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Neutral and metallic *** and semiconducting surface layer in acceptor doped CeO_(2)

International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 795-802页

作者： Ilan Riess Physics Department Technion IITHaifa 3200003Israel

The monomolecular surface layer of acceptor doped CeO_(2) may become neutral and metallic or charged and *** is revealed in the theoretical analysis of the oxygen pressure dependence of the surface defects concentration in acceptor doped ceria with two different dopant types and operated under different oxygen *** published experimental data for highly reduced Sm0.2Ce0.8O1.9-x(SDC)containing a fixed valence dopant Sm3+are very different from those published for Pr0.1Ce0.9O_(2)-x(PCO) with the variable valence dopant Pr4+/Pr3+being reduced under milder *** theoretical analysis of these experimental results fits very well the experimental results of SDC and *** leads to the following predictions:the highly reduced surface of SDC is metallic and neutral,the metallic surface electron density of state is gs=0.9×10^(38)J-1·m^(-2)(1.4×1015eV^(-1)·cm^(-2)),the electron effective mass is meff,s=3.3me,and the phase diagram of the reduced surface has theα(fcc)structure as in the *** PCO a double layer is predicted to be formed between the surface and the bulk with the surface being negatively charged and *** surface of PCO maintains high Pr^(3+) defect concentration as well as relative high oxygen vacancy concentration at oxygen pressures higher than in the *** reasons for the difference between a metallic and semiconducting surface layer of acceptor doped CeO_(2) are reviewed,as well as the key theoretical considerations applied in coping with this *** that we make use of the experimental data and theoretical analysis available for acceptor doped ceria.

关键词： CeO_(2) surface defects metallic surface oxide reduction Sm doped CeO_(2) Pr doped CeO_(2)

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Analysis of dipole-like ultra high frequency RFID tags close to metallic surfaces

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1217-1222页

作者： Ling-fei MO Hong-jian ZHANG Hong-liang ZHOU State Key Lab of Industrial Control Technology Department of Control Zhejiang University Hangzhou 310027 China

It is a challenge for passive RFID tags to be mounted on the surface of metal because the parameters of tag antennas,such as the impedance matching,the radiation efficiency and the radiation pattern,are seriously affected by the metallic *** paper presents the characteristics of the dipole-like antennas of ultra high frequency(UHF) radio frequency identification(RFID) tags that are placed close to metallic *** finite element method(FEM) and method of moment(MoM) were used to simulate the changes of the antenna parameters near the metallic *** typical dipole-like antennas close to the metallic surface,a closed loop antenna and a loaded meander antenna,were modeled,and the performance was *** was carried out and the results were in good agreement with the simulation,showing that a distance of 0.05λ～0.1λ(λ is the free space wavelength) from the metallic surface could make the dipole-like UHF RFID tag performance be acceptable.

关键词： Radio frequency identification (RFID) Tag metallic surface Finite element method (FEM) Method of moment (MoM)

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The closed-orbit and the photoabsorption spectra of the Rydberg hydrogen atom between two parallel metallic surfaces

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Chinese Physics B 2007年第3期16卷 692-699页

作者：王德华 College of Physics and Electronic Engineering Ludong University Yantai 264025 China

Using the closed orbit theory, we study the classical motion and calculatethe photoabsorption spectra of Rydberg hydrogen atom between two parallel metallic surfaces. The results show that the metallic surfaces have a significant effect on the photoabsorption process. When the distances between the hydrogen atom and the two metallic surfaces are close to a critical value dc, the number of the closed orbits is the greatest. When the distance larger or smaller than dc, the number of the closed orbits decreases and the absorption spectra are shown to exhibit a damping oscillation. This work is an interesting new application of closed-orbit theory and is of potential experimental interest.

关键词： closed orbit photoabsorption spectra metallic surface

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