CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Kaichen Qian,Jiantai Fan,Zongyun Shen,Lulu Zhang,Xianglong Fan,Tao Feng,Weiwen Zhou,Minghui Feng,Benxue Jiang,Long Zhang
A citrate-nitrate combustion method was applied to synthesize fine composite Gd 2-x Y x O 3 -MgO (x = 0, 0.02, 0.2, 0.3, 0.4, 0.6) nanopowders . Y 2 O 3 substitution inhibited Gd 2 O 3 phase transition from cubic structure to monoclinic structure during sintering, thereby stabilizing its cubic structure to room temperature. This approach led to nanocomposite ceramics with a grain size of about 190 nm and increased the transmittance to 85% over the 3–5 μm wavelength range when x = 0.3. However, the addition of Y 2 O 3 weakened the mechanic properties of the nanocomposite ceramics.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Shanshan Li,Binglong Liu,Jiang Li,Xingwen Zhu,Wenbin Liu,Yubai Pan,Jingkun Guo
Yttria (Y 2 O 3 ) nano-powders were synthesized by the normal-strike precipitation method. The influences of R (NH 4 HCO 3 /M 3+ , molar ratio) and ammonium sulfate addition were studied throughout the preparation process. Several analytic techniques such as XRD , TG/DSC, SEM and FTIR were used to determine the characteristics of the precursors and Y 2 O 3 powders. It was found that morphologies and phases of the precursors were evidently influenced by the R value. The phases of the precursors were Y 2 (CO 3 ) 3 ·2.79H 2 O when R was 3–4, while the composition of the precursors with R = 4–5 was (NH 4 ) a Y(OH) b (CO 3 ) c ·xH 2 O. Homogeneous needle-flake shaped particles composed of coadjacent grains with diameters of about 70 nm were obtained as the R = 3–4. The rhombohedral flake-shaped particles were the products with R = 5–6. The mechanism of the influence of R value on the precipitation of the precursor was also investigated in this work. Pure Y 2 O 3 nano-powders were obtained by calcining the precursors at 1000 °C for 4 h regardless of what the R value was. Sulfate ions affect not only dispersion of nanopowders, but also their grain size. Results obtained in this work are contributed to the controllable synthesis of yttria powders.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 11
·6863-6871
·
IF 3.094
Xiaojun Tan,Shoulei Xu,Xiangyu Wang,Fenhong Liu,Bernard A. Goodman,Dingkang Xiong,Wen Deng
Single crystals of yttria-stabilized zirconia (YSZ) doped with various concentrations of Sm 2 O 3 were synthesized by the optical floating zone method, and their structure and spectroscopic properties characterized using powder X-ray diffraction (XRD), optical absorption, and luminescence measurements. XRD showed that the cubic phase of ZrO 2 was stabilized by addition of Y 2 O 3 and a series of absorption peaks characteristic of Sm 3+ was detected by UV-visible absorption spectroscopy. Three phenomenological J-O oscillator strength parameters Ω t ( t = 2, 4, 6) were calculated to evaluate the local structure and bonding in the vicinity of the Sm 3+ for the 0.75 mol% Sm 2 O 3 : YSZ sample. These were in order of Ω 2 < Ω 4 < Ω 6 with values of Ω 2 = 5.46 × 10 −20 cm 2 , Ω 4 = 10.70 × 10 −20 cm 2 , and Ω 6 = 12.67 × 10 −20 cm 2 , and indicate a relatively high symmetry and low covalent character for the Sm-O bond at the Sm 3+ sites in the YSZ matrix. Photoluminescence spectra recorded under an excitation of 404 nm showed four emission bands centered at 571 nm, 621 nm, 652 nm, and 716 nm corresponding to the transitions 4 G 5/2 → 6 H j ( j = 5/2, 7/2, 9/2, 11/2). The transition probability, lifetime, and branching ratio obtained from the emission spectrum of the 0.75 mol% Sm 2 O 3 : YSZ crystal showed that YSZ is a potential host for Sm 3+ to achieve a reddish-orange laser output, and the Sm 3+ -modified YSZ crystals have a possible use in reddish-orange laser and lighting devices.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 8
·2760-2768
·
IF 2.787
Xue Mao,Ying Bai,Jianyong Yu,Bin Ding
Polynanocrystalline yttria-stabilized zirconia (YSZ) nanofibrous membranes with robust flexibility and heat resistant were fabricated by a combination of electrospinning and heat-treatment process. The morphology and crystallographic structure of YSZ nanofibrous membranes were revealed and regulated by varying polymer composition in precursor solutions, which resulting in an effective control of mechanical properties from brittleness to robust tensile strength of 5.04 MPa. In addition, the relationship between the precursor composition and grain size is deeply discussed during the calcination process. Meanwhile, an inverse Hall–Petch effect of nanocrystalline materials was displayed on the YSZ nanofibrous membranes, due to the abundantly existence of ribbons. Furthermore, the flexible YSZ nanofibrous membranes with excellent bending resistance of 400 times and heat resistance of 1473 K exhibit high filtration efficiency of 99.996% for NaCl particles in the size range 300–500 nm, which suggested them to be promising candidate for high-temperature filtration fields including metallurgy, steel, electric power, incineration, cement industries, etc.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Ya-Zhe Xing,Yin-Ni Men,Xiao Feng,Ji-Hua Geng,Zhi-Rui Zou,Fu-Hua Chen
The effect of CuO addition on the microstructure and ionic conductivity of 8 mol% yttria-stabilized zirconia (8YSZ) were investigated. Undoped and 1 mol%, 1.5 mol%, 2 mol%, 2.5 mol% and 3 mol% CuO-doped 8YSZ bulks were prepared by sol-gel synthesis, cold pressing forming, and high-temperature sintering. The microstructure, phase composition , and ionic conductivity of the samples were characterized in detail to determine whether it could be used as alternative electrolyte material for the intermediate and low temperature solid oxide fuel cells. The results reveal that all samples present cubic zirconia. With increasing the CuO-doping content, the lattice parameter of the samples decreases, while the relative density of the samples increases from 66 to 85%, and the mean grain size increases from 0.90 to 2.63 μm. Furthermore, it is found that 2 mol% CuO doped 8YSZ possesses the minimum activation energy of 0.945 eV and the maximum AC ionic conductivity of 5.75 × 10 −2 S·cm −1 measured at 750 °C. The change in the ionic conductivity with the CuO-doping content is closely related to microstructural evolution and defect association in the materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ya-Nan Feng,Fei-Fan Wang,Weiwei Xiao,Yan Xia,Bin Wei,Shuaihua Wang,Zhonghua Deng,Fei-Fei Chen,Lingyun Li,Yan Yu
In this study, divalent calcium cation with large radius and trivalent yttrium cation with small radius were introduced to develop co-stabilized zirconia ceramics with both superior mechanical properties and aging resistance. Through a reverse coprecipitation-hydrothermal method, a series of ultrafine x CaO- y Y 2 O 3 -ZrO 2 ( x = 2.0, 3.0, y = 0.5, 1.0, 1.5, 2.0 ) raw powders with high quality were fabricated for the production of nanostructured ceramics via low-temperature pressurelessly sintering. The sintering process was optimized by investigating the effects of sintering temperature on densification, grain growth and phase evolution. The minimally doped 2.0 CaO- 0.5 Y 2 O 3 -ZrO 2 ceramic retained pure tetragonal phase at room temperature, achieving a balance of excellent toughness and high aging resistance. The impacts of chemical composition on microstructure, hardness, toughness and aging resistance were examined for these x CaO- y Y 2 O 3 -ZrO 2 ( x = 2.0, 3.0, y = 0.5, 1.0, 1.5, 2.0 ) ceramics. The segregation of calcium and yttrium cations at grain boundaries effectively tailored the microstructure. It was observed that substituting small trivalent yttrium cations for large divalent calcium cations effectively enhanced the aging resistance without sacrificing mechanical properties, due to the strengthened grain boundaries and asymmetrical distribution of cations among grains. This work not only produces low-doped zirconia ceramics with both excellent mechanical properties and aging resistance, but also presents straightforward method for preparation of high-quality raw powders and delicate microstructural engineering during sintering for developing advanced structural ceramics.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 4
·867-875
·
IF 1.385
Guo Xingzhong,Song Jie,Ren Jing,Yang Fanger,Kanamori Kazuyoshi,Nakanishi Kazuki
Yttria-stabilized zirconia monoliths with well-defined macropores and high porosity have been successfully fabricated via sol–gel process accompanied by phase separation. Propylene oxide acts as an acid consumer to mediate sol–gel process, and poly (ethylene oxide) is used to induce phase separation. Ethylene glycol is applied as chelating agent, and formamide serves as drying control chemical additive to inhibit cracking during drying stage. Proper proportion of the starting compositions allows the generation of well-defined macroporous YSZ monoliths with co-continuous skeletons and porosity as high as more than 60 %. The dried gels are amorphous and crystalline of ZrO 2 precipitates after heat treatment between 400 and 1200 °C without formation of monoclinic ZrO 2 , which indicating a wide application prospects.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PHASE TRANSITIONS
·
2024
·
IF 1.3
Chaoyan Wang,Dexin Liu,Tengyue Ma,Zhongchi Wang,Weiyan He,Jinrong Liu
BiYSZ, a Bi3+-doped yttria-stabilized zirconia with 4% molYO1.5, was synthesized using a lamellar liquid crystal template technique. The influence of different doping amounts of Bi3+ on crystal form, morphology and the ionic conductivity has been investigated in detail. In addition, the densification time of BiYSZ has been determined. Analytical techniques such as X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM) have been utilized to characterize the synthesized powders. The results reveal that BiYSZ, with its stable tetragonal phase and spherical nanostructure, benefits from Bi3+ doping in 4% mol YO1.5-stabilized zirconia, leading to enhanced ionic conductivity. Notably, the optimal formulation with 3 mol% Bi3+ and 4 mol% Y3+ in yttria-stabilized zirconia reaches a maximum ionic conductivity of 7.41 × 10−5 S/cm at 500°C. This formulation also reduces the sintering temperature by 100°C compared to 4YSZ and significantly improves conductivity by an order of magnitude.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Shoulei Xu,Xiaojun Tan,Fenhong Liu,Lei Zhang,Yuyang Huang,Bernard Albert Goodman,Wen Deng
Single crystals of yttria stabilized zirconia (YSZ) doped with different thulia (Tm 2 O 3 ) contents (0.2–3.0 mol%) (abbreviated to Tm 2 O 3 : YSZ) were grown by the optical floating zone method. The crystals were transparent and inclusion free. These samples were then analyzed by X-ray diffraction (XRD), thermogravimetric-differential thermal analysis (TG-DSC), and Raman spectroscopy , and their optical properties were determined with Ultraviolet–visible (UV–Vis) and Photoluminescence spectroscopy (PL). The Tm 2 O 3 : YSZ single crystals were in the cubic phase, and the lattice parameters first increased and then decreased with increasing Tm 2 O 3 content. The absorption spectra showed four peaks at around 356 nm ( 3 H 6 → 1 D 2 ), 460.5 nm ( 3 H 6 → 1 G 4 ), 678.5 nm ( 3 H 6 → 3 F 2,3 ) and 784 nm ( 3 H 6 → 3 H 4 ) in the visible region, and the optical bandgap energy increased with increasing Tm 2 O 3 content, as a result of the Moss-Burstein effect. Measurements of PL spectra indicated a strong blue emission peak at 458 nm ( 1 D 2 → 3 F 4 ), and three weak emission peaks at 487 nm ( 1 G 4 → 3 H 6 ), 497 nm ( 1 D 2 → 3 H 5 ), and 656.5 nm ( 1 G 4 → 3 F 4 ) when the crystals were excited by light with a wavelength of 356 nm. The intensities of the emission peaks were strongly affected by the Tm 2 O 3 content of the YSZ single crystals; the intensity increased with Tm 2 O 3 content at low doping levels, reached the maximum at 0.5 mol% Tm 2 O 3 , then decreased with further increase in Tm 2 O 3 content due to the concentration quenching effect. Additionally, the color changed from blue to cyan as the Tm 2 O 3 content was increased. Overall, this work demonstrates that the cubic YSZ single crystal is a suitable host material for solid state luminescence.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SCRIPTA MATERIALIA
·
2019
·
IF 4.539
Qiang Liu,Penghui Chen,Nan Jiang,Xing Zhang,Xiaoying Li,Sha Su,Zewang Hu,Haohong Chen,Tengfei Xie,Jiang Li
8.7 mol% Y 2 O 3 -ZrO 2 (Y 0.16 Zr 0.84 O 1.92 ) precursor was synthesized by the co-precipitation method using ammonia as the precipitant. The Y 0.16 Zr 0.84 O 1.92 powders calcined at 800 °C show a pure c-ZrO 2 phase. The average crystallite size of the powders is 12.4 nm and weakly agglomerated to an average particle size of 15.5 nm. Y 0.16 Zr 0.84 O 1.92 transparent ceramics were then successfully fabricated by pre-sintering at 1350 °C for 2 h and HIP post-treatment at 1750 °C for 1 h under 200 MPa without sintering additives. The in-line transmittance of Y 0.16 Zr 0.84 O 1.92 ceramics (1 mm thick) exceeds 50.3% in the region of 400–850 nm, reaching about 65.3% at 800 nm.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 7
·3727-3735
·
IF 3.108
Dandan Li,Yuchen Xie,Huaisong Yong,Dazhi Sun
We report the synthesis and tribological characterization of zirconia (ZrO2) nanoparticles in base mineral oil and commercial formulated lubricating oils. A modified chemical method was applied to prepare nano-sized ZrO2 structurally stabilized with yttria (Y2O3) in a precipitation process with the addition of various surfactants (polyethylene glycol, polyvinyl pyrrolidone, and polyether amine). Characterizations by X-ray diffraction and transmission electron microscopy show that polyether amine facilities the formation of stable ZrO2 with coexisting tetragonal and monoclinic phases and is better in preparing Y2O3-stabilized ZrO2 nanoparticles with a smaller particle size and narrower size distribution compared to the other surfactants used. The friction and anti-wear characteristics, which were tested with a four-ball module, indicate that the as-prepared Y2O3-stabilized ZrO2 nanoparticles perform better in commercial formulated lubricating oils than in the base mineral oil medium, and 0.1–0.5 wt% nanoparticles should be sufficient to achieve good tribological performance in lubricating oils.
研究领域:
材料科学
·
摩擦学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lei Wen,Chao Sui,Jiaxuan Li,Chenxi Zhao,Yushun Zhao,Junjiao Li,Gong Cheng,Xiaodong He,Chao Wang
Advanced hollow ceramic fiber materials with excellent thermal insulation and lightweight characteristics are urgently needed in rapidly developing areas such as aerospace. However, creating such hollow ceramic fiber materials has proven to be extremely challenging for current synthetic techniques. Here, we introduce a facile approach for the production of hollow yttria-stabilized zirconia (YSZ) fiber felts through sol–gel solution centrifugal spinning. It is found that the hollow structure can be effectively controlled by adjusting the mass ratios of inorganic salts and PVP, as well as the calcination temperatures. The resulting hollow YSZ felts exhibit low density (38 mg cm − 3 ), robust tensile strength (439.56±24.23 kPa), significant stretchability (>10 %), exceptional oxidation and high-temperature resistance, refractory properties, and outstanding thermal insulation characteristics (0.019 W m −1 K −1 at room temperature and 0.103 W m −1 K −1 at 1000℃). The successful synthesis of such fascinating materials may provide new insights into the design and development of hollow ceramic fibers.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）