EXAFS studies of doped-ZrO2 systems

Cole, Michael; Catlow, C. Richard A.; Dragun, J.P.

doi:10.1016/0022-3697(90)90156-a

Cited by 41 publications

(19 citation statements)

References 3 publications

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“…8 EXAFS analysis shows that in tetragonal and cubic phases, the oxygen vacancies are associated mostly with the Zr in the vicinity of the RE ion rather than directly with the dopant ion. 9,10 The dielectric measurements performed on the doped zirconia have shown similar results. 11 Thus, the surrounding of Zr 4þ ion in the vicinity of the dopant is distorted, and this could affect the luminescence of RE ions.…”

Section: Introductionmentioning

confidence: 52%

The role of Nb in intensity increase of Er ion upconversion luminescence in zirconia

Šmits

Šarakovskis

Grigorjeva

et al. 2014

Journal of Applied Physics

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It is found that Nb co-doping increases the luminescence and upconversion luminescence intensity in rare earth doped zirconia. Er and Yb-doped nanocrystalline samples with or without Nb co-doping were prepared by sol-gel method and thermally annealed to check for the impact of phase transition on luminescence properties. Phase composition and grain sizes were examined by X-ray diffraction; the morphology was checked by scanning-and high-resolution transmission electron microscopes. Both steady-state and time-resolved luminescence were studied. Comparison of samples with different oxygen vacancy concentrations and different Nb concentrations confirmed the known assumption that oxygen vacancies are the main agents for tetragonal or cubic phase stabilization. The oxygen vacancies quench the upconversion luminescence; however, they also prevent agglomeration of rare-earth ions and/or displacement of rare-earth ions to grain surfaces. It is found that co-doping with Nb ions significantly (>20 times) increases upconversion luminescence intensity. Hence, ZrO 2 :Er:Yb:Nb nanocrystals may show promise for upconversion applications. V

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Section: Introductionmentioning

confidence: 52%

The role of Nb in intensity increase of Er ion upconversion luminescence in zirconia

Šmits

Šarakovskis

Grigorjeva

et al. 2014

Journal of Applied Physics

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“…The calculations explain contradictory experimental reports of whether oxygen vacancies prefer to bind to dopant or host Zr atoms [191][192][193][194][195][196][197][198][199][200][201], and show variations due to the chemical identity of the dopant. The observed ordering tendencies can be well understood in terms of a balance between competing electrostatic and elastic defect interactions, the latter depending on the dopant identity.…”

Section: Defectsmentioning

confidence: 89%

“…Even for the most studied case, yttriastabilized zirconia (YSZ), the experimental results support different defect configurations: while some of them suggest that oxygen vacancies are bonded to the dopant Y [190][191][192][193][194][195][196], others claim host Zr-vacancy bonds [197][198][199][200][201]. The strength of the vacancy-ion bonds is also a matter of discussion.…”

Section: Defectsmentioning

confidence: 95%

Adhesion at metal–ZrO2 interfaces

Muñoz

Gallego

Beltrán

et al. 2006

Surface Science Reports

183

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“…According to various reports on doped zirconia systems, the peaks in the range of 1.8-2.5 Å are related to Zr-O bonds while the peaks in the range of 3-4 Å are attributed to the Zr-Zr bonds [27,41]. Cole et al reported only one peak in case of cubic phase of zirconia while Li et al showed split of the first peak into two for tetragonal structure of zirconia [42,43]. The first Zr-O peak in the Fourier transform of EXAFS spectra in the present case also confirmed formation of cubic phase.…”

Section: Resultsmentioning

confidence: 93%