The local structure characterization and resulting phase-transition mechanism of amorphous ZrO2

Yanwei, Zeng; Fagherazzi, G.; Polizzi, Stefano

doi:10.1007/bf00353048

Cited by 19 publications

(14 citation statements)

References 16 publications

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“…It is observed that the tetragonal and/or monoclinic phases evolve from the initial amorphous phase after calcination at lower temperatures (400-500uC), which has been attributed to the structural similarities between the evolving phases and the amorphous phase. [51][52][53][54][55][56][57][58] Livage et al 51 determined the Zr-Zr interatomic distances in the amorphous dried ZrO 2 using the electron density and neutron diffraction measurements, which are found to be 0 . 22, 0 .…”

Section: Role Of Structural Similaritiesmentioning

confidence: 99%

“…Yanwei et al 55 determined the local structure in two different amorphous ZrO 2 gel (xerogel and aerogel) samples through a topological structure simulation of radial atomic number density distribution functions derived from wide-angle X-ray scatterings (WAXS) intensity data using Fourier Transform. The Zr-O and Zr-Zr interatomic distances obtained by this analysis (for both the xerogel and aerogel samples) are presented in Table 6 along with the respective interatomic distances reported for the monoclinic and tetragonal ZrO 2 particles.…”

Section: Role Of Structural Similaritiesmentioning

confidence: 99%

“…A better match between the model monoclinic structure and the amorous phase is also obtained, for long-range order, when the paracrystal model is used to obtain the radial atomic density distribution. Yanwei et al, 55 hence, concluded that the local structure in the amorphous ZrO 2 is equivalent to the monoclinic crystal structure. Further, Stachs et al 56 determined structure functions for amorphous ZrO 2 xerogels using XRD and constructed three-dimensional structure models consistent with the experimental data using reverse Monte Carlo simulations.…”

Section: Role Of Structural Similaritiesmentioning

confidence: 99%

See 2 more Smart Citations

Mechanisms of room temperature metastable tetragonal phase stabilisation in zirconia

Shukla¹,

Seal²

2005

International Materials Reviews

374

241

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Mechanisms of tetragonal phase stabilisation, at room temperature, in nanocrystalline (,100 nm), submicrometre-sized (100 nm-1 mm), and bulk zirconia (ZrO 2 ) (.1 mm) are reviewed in detail. The merits, demerits and scope of each individual model are outlined. The analysis of the literature shows that, although the mechanism of tetragonal phase stabilisation in bulk ZrO 2 is well understood, the room temperature tetragonal phase stabilisation mechanism in undoped, nanocrystalline ZrO 2 is controversial. Various proposed models, based on surface energy (nanocrystallite size), strain energy, internal and external hydrostatic pressure, structural similarities, foreign surface oxides, anionic impurities, water vapour and lattice defects (oxygen ion vacancies), are discussed in detail. It is proposed that generation of excess oxygen ion vacancies within the nanocrystalline ZrO 2 is primarily responsible for the room temperature tetragonal phase stabilisation, below a critical size. Hence, the mechanism of tetragonal phase stabilisation in nanocrystalline ZrO 2 appears to be the same as that in doped ZrO 2 (at room temperature) and undoped ZrO 2 (at higher temperature).

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Section: Role Of Structural Similaritiesmentioning

confidence: 99%

Section: Role Of Structural Similaritiesmentioning

confidence: 99%

Section: Role Of Structural Similaritiesmentioning

confidence: 99%

See 1 more Smart Citation

Mechanisms of room temperature metastable tetragonal phase stabilisation in zirconia

Shukla¹,

Seal²

2005

International Materials Reviews

374

241

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“…For energies covering the region of the Bragg peak, i.e. $0.1 MeV/u for protons and $0.3 MeV/u for helium ions, the mean free path is comparable to or smaller than the distance between the ionic constituents of the ZrO 2 crystal lattice, $2 Â 10 À8 cm from [33], implying that every crystallographic ion in the radiation particles path will be ionised (or undergo electronic excitation). Fig.…”

Section: Resultsmentioning

confidence: 99%

Inelastic cross-sections and energy loss properties by non-relativistic heavy ions in zirconium dioxide

Schofield

Pimblott

2016

Nuclear Instruments and Methods in Physics Research Section B:

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a b s t r a c tA formalism for the inelastic cross-section for electronic collisions of protons and heavier ions in a material is developed based on a quadratic extrapolation of the experimentally based dipole oscillator strength distribution (DOSD) of the material into the energy momentum plane. The approach is tested by calculating various energy loss properties in zirconium dioxide. Mean free path, stopping power and continuous slowing down approximation (csda) range are predicted as a function of ion energy for various incident ions, with the stopping powers compared to experimental data to assess the effectiveness of the methodology. The DOSD is straightforwardly obtained from the experimentally measured energy loss function data below 80 eV and atomic photo-absorption cross-section data above 100 eV. Agreement between the results of the calculation for stopping power and the experimental data is within 10% for all ions when compared for energies greater than the Bragg peak. The discrepancy is larger below the peak due to limitations in the methodology, especially the failure to make corrections for the Barkas and higher order effects and the lack of charge cycling cross-section data.

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“…that the maximum formation of tetragonal zirconia is achieved at intermediate pH. The essentially amorphous powder removed from the autoclave after hydrothermal processing of aqueous zirconium(IV) acetate should be similar to that described as containing monoclinic zirconia nuclei (43). Alternatively the hydrolytic polymerization of aqueous [Zr(OH) ) 4H O]> , which is likely to occur in the autoclave, gives a relatively unstable tetragonal phase which transforms to the monoclinic polymorph under the temperature and pressure which exist during the hydrothermal processing.…”

Section: Zirconia Prepared By Hydrothermal Processing Of Zirconium(ivmentioning

confidence: 96%

The Influence of pH on Zirconia Formed from Zirconium(IV) Acetate Solution: Characterization by X-Ray Powder Diffraction and Raman Spectroscopy

Berry

Skinner

Bell

et al. 1999

Journal of Solid State Chemistry

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The local structure characterization and resulting phase-transition mechanism of amorphous ZrO2

Cited by 19 publications

References 16 publications

Mechanisms of room temperature metastable tetragonal phase stabilisation in zirconia

Mechanisms of room temperature metastable tetragonal phase stabilisation in zirconia

Inelastic cross-sections and energy loss properties by non-relativistic heavy ions in zirconium dioxide

The Influence of pH on Zirconia Formed from Zirconium(IV) Acetate Solution: Characterization by X-Ray Powder Diffraction and Raman Spectroscopy

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