, USA

Materials Characterization Facility, Texas A&M University 5 , College Station, Texas 77845, USA

Materials Analysis Division, Taiwan Semiconductor Research Institute, National Applied Research Laboratories 6 , Hsinchu 300091, Taiwan

Department of Material Science and Engineering, University of Maryland 7 , College Park, Maryland 20742, USA

Department of Physics, National Tsing Hua University 8 , Hsinchu 30013, Taiwan

Graduate Institute of Applied Physics and Department of Physics, National Taiwan University 9 , Taipei 10617, Taiwan

Funding

Ministry of Science and Technology, Taiwan

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