Synthesis and optical properties of yttria-doped ZrO2 nanopowders

Yang, Huaming; Ouyang, Jing; Zhang, Xiaolong; Ning, Wang; Du, Chunfang

doi:10.1016/j.jallcom.2007.04.011

Cited by 34 publications

(12 citation statements)

References 38 publications

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“…Although we only have clearly detected the presence of the cubic zirconia-like phase in the case of samples (A ¼Y, x¼0.09, 0.12; A¼Sc, x¼0.12) prepared at a high temperature (T f ¼1573 K), the apparent absence of the revealing multiplet in the patterns of the corresponding samples prepared at relatively low temperature (973 K) might be due to experimental limitations: the closeness of these weak diffraction peaks, together with their expected comparatively larger widths (due to size effect), might mask the presence of the cubic phase. In fact, once confirmed its presence in the case of the 1573 K samples, and taking into account previous observations concerning the influence of the crystallite size in the cubic to tetragonal transformation in the Zr-containing oxide nanoparticles [41], what seems likely is the presence of the cubic phase in the samples prepared at 973 K. Raman spectroscopy provides us additional evidences on this point because it is sensitive to oxygen displacement in the cubic phase. Indeed, the Raman spectra of Y-doped samples (x ¼0.12) prepared at 973 and 1573 K look very similar (Fig.…”

Section: Resultssupporting

confidence: 78%

Large scale synthesis of nanostructured zirconia-based compounds from freeze-dried precursors

Gómez¹,

Villanueva²,

Vie³

et al. 2013

Journal of Solid State Chemistry

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a b s t r a c tNanocrystalline zirconia powders have been obtained at the multigram scale by thermal decomposition of precursors resulting from the freeze-drying of aqueous acetic solutions. This technique has equally made possible to synthesize a variety of nanostructured yttria or scandia doped zirconia compositions. SEM images, as well as the analysis of the XRD patterns, show the nanoparticulated character of those solids obtained at low temperature, with typical particle size in the 10-15 nm range when prepared at 673 K. The presence of the monoclinic, the tetragonal or both phases depends on the temperature of the thermal treatment, the doping concentration and the nature of the dopant. In addition, Rietveld refinement of the XRD profiles of selected samples allows detecting the coexistence of the tetragonal and the cubic phases for high doping concentration and high thermal treatment temperatures. Raman experiments suggest the presence of both phases also at relatively low treatment temperatures.

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Section: Resultssupporting

confidence: 78%

Large scale synthesis of nanostructured zirconia-based compounds from freeze-dried precursors

Gómez¹,

Villanueva²,

Vie³

et al. 2013

Journal of Solid State Chemistry

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“…Previous studies by Lopez et al showed that the energy bandgap of YSZ should lie between 4.17 eV and 3.74 eV [19,33]. Usually, ZrO 2 in the monoclinic form possess large energy bandgap E g ⩾ 6 eV which exhibits highly insulating properties and an active photon absorber [54]. French et al experimentally reported direct energy gap values E g is 6.1 eV for cubic-ZrO 2 single crystal stabilized with 9.5 mol% Y 2 O 3 [55].…”

Section: Optical Properties and Energy Bandgapmentioning

confidence: 99%

Cubic phase stability, optical and magnetic properties of Cu-stabilized zirconia nanocrystals

Pramanik

Singh

Joshi

et al. 2018

J. Phys. D: Appl. Phys.

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By means of experimental and ab initio investigations, we report on the cubic phase stability of Cu doped zirconia (ZrO2) at room temperature, and further characterize its structural, optical and magnetic properties. Various compositions of Zr1−xCuxO2 (0.01 ⩽ x ⩽ 0.25) nanocrystallites of average size ∼16 nm were synthesized using co-precipitation technique. Thermal analysis and kinetics of crystallization revealed that the cubic phase at ambient temperature can be stabilized by using a critical calcination temperature of 500 °C for 8 h in air and a critical composition of . For x < xc, some undigested monoclinic phase of ZrO2 exists together with the cubic structure. However, for x > xc, the monoclinic CuO emerges as a secondary phase with shrinkage of unit-cell volume with increasing the Cu content. At x = 0.05 and 500 °C calcination temperature, we observe a high degree of cubic crystallinity which breaks down into monoclinic phase with increasing calcination temperature beyond 550 °C. Electron magnetic resonance studies provide evidence for the substitution of Cu2+ (2D5/9,3d9) ions at Zr4+ sites with g, g and average ga = ( + 2)/3 ∼ 2.1. The temperature dependence of magnetic susceptibility measurements from 2 K to 300 K exhibits Curie–Weiss behaviour whose analysis using ga = 2.1 and spin S = 1/2 yields x = 0.028 and x = 0.068 for the nominal x = 0.05 and x = 0.20 samples, respectively. This magnetic analysis confirms the findings from x-ray diffraction that only a part of Cu is successfully doped into cubic phase of Cu-doped ZrO2. The optical bandgap decreases with increasing x, which is due to the emergence of Cu-d states at Fermi-level near the valence bands, thus making Cu-doped zirconia a hole doped (p-type) semiconductor.

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“…Oxygen atoms in doped solgel materials become quite mobile when the temperature is increased, hoping through the vacant sites producing a substantial ionic conductivity. This effect has interesting technological applications such as solid-state batteries, oxygen sensors, electrochemical oxygen pumps, and others [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Photo-quenched of the luminiscence signal in Co(II)-doped alumina prepared by the sol–gel method

Rodrı́guez¹,

Estévez²,

Vargas³

2011

Journal of Non-Crystalline Solids

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Synthesis and optical properties of yttria-doped ZrO2 nanopowders

Cited by 34 publications

References 38 publications

Large scale synthesis of nanostructured zirconia-based compounds from freeze-dried precursors

Large scale synthesis of nanostructured zirconia-based compounds from freeze-dried precursors

Cubic phase stability, optical and magnetic properties of Cu-stabilized zirconia nanocrystals

Photo-quenched of the luminiscence signal in Co(II)-doped alumina prepared by the sol–gel method

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