Journal of Materiomics
·
2023
·
IF 9.4
Jie Song,Peng Luo,Hailong Sun,Hezhang Li,Chao Wang,Yi Niu,Jing Jiang
Thermoelectric materials are competitive candidates for special cooling applications. Mg 3 Sb 2 -based materials consisting of inexpensive ingredients have profound thermoelectric properties. At present, alloying with Mg 3 Bi 2 is the most effective approach to optimize the thermoelectric properties of Mg 3 Sb 2 -based materials. However, the extremely low abundance of bismuth in the crust contradicts its economic expectation. In this work, the ZrO 2 micro-particles were separated into the Mg 3.2 Sb 1.99 Te 0.01 . The doping effect of Zr atoms at Mg sites increased the electrical conductivity, and the combined secondary phase lowered the lattice thermal conductivity. With acceptable degradation in the Seebeck coefficient, the sample combined with 5% (in mass) ZrO 2 exhibited a dimensionless figure of merit ( zT ) of 0.49 and a power factor of 2.7 mW·m −1 ·K −2 near room temperature. The average zT in the range from 300 K to 500 K reached 0.8, on par with the Mg 3 Sb 2 Mg 3 Bi 2 alloys. Besides, the compressive and bending strengths reach 669 MPa and 269 MPa, respectively, far superior to the common room-temperature thermoelectrics. This secondary phase showed a surprising and uncostly promotion of the Mg 3 Sb 2 -based thermoelectric materials, impelling the realization of its commercial application.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 17
·8139-8147
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IF 2.302
Sun W. Z.,Cheng J. G.,Huang Z. K.,Jiang Y.,Wu L. E.,Liu L. M.
When MgO+ZrO 2 were used as a sintering aid to SiC ceramics, it was found that ZrO 2 reacted with SiC and MgO to form ZrC and a magnesium silicate. This reaction may provide a new route to synthesize ZrC or prepare ZrC/SiC composites by reaction sintering using ZrO 2 , SiC, and MgO as starting materials. In the present work, formation process of the ZrC phase in the SiC–MgO–ZrO 2 system was addressed. Subsolidus phase relations at 1550 °C of the SiC–MgO–ZrO 2 system and the related SiC–SiO 2 –ZrC–ZrO 2 –MgO (Si–Zr–Mg–O–C) system were investigated.
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
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Benxue Liu,Xiaochan Liu,Xinfu Zhao,Huili Fan,Jing Zhang,Xibin Yi,Min Gao,Luyi Zhu,Xinqiang Wang
Polyacetylacetonatozirconium was used as the precursor to synthesize ZrO 2 aerogel (PAZ-ZrO 2 ). The physical properties of the aerogel were compared with those generated from zirconyl chloride (ZOC-ZrO 2 ) and zirconyl nitrate (ZON-ZrO 2 ). PAZ-ZrO 2 aerogel has higher compressive strength (0.12–0.23 MPa) with lower density (0.12 ± 0.005 g/cm 3 ) as compared to ZOC-ZrO 2 and ZON-ZrO 2 aerogel, of which the mechanical strengths are in the range of 0.02–0.15 MPa and the density of 0.13–0.17 g/cm 3 . After being treated at 1000 °C, the surface area (pore volume) of ZOC-ZrO 2 , ZON-ZrO 2 and PAZ-ZrO 2 aerogel are 210 m 2 /g (1.299 cm 3 /g), 223 m 2 /g (0.444 cm 3 /g) and 236 m 2 /g (1.568 cm 3 /g) respectively.
研究领域:
材料科学
·
纳米技术
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陶瓷
·
先进材料
✓ 已验证
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 12
·1823
·
IF 3.236
Rengui Weng,Feng Tian,Xin Huang,Guohong Chen
In this study, by adding zirconium anhydride (ZrO2) particles to a solution ofN–methylmorphorphine–N–oxide (NMMO) and bamboo cellulose (BC), we used interfacial polymerization (IP) to obtain regenerated cellulose nanofiltration membranes (IP–ZrO2/BC–NFMs) that exhibited high water flow and rejection of salts and dyes. During interfacial polymerization, anhydrous piperazine (PIP) was used as the waterborne monomer, and 1,3,5–trimesoyl chloride (TMC) and n–hexane were used as the organic phase. The procedure was adjusted by analyzing the impacts of the concentrations of the water and organic phase monomers and the reaction duration on the performance of the developed IP–ZrO2/BC–NFMs. The chemical structures and morphologies of the as–obtained IP–ZrO2/BC–NFMs were examined using various characterization techniques. The performance of these membranes for removal of inorganic salts and dyes as well as their water flow were investigated. IP–ZrO2/BC–NFMs obtained at a pressure of 0.5 MPa, PIP concentration of 1.5 wt.%, TMC concentration of 0.15 wt.%, and polymerization period of 2 min displayed the highest water flux (55.12 LMH) and the best desalination effect (NaCl rejection rate = 19.15%). Over 90% of both Methyl Blue (MB) and Congo Red (CR) dyes were intercepted. We demonstrated that the addition of ZrO2to nanofiltration membranes significantly enhanced the water flow of the IP–ZrO2/BC–NFMs as well as the salt ion rejection rate.Keywords:regenerated cellulose;nanofiltration membrane;rejection rate;interfacial polymerization
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jingkai Zhou,Gang Qu,Dandan Huang
A comprehensive phase equilibria investigation was conducted in the Gd 2 O 3 - NiO - ZrO 2 system and its binary subsystems (Gd 2 O 3 - NiO and NiO - ZrO 2 ) at 1773 K and 1573 K via solid-phase reaction approach. The NiO - ZrO 2 binary system was initially studied between 1373 K and 1773 K, and the decreased martensitic transition temperatures (1236 K) were determined, confirming Ni 2+ stabilization of t'-ZrO 2 . Homogeneity ranges for Gd 3+ and Zr 4+ in NiO demonstrated minimal temperature dependence. No intermetallic compounds were observed in these subsystems, but a new ternary compound NiO·ZrO 2 ·3Gd 2 O 3 (τ) was identified in the ternary system. Isothermal phase equilibria of the ternary system revealed extended three-phase regions (T + Fl + Hl, Fl + C+ τ etc.) and solubility variations with temperature. Based on experimental data and literature assessments, phase diagrams for the subsystems and ternary isothermal sections were constructed with high reliability.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jianqiang Ye,Buming Chen,Shixing Wang
The zinc electrowinning process demands considerable energy, prompting the quest for energy-efficient solutions to curtail costs. Hence, the development of energy-saving anode materials for zinc hydrometallurgy is an important issue. Herein, multilayered PbO 2 film materials were prepared through thermal decomposition and composite electrodeposition, yielding a new PbO 2 –ZrO 2 electrode featuring ZrO 2 particles as the second phase for energy-saving zinc electrowinning. The introduction of ZrO 2 leads to reduced PbO 2 crystal size, heightened the specific surface area of the electrode, and preferential growth of crystal planes. Electrochemical tests underscore that the PbO 2 –ZrO 2 electrode manifests a reduced charge-transfer resistance ( R ct ) and overpotential alongside a 46.15 % extension in service life compared to the pure PbO 2 electrode. Simulated zinc electrowinning experiment affirms PbO 2 –ZrO 2 electrode has a 3.63 % surge in the current efficiency and a substantial 244.61 kWh/t reduction in energy consumption relative to the traditional Pb–0.6wt%Ag anode. This study provides a strategic framework for designing and developing cost-efficient, cost-effective anode materials, promoting advancements in energy conservation and consumption reduction within zinc electrowinning processes.
研究领域:
材料科学
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电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Yanbing Sun,Yuanyuan Wei,Jiaying Pei,Huarui Nan,Youqun Wang,Xiaohong Cao,Yunhai Liu
Synthesizing highly efficient adsorbent materials to remove U(VI) from contaminated water remains a major challenge. Here, using UiO66-NH 2 as a sacrificial template, porous carbons (ZrO 2 @PCs) were prepared by high-temperature calcination , and then a simple strategy was used for phosphorylation modification to prepare the target product ZrO 2 @PCs-PO 4 . The microscopic surface morphology and structure of ZrO 2 @PCs-PO 4 characterized by SEM, FT-IR and XRD reveals that phosphate groups has been successful introduced on the surface of ZrO2@PCs-PO 4 . Batch experimentation showed that the phosphorylation process improves the adsorption behaviors , and the maximum monolayer adsorption capacity for U(VI) is 496.5 mg/g. The adsorption isotherms and kinetics were simulated to explore its adsorption mechanism. The excellent selectivity and reusability ensure this material could apply in selective removal of U(VI) ions.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
·
2020
·Vol. 51
·期 10
·5328-5338
·
IF 2.05
Zou Yongshun,Gu Huazhi,Huang Ao,Fu Lvping
Sintered magnesia refractories combined by in situ intergranular CaZrO 3 phases were synthesized using natural MgO-containing natural minerals with CaO and SiO 2 impurities and nano-sized ZrO 2 additive. A homogenous distribution of intergranular CaZrO 3 , independent from the intergranular CaO-MgO-SiO 2 phases, was formed in situ within the sintered magnesia aggregates by introducing 0.75 wt pct nano-sized ZrO 2 into the magnesite. The formation mechanism of the in situ intergranular CaZrO 3 phases was determined. The nano-sized ZrO 2 was introduced and uniformly distributed at grain boundaries of the magnesia due to the micron-nano-sized particles composite system and wetting grinding process. Then the CaO in impurities were prior to SiO 2 to react with the ZrO 2 for generating CaZrO 3 at the grain boundaries by increasing sintering temperature. Nevertheless, the nano-sized ZrO 2 particles were encapsulated in the MgO crystallites with similar particle size decomposed from brucite and prevented from reacting with CaO impurities in magnesite. The mixing homogeneity of magnesite particles and ZrO 2 particles and the direct contact between ZrO 2 and CaO impurities in magnesite has a crucial effect on the formation of intergranular CaZrO 3 phases. Furthermore, the intergranular CaZrO 3 phases could enhance the bonding of magnesia grains and have great potential for improving the service performance of magnesia.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 14
·7645-7651
·
IF 3.049
Xin Wang,Min Xue,Songbai Liu,Kuo Jiang,Zhuli Zhang
Herein, powders composed of La2Zr2O7 (LZ) and ZrO2 phases were synthesized by an in situ reaction using a sol-spray pyrolysis method; moreover, 24 mol% LaO1.5–ZrO2 (volume ratio = 1 : 1) powders were characterized by XRD, Raman spectroscopy, SEM, and TEM. XRD and Raman results showed that the samples maintained a tetragonal ZrO2 and a pyrochlore LZ phase from 900 to 1100 °C. The addition of LZ could be helpful in the stabilization of t-ZrO2 and decreasing the grain size of ZrO2. The SEM results revealed that the LZ and ZrO2 phases were homogeneously distributed in the sintered bulk. The HRTEM results suggested that the crystal orientations of the nano-LZ and nano-ZrO2 phases were accordant; this was in agreement with the characteristics of the coherent boundaries. The fracture toughness of LZ–ZrO2 was markedly improved by the transformation toughening of the ZrO2 phase, and a value that was 2.2-fold that of the LZ prepared by a similar technique was achieved.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Materials Science
·
2024
·
IF 12.6
Weiwei Qi,Lan Xiang,Mingqiang Ning,Tao Liu,Yuanyuan Li,Xueheng Zhuang,Ganggang Lv,Qiang Wu,Guoguo Tan,Qingzheng Jiang,Qikui Man,Baogen Shen
With the increasing requirements of electromagnetic wave (EMW) absorption, developing EMW absorbers with high-efficiency anti-corrosion performance which can be effectively applied in extreme corrosive environments is imperative and constitutes a hot issue in the current research. Herein, based on the composition modulation of ZrO 2 and SiO 2 layer, the dual-oxides confined carbonyl iron (CI@ZrO 2 /SiO 2 ) composite displays a minimum reflection loss ( RL min ) of −48.58 [email protected] mm and an effective absorption bandwidth (EAB) of 7.62 [email protected] mm. Besides, the CI@ZrO 2 /SiO 2 displays superior corrosion resistance with corrosion current density ( i corr ) of 8.62 × 10 −7 A/cm 2 and polarization resistance ( R p ) of 3.64×10 5 Ω. This work proposes a strategy to optimize the broadband EMW absorption properties as well as the mass production toward the corrosion resistance applications.
研究领域:
材料科学
·
电磁学
·
腐蚀科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Guixian Deng,Guifang Zhang,Xing Zhu,Qingjie Guo,Xiangbiao Liao,Xi Chen,Kongzhai Li
Reduction of CO 2 in presence of oxidative impurity ( e.g. , O 2 ) is more promising than utilization of pure CO 2 due to skyrocketing cost for purification of captured CO 2 from air or industrial exhaust gas. In this work, Ni-based catalysts are modified by CeO 2 and ZrO 2 to suppress negative effect of O 2 on reforming of CO 2 with methane, which show high CH 4 conversion (97 %) and CO 2 conversion (95 %) at 750 °C and can maintain high CO 2 conversion even with high O 2 content. The physicochemical characterizations on fresh and spent catalysts show that the interaction among Ni, CeO 2 and ZrO 2 results in well dispersion of smaller Ni particles, even after long-term testing. In situ DRIFTS results show that Ni/CeO 2 -ZrO 2 -SiO 2 catalyst shows advantage to activate CH 4 to generate active CH 3 *, promoting the formation of CO, and the CeO 2 -ZrO 2 solid solution improves the CO 2 adsorption, thereby reducing the competitive effect of CO 2 and O 2 .
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Liyu Chen,Jiaxin Yang,Youjian Yang,Yifan Zhang,Zhaowen Wang
In this study, we investigated the thermodynamics and kinetics of the aluminothermic reduction of ZrO 2 . The results of thermal analysis and isothermal heat treatment showed that the aluminothermic reduction of ZrO 2 was an exothermic reaction that occurred at . 958.8°C. The aluminothermic reduction process does not produce metal Zr, but when the stoichiometric number of Al:ZrO 2 was 13:3, Al 3 Zr and Al 2 O 3 can be obtained by the reaction. The activation energy of the reaction was 1589.89 kJ/mol, and the reaction order was 1.90. The aluminothermic reduction process and mechanism of ZrO 2 in the presence of potassium cryolite as the molten salt medium was also studied. The results showed that ZrO 2 dissolved in potassium cryolite molten salt and participated in the reduction reaction in the form of Zr–O–F complex ions, while the by–product Al 2 O 3 also dissolved in potassium cryolite to further promote the formation of the Al–Zr alloy.
研究领域:
冶金学
·
材料科学
✓ 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）