Microstructure characteristics of ultra-fine ZrO2Y2O3 ceramic powders

Winnubst, Louis; Zevert, W.F.M. Groot; Theunissen, G.S.A.M.; Burggraaf, A.J.

doi:10.1016/0921-5093(89)90590-x

Cited by 19 publications

(6 citation statements)

References 3 publications

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“…The nano-particles for our in-situ experiment were prepared by a water-based solgel technique [13,14] The accurate position of the Zr-K absorption edge was determined by scanning the edge before heating began. For comparison, a thin foil of zirconium metal was also edge-scanned (cf.…”

Section: Methodsmentioning

confidence: 99%

Energy-dependentin situsmall-angleX-ray scattering study of nano-ceramics

Winter

Messurier

Martin

2006

Crystallography Reviews

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Energy-dependent small-angle x-ray scattering (SAXS) measurements near the Zr-K absorption edge of a nano-scale alumina-zirconia-silicate ceramic are reported.The in-situ experiments cover the temperature range from 250 • C to 725 • C, during which the sol-gel prepared nano-particles consolidate and the glass matrix phase begins to soften, leading to a compaction of the ceramic. The dominant scattering mechanism changes from a surface-fractal type to a mass-fractal type linked to direct contact areas between nano-particles and matrix. The energy-dependent data identify the zirconium-bearing phase as dominant in the high-q range. The experimental data are placed in the context of recent advances in in-situ anomalous small-angle x-ray scattering (ASAXS) and some experimental problems and solutions of near-edge scattering are discussed.

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Section: Methodsmentioning

confidence: 99%

Energy-dependentin situsmall-angleX-ray scattering study of nano-ceramics

Winter

Messurier

Martin

2006

Crystallography Reviews

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“…With the co-precipitate method, Y 2 O 3 -stabilized ZrO 2 powders in the cubic structure have been directly synthesized, and the particle size is uniform. [17,18] As another state parameter that is independent of temperature and chemical composition, pressure tunes the physical properties of materials by compressing the distance between atoms and modifying the electronic structures. [19,20] The phase transitions of ZrO 2 under high pressure have been studied systematically with various techniques.…”

Section: Introductionmentioning

confidence: 99%

Isostructural phase transition-induced bulk modulus multiplication in dopant-stabilized ZrO₂ solid solution*

Wang

Shen

et al. 2019

Chinese Phys. B

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The electrical transport properties and structures of Y2O3/ZrO2 solid solution have been studied under high pressure up to 23.2 GPa by means of in situ impedance spectroscopy and x-ray diffraction (XRD) measurements. In the impedance spectra, it can be found that the pressure-dependent resistance of Y2O3/ZrO2 presents two different change trends before and after 13.3 GPa, but the crystal symmetry still remains stable in the cubic structure revealed by the XRD measurement and Rietveld refinement. The pressure dependence of the lattice constant and unit cell volume shows that the Y2O3/ZrO2 solid solution undergoes an isostructural phase transition at 13.1 GPa, which is responsible for the abnormal change in resistance. By fitting the volume data with the Birch–Murnaghan equation of state, we found that the bulk modulus B 0 of the Y2O3/ZrO2 solid solution increases by 131.9% from 125.2 GPa to 290.3 GPa due to the pressure-induced isostructural phase transition.

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“…As well known, powder characteristic has great effect on properties of the final ceramic products. Ceramic powder consisting of microparticles (one‐tenth to several micrometres) with spherical morphology and narrow size distribution possesses low sintering temperature, high packing density and uniform microstructure [13, 14]. Monodisperse can further enhance sintering ability at lower temperatures [15, 16], and the as‐prepared ceramics possess smaller residual pores and grain sizes if an appropriate technology process is carried out.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of monodisperse ZrO ₂ microspheres via urea homogeneous precipitation and its effect on the sintering properties

Tong

Zhao

Wang

2019

Micro & Nano Letters

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Monodisperse zirconia microspheres were prepared by homogeneous urea precipitation method. The effect of reaction time, reaction temperature and other synthetic parameters on the dispersion of the product was investigated in this experiment. The as-prepared zirconium oxide (ZrO 2) powders were characterised by X-ray diffraction, Brunauer-Emmett-Teller analysis, field emission-scanning electron microscopy and Fourier-transform infrared spectroscopy. The experimental results show that the size and dispersion of ZrO 2 microspheres can be controlled by changing the concentration of polyvinylpyrrolidone (PVP). The size of ZrO 2 microspheres is changed from 120 nm to 1 μm with the increase of PVP concentration. When the reaction temperature is raised to 90°C and the reaction time is reached to 2 h, the monodisperse ZrO 2 microspheres with a diameter of 120 nm are finally prepared. ZrO 2 ceramics possessed an ultrafine, uniform microstructure and a narrow pore size distribution, and the grain size increased from 72 to 190 nm with the increase of sintering temperature. Moreover, when ZrO 2 ceramics were sintered at 950°C for 2 h, the theoretical density was up to about 98% (a density of 5.65 g/cm 3), which is higher than that of conventional ZrO 2 ceramics.

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Microstructure characteristics of ultra-fine ZrO2Y2O3 ceramic powders

Cited by 19 publications

References 3 publications

Energy-dependentin situsmall-angleX-ray scattering study of nano-ceramics

Energy-dependentin situsmall-angleX-ray scattering study of nano-ceramics

Isostructural phase transition-induced bulk modulus multiplication in dopant-stabilized ZrO₂ solid solution*

Synthesis of monodisperse ZrO ₂ microspheres via urea homogeneous precipitation and its effect on the sintering properties

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Microstructure characteristics of ultra-fine ZrO2Y2O3 ceramic powders

Cited by 19 publications

References 3 publications

Energy-dependentin situsmall-angleX-ray scattering study of nano-ceramics

Energy-dependentin situsmall-angleX-ray scattering study of nano-ceramics

Isostructural phase transition-induced bulk modulus multiplication in dopant-stabilized ZrO2 solid solution*

Synthesis of monodisperse ZrO 2 microspheres via urea homogeneous precipitation and its effect on the sintering properties

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Product

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Isostructural phase transition-induced bulk modulus multiplication in dopant-stabilized ZrO₂ solid solution*

Synthesis of monodisperse ZrO ₂ microspheres via urea homogeneous precipitation and its effect on the sintering properties