Covalent insulator<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Optical reflectivity measurements

Marabelli, F.; Wächter, P.

doi:10.1103/physrevb.36.1238

Cited by 284 publications

(134 citation statements)

References 21 publications

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“…Overall, these calculations give lattice parameters within 1% of the experimental values, slightly improving over the DFT(+U) results. The calculated electronic structures, i.e., the band dispersions and the position of the empty Ce 4f and Ce 5d bands with respect to the occupied O 2p bands are also in good agreement with experimental data [19][20][21][22][23].…”

Section: Introductionsupporting

confidence: 71%

“…The electronic structure of CeO 2 has been probed by different experimental techniques, including valence x-ray photoemission spectroscopy (XPS) [19][20][21][22], O 1s x-ray absorption spectroscopy (XAS) [20], electron energy loss spectroscopy (EELS) [20,21], and optical reflectance (OR) [23]. The valence band, composed of O 2p states is separated by a gap of ~3 eV from a quite narrow unoccupied band composed of Ce 4f states.…”

Section: Introductionmentioning

confidence: 99%

“…CeO 2 is an insulator with a large band gap [19][20][21][22][23]. The electronic structure of CeO 2 has been probed by different experimental techniques, including valence x-ray photoemission spectroscopy (XPS) [19][20][21][22], O 1s x-ray absorption spectroscopy (XAS) [20], electron energy loss spectroscopy (EELS) [20,21], and optical reflectance (OR) [23].…”

Section: Introductionmentioning

confidence: 99%

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Disentangling the role of small polarons and oxygen vacancies in CeO2

et al. 2017

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The outstanding performance of cerium oxide (CeO 2 ) as ion conductor or catalyst strongly depends on the ease of Ce 4+ ↔Ce 3+ conversion and oxygen vacancyformation. An accurate description of Ce 3+ and oxygen vacancy is therefore essential to further progress in this area. Using the HSE06 hybrid functional, we investigate the formation and migration of small polarons (Ce 3+ ) and their interaction with oxygen vacancies in CeO 2 , considering the small polaron and vacancy as independent entities.Oxygen vacancies are double donors and can bind up to two small polarons, forming a positively charged or neutral complex. We compute the electron self-trapping energy (i.e., energy gain when forming a small polaron), the small-polaron migration barrier, vacancy formation and migration energies, and vacancy-polaron binding energies. We find that small polarons weakly bind to oxygen vacancies, yet this interaction significantly contributes to the activation energy for hopping electronic conductivity.The results are compared with previous calculations and discussed in the light of available experimental data.

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Section: Introductionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Disentangling the role of small polarons and oxygen vacancies in CeO2

et al. 2017

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“…The resulting fits are shown in red in the plots in Figure 3 ("dispersion fit"), and the corresponding parameter values are provided in Table II. The dispersion behavior implied for undoped and 20% Sm doped ceria is summarized in Figure 4, where Fig. 4(a) compares the present results for undoped ceria with literature values, [14][15][16][17][18][19] and Fig. 4(b) compares the three films studied here to one another.…”

Section: Optical Propertiesmentioning

confidence: 90%

“…The parameters obtained from the fitting are in good agreement with the independently measured values, providing a validation of the procedures. [14][15][16][17][18][19] (b) substrate and dopant effects. Deposition on MgO(100) (Film #3) leads to a slight decrease in n relative to deposition on YSZ(100) (Film #1), likely due to poorer crystallographic registry between film and substrate creating a slightly lower density.…”

Section: Microstructural Properties a Model Validation Using Densmentioning

confidence: 99%

Determination of optical and microstructural parameters of ceria films

Oh¹,

Tokpanov²,

Hao³

et al. 2012

Journal of Applied Physics

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Optimization of Nb2O5/Ag/Nb2O5 multilayers as transparent composite electrode on flexible substrate with high figure of merit J. Appl. Phys. 112, 103113 (2012) Modulation of external electric field on surface states of topological insulator Bi2Se3 thin films Appl. Phys. Lett. 101, 223109 (2012) Ultra-thin perfect absorber employing a tunable phase change material Appl. Phys. Lett. 101, 221101 (2012) Optical properties of Mg-doped VO2: Absorption measurements and hybrid functional calculations Appl. Phys. Lett. 101, 201902 (2012) Additional information on J. Appl. Phys. Light-matter interactions are of tremendous importance in a wide range of fields from solar energy conversion to photonics. Here the optical dispersion behavior of undoped and 20 mol. % Sm doped ceria thin films, both dense and porous, were evaluated by UV-Vis optical transmission measurements, with the objective of determining both intrinsic and microstructural properties of the films. Films, ranging from 14 to 2300 nm in thickness, were grown on single crystal YSZ(100) and MgO(100) using pulsed laser deposition (both dense and porous films) and chemical vapor deposition (porous films only). The transmittance spectra were analyzed using an in-house developed methodology combining full spectrum fitting and envelope treatment. The index of refraction of ceria was found to fall between 2.65 at a wavelength of 400 nm and 2.25 at 800 nm, typical of literature values, and was relatively unchanged by doping. Reliable determination of film thickness, porosity, and roughness was possible for films with thickness ranging from 500 to 2500 nm. Physically meaningful microstructural parameters were extracted even for films so thin as to show no interference fringes at all. V C 2012 American Institute of Physics.

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Metal Oxide Nanoparticles

Fernández

Rodríguez

2005

Encyclopedia of Inorganic Chemistry

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This article covers the fundamental science, synthesis, characterization, physicochemical properties, and applications of oxide nanomaterials. It also explains the fundamental aspects that determine the growth and behavior of these systems, briefly examines synthetic procedures using bottom‐up and top‐down fabrication technologies, discusses the sophisticated experimental techniques and state‐of‐the‐art theory results used to characterize the physicochemical properties of oxide solids, and describes the current knowledge concerning key oxide materials with important technological applications.

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Covalent insulatorCeO2: Optical reflectivity measurements

Cited by 284 publications

References 21 publications

Disentangling the role of small polarons and oxygen vacancies in CeO2

Disentangling the role of small polarons and oxygen vacancies in CeO2

Determination of optical and microstructural parameters of ceria films

Metal Oxide Nanoparticles

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