Powder diffraction investigations of plasma sprayed zirconia

Bondars, B.; Heidemane, Gundega; Grabis, Jānis; Laschke, K.; Boysen, H.; Schneider, J.; Frey, Friedrich

doi:10.1007/bf00375275

Cited by 141 publications

(81 citation statements)

References 18 publications

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“…66782 and No. 86603 referring to tetragonal structure [45][46][47]. Therefore, all the 3Y-PSZ nonsintered and sintered ceramics exhibited characteristic diffraction peaks corresponding to an ordered structure at a long range.…”

Section: Resultsmentioning

confidence: 95%

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Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Mendes

Costa

Araújo

et al. 2017

Materials Science-Poland

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In this work, the effect of sintering parameters on electronic structure and physical properties of yttria-partially stabilized ZrO 2 (YPSZ) commercial ceramics has been studied using the central composite design (CCD) method. The CCD method allows using empirical modelling with better fitting, by considering the interaction between both factors. Different temperature ranges and sintering times for processing of YPSZ ceramics have been used in order to evaluate the grain growth, hardness and volumetric shrinkage by the CCD method. X-ray diffraction patterns and Rietveld refinement data indicate that non-sintered YPSZ ceramics exhibits two phases related to tetragonal and monoclinic structures, while the sintered YPSZ ceramics exhibits a single phase related to a tetragonal structure. Moreover, the monoclinic structure presents zirconium (Zr) atoms coordinated to seven oxygen (O) atoms, while in the tetragonal structure Zr atoms are coordinated to eight O atoms. Field emission scanning electron microscopy images were employed to monitor the sintering and growth process. In addition, the response surfaces obtained from calculations presented the effect of thermal and kinetic variables on the physical properties such as average grain size, volumetric shrinkage and hardness of YPSZ ceramics.

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Section: Resultsmentioning

confidence: 95%

“…This behavior is due to increased temperature and time of sintering of the 3Y-PSZ ceramics which was indexed with the CIF file No. 66782 [46].…”

Section: Rietveld Refinement Analysismentioning

confidence: 99%

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Mendes

Costa

Araújo

et al. 2017

Materials Science-Poland

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“…This problem can be solved by modifying zirconium nanoparticles with acids such as sulphates (Shao et al, 2006;Xu et al, 2005;Adamski et al,2008;Mekhemer & Ismail, 2000;Jiao et al, 2003) and phosphates (Ray et al, 2000) to yield solid acids of a wide range of strengths. This acid-modified zirconia has been found to increase water retention, improve proton conductivity and reduce the methanol crossover in the membrane Bondars et al, 1995;Chuah et al, 2001) and be more stable than other solid super acids .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of zirconia-based solid acid nanoparticles for fuel cell application

Sigwadi

Mavundla

Moloto

et al. 2016

J. energy South. Afr.

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Zirconia nanoparticles were prepared by the precipitation and ageing methods. The precipitation method was performed by adding ammonium solution to the aqueous solution of zirconium chloride at room temperature. The ageing method was performed by leaving the precipitate formed in the mother liquor in the glass beaker for 48 hours at ambient temperatures. The nanoparticles from both methods were further sulphated and phosphated to increase their acid sites. The materials prepared were characterised by X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), Brunauer-EmmettTeller (BET), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) methods. The XRD results showed that the nanoparticles prepared by the precipitation method contained mixed phases of tetragonal and monoclinic phases, whereas the nanoparticles prepared by ageing method had only tetragonal phase. The TEM results showed that phosphated and sulphated zirconia nanoparticles obtained from the ageing method had a smaller particle size (10-12 nm) than the nanoparticles of approximately 25-30 nm prepared by precipitation only. The BET results showed that the ZrO 2 nanoparticles surface area increased from 32 to 72 m 2 /g when aged.

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“…8 In this structure, edge-sharing polyhedra are formed by seven-fold coordinated Zr atoms. For tetragonal zirconia, 9 displayed in Figure 1(b), the coordination number of Zr increases by one, resulting in distorted cubes. Cubic zirconia (Figure 1(c)), exhibiting the CaF 2 structure, also features cubically coordinated zirconium atoms (undistorted).…”

Section: Introductionmentioning

confidence: 99%

From zirconia to yttria: Sampling the YSZ phase diagram using sputter-deposited thin films

et al. 2016

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Yttria-stabilized zirconia (YSZ) thin films with varying composition between 3 mol% and 40 mol% have been prepared by direct-current ion beam sputtering at a substrate temperature of 300 °C, with ideal transfer of the stoichiometry from the target to the thin film and a high degree of homogeneity, as determined by X-ray photoelectron and energy-dispersive X-ray spectroscopy. The films were analyzed using transmission electron microscopy, revealing that, while the films with 8 mol% and 20 mol% yttria retain their crystal structure from the bulk compound (tetragonal and cubic, respectively), those with 3 mol% and 40 mol% Y2O3 undergo a phase transition upon sputtering (from a tetragonal/monoclinic mixture to purely tetragonal YSZ, and from a rhombohedral structure to a cubic one, respectively). Selected area electron diffraction shows a strong texturing for the three samples with lower yttria-content, while the one with 40 mol% Y2O3 is fully disordered, owing to the phase transition. Additionally, AFM topology images show somewhat similar structures up to 20 mol% yttria, while the specimen with the highest amount of dopant features a lower roughness. In order to facilitate the discussion of the phases present for each sample, a thorough review of previously published phase diagrams is presented.

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Powder diffraction investigations of plasma sprayed zirconia

Cited by 141 publications

References 18 publications

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Synthesis of zirconia-based solid acid nanoparticles for fuel cell application

From zirconia to yttria: Sampling the YSZ phase diagram using sputter-deposited thin films

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Powder diffraction investigations of plasma sprayed zirconia

Cited by 141 publications

References 18 publications

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO2 commercial ceramics

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO2 commercial ceramics

Synthesis of zirconia-based solid acid nanoparticles for fuel cell application

From zirconia to yttria: Sampling the YSZ phase diagram using sputter-deposited thin films

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Product

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Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics