Hydrogen–damage interactions in yttria-stabilized zirconia

Shutthanandan, V.; Thevuthasan, S.; Young, James S.; Orlando, T.M.; Weber, William J.

doi:10.1016/s0022-3115(00)00692-9

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…1 The profile corresponds to a peak defect generation probability of 1 in 1000 for every incident 45 KeV H + . (110) surface after annealing at 800 K, (b) SrTiO 3 (100) after annealing at 870 K (image from 2 ), and (c) ZrO 2 (100) after annealing at 770 K (image from 3 ). The H + doses were 1.0x10 17 , 5.0x10 16 , and 1.0x10 17 cm -2 , respectively.…”

Section: Figure S1mentioning

confidence: 99%

“…Figure S2: SEM images of H + -implanted surfaces (40 keV ion energy): (a) TiO 2 (110) surface after annealing at 800 K, (b) SrTiO 3 (100) after annealing at 870 K (image from 2 ), and (c) ZrO 2 (100) after annealing at 770 K (image from3 ). The H + doses were 1.0x10 17 , 5.0x10 16 , and 1.0x10 17 cm -2 , respectively.…”

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confidence: 99%

“…From these results, it is evident that some degree of the lattice distortions resulted from the presence of H in the bulk, but that annealing alleviates this through the diffusion of H out of the crystal, in agreement with the NRA profile measurements. Interestingly, scanning electron microscopy (SEM) analysis after heating H-implanted SrTiO 3 (100) , or ZrO 2 (100) (at comparable levels and depths) reveals extensive exfoliation as a result of H 2 bubble formation in the implanted region. However, no such macroscopic damage occurred for H-implanted TiO 2 (110) (see Figure S2).…”

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Instability of Hydrogenated TiO₂

Nandasiri

Shutthanandan

Manandhar

et al. 2015

J. Phys. Chem. Lett.

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Hydrogenated TiO2 (H-TiO2) is touted as a viable visible light photocatalyst. We report a systematic study on the thermal stability of H-implanted TiO2 using nuclear reaction analysis (NRA), Rutherford backscattering spectrometry, ultraviolet photoelectron spectroscopy, and X-ray photoelectron spectroscopy. Protons (40 keV) implanted at a ∼2 atom % level within a ∼120 nm wide profile of rutile TiO2(110) were situated ∼300 nm below the surface. NRA revealed that this H-profile broadened toward the surface after annealing at 373 K, dissipated out of the crystal into vacuum at 473 K, and was absent within the beam sampling depth (∼800 nm) at 523 K. Photoemission showed that the surface was reduced in concert with these changes. Similar anneals had no effect on pristine TiO2(110). The facile bulk diffusivity of H in rutile at low temperatures, as well as its interfacial activity toward reduction, significantly limits the utilization of H-TiO2 as a photocatalyst.

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confidence: 99%

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Instability of Hydrogenated TiO₂

Nandasiri

Shutthanandan

Manandhar

et al. 2015

J. Phys. Chem. Lett.

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“…The radiation stability and geometric and electronic structure of thin films of ZrO 2 and pristine yttria-stabilized cubic zirconia have been investigated experimentally using ion-beam bombardment, X-ray photoelectron spectroscopy, and electron- and photon-stimulated desorption. , These studies indicate that clean ZrO 2 surfaces are relatively stable to bombardment with ionizing radiation. The primary modes of radiation damage involve Auger-stimulated channels and possibly exciton decay at the surface .…”

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confidence: 99%

Electron-Stimulated Desorption of H⁺, H₂⁺, OH⁺, and H⁺(H₂O)_n from Water-Covered Zirconia Surfaces

2003

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Electron beam induced production and desorption of H + , H 2 + , OH + , and H + (H 2 O) n has been studied from water-covered zirconia surfaces. The proton yield is strongly dependent upon the form of water present with large yields mainly from multilayers or clusters. The high proton kinetic energy distributions and the linear yield vs dose are indicative of proton formation and desorption by 2-hole and 2-hole, 1-electron final states. These localized states are produced either directly or via Auger decay pathways, and desorption occurs from the vacuum surface interface as a result of a Coulomb explosion. The proton yield increases from 80 to 150 K and then drops dramatically as the temperature exceeds 150 K. The increased yield is associated with structural and physical changes in the adsorbed water and longer excited-state lifetimes. The decreased yield is correlated with water desorption. Above 180 K, a small proton signal is observable which we associate with electron-stimulated dissociation of hydroxyl groups present on the zirconia surface. At temperatures above 225 K, this yield drops and gives rise to electron-stimulated desorption of OH + ions. H 2 + is also formed from adsorbed water and involves direct dissociative ionization channels. Some reactive scattering of energetic protons and 2-hole Coulomb interactions produce H 3 O + and other higher mass clusters such as H + (H 2 O) n , where n ) 2-8. Though this is a minor channel, it yields information concerning 2-hole screening distances.

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