Transition metals increase hydrothermal stability of yttria-tetragonal zirconia polycrystals (3Y-TZP)

Zhu, Wenliang; Fujiwara, Aiko; Nishiike, Naomichi; Marin, Elia; Sugano, Nobuhiko; Pezzotti, Giuseppe

doi:10.1016/j.jeurceramsoc.2018.03.042

Cited by 14 publications

(7 citation statements)

References 33 publications

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“…Figure 2 shows XRD patterns of the MeO (Fe 2 O 3 /CoO/NiO) co‐doped 3Y‐TZP specimens sintered at 1300°C for 2 h. The dopant content was 0.5 and 1.0 mol% that is within the solubility in tetragonal yttria‐stabilized zirconia solids 6,14,21 . Monoclinic phase (m) was found in the 1.0CoY‐TZP specimens, manifesting the t‐m phase transformation occurred.…”

Section: Resultsmentioning

confidence: 97%

“…However, the zirconia ceramics with t′ phase prepared by a fast‐cooling procedure usually show low fracture toughness K IC (~3 ± 0.3 MPa m 0.5 ) at low temperature [1], and gradually partition into tetragonal (t) and cubic (c) phases after a long‐term ageing at above 1250°C 4,5 . Recent progresses in multicomponent solid solutions based on zirconia 6–12 and high‐entropy fluorite oxides 13–18 show a satisfactory balance between mechanics and thermal properties as well as phase stability at 1500°C. Particularly, transition metal oxides with small radius (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

et al. 2021

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Multi‐element doped zirconia ceramics are of interest as a satisfactory balance in low thermal conductivity, phase stability, and particularly fracture resistance dominated by non‐transformable tetragonal prime phase (t′) for the next generation thermal barrier coatings and catalysis supports. Compared with mass and radius of dopants, dopant location is rarely investigated due to the high complexity. The undersized transition metal oxides (Fe, Co, and Ni) within 2.0 mol% content were selected for doping 3Y‐TZP to improve thermophysical properties by distinctive doping locations. As shown by X‐ray diffraction and Raman spectra, the Fe3+/Fe2+ ions occupied both substitution and interstitial sites simultaneously, which significantly increased tetragonality and local anisotropy of FeY‐TZP polycrystal. The t′ phase transformation mechanism of the FeY‐TZP compounds quantitatively discussed regarding the coercive strain and stress. In opposition to prediction by Kopp's law, the coefficient of thermal expansion and specific heat capacity of the FeY‐TZP compounds unusally decreased, and the maximum reduction of −83% and −22.5% occured in the 1.0 mol% Fe doping. Cp‐T dependency of the specimens above 550 K strongly related with lattice anisotropy in addition to t′ phase content. Thermomechanical properties of the multicomponent zirconia are highly tunable with dopant locations, supplying a novel landscape for designing high‐entropy ceramics.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

et al. 2021

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“…Raman spectroscopy is a nondestructive experimental technique for probing the vibrational and structural properties of materials. It is also recognized as a powerful tool for identifying different polymorphs of metal oxides 28 . According to group theory, the monoclinic ( m -ZrO 2 ), tetragonal ( t -ZrO 2 ), and cubic ( c -ZrO 2 ) phases of ZrO 2 are expected to have 18 (9 A g + 9 B g ), six (1 A 1 g + 2 B 1 g + 3 E g ) and one T 2 g Raman-active modes, respectively.…”

Section: Resultsmentioning

confidence: 99%

Anisotropic morphology, formation mechanisms, and fluorescence properties of zirconia nanocrystals

Qin¹,

Zhu²

2020

Sci Rep

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ZrO 2 nanocrystals with spheres and elongated platelets were systemically prepared through a simple hydrothermal method by the use of ZrOCl 2 ·8H 2 O and CH 3 COOK as raw materials. The anisotropic morphology and formation mechanism of the monoclinic and/or tetragonal ZrO 2 were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscope, and high-resolution transmission electron microscope techniques. The uniform elongated platelets and star-like structures were composed of short nanorods with a diameter of approximately 5 nm and a length of approximately 10 nm. The different morphologies were formed due to the different contents of CH 3 COO − and Cl − and their synergy. The fluorescence band position and the band shape remained about the same for excitation wavelengths below 290 nm and the different morphologies of the nanocrystals.

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“…For example, 8–9 mol% Y-stabilized zirconia (YSZ) for SOFC applications appears to be situated in the two-phase field (cubic + tetragonal) of the phase diagram at working temperatures, but coarsening of the tetragonal regions and decomposition on the cationic sublattice into Y-enriched and depleted regions on the nanoscale may induce electrical degradation (i.e., a lowered ionic conductivity) during operation [ 9 ]. Such undesirable environmentally dependent polymorphism in zirconia ceramics depends on type, fraction and distribution of dopants; grain size; grain boundary composition; and process control [ 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Annealing-Induced Off-Stoichiometric and Structural Alterations in Ca2+- and Y3+-Stabilized Zirconia Ceramics

et al. 2021

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In the current study, high-temperature stability was investigated in two types of zirconia ceramics stabilized with two different additives, namely, calcia and yttria. The evolutions of structure and oxygen-vacancy-related defects upon annealing in air were investigated as a function of temperature by combining X-ray diffractometry with Raman, X-ray photoelectron and cathodoluminescence spectroscopies. We systematically characterized variations in the concentration of oxygen vacancies and hydroxyl groups during thermal treatments and linked them to structural alterations and polymorphic transformation. With this approach, we clarified how the combined effects of different dopants and temperature impacted on structural development and on the thermal stability of the oxygen-vacancy-related defect complex.

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Transition metals increase hydrothermal stability of yttria-tetragonal zirconia polycrystals (3Y-TZP)

Cited by 14 publications

References 33 publications

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

Anisotropic morphology, formation mechanisms, and fluorescence properties of zirconia nanocrystals

Annealing-Induced Off-Stoichiometric and Structural Alterations in Ca2+- and Y3+-Stabilized Zirconia Ceramics

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Transition metals increase hydrothermal stability of yttria-tetragonal zirconia polycrystals (3Y-TZP)

Cited by 14 publications

References 33 publications

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe2O3‐Y2O3‐ZrO2 solid solutions

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe2O3‐Y2O3‐ZrO2 solid solutions

Anisotropic morphology, formation mechanisms, and fluorescence properties of zirconia nanocrystals

Annealing-Induced Off-Stoichiometric and Structural Alterations in Ca2+- and Y3+-Stabilized Zirconia Ceramics

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Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe₂O₃‐Y₂O₃‐ZrO₂ solid solutions