JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 9
·e20693
·
IF 3.8
Yanhao Song,Xiuhua Ji,Kui Tang,Yihao Zhang,Tongshen Xu,Shiyin Ji,Tao Duan
Zirconolite and pyrochlore are recognized as the promising candidates for HLW immobilization because of their excellent chemical durability, radiation resistance and so on. In this study, the nominal CaZr 1- x Sm x Ti 2- x Nb x O 7 ( x = 0.1–1.0) compounds were synthesized to explore their microstructure, phase evolution and chemical durability. The X-ray diffraction (XRD), back-scattered scanning electron microscopy with energy dispersive X-Ray spectrometry (BSEM-EDS) and Raman analysis results displayed that the phase transformation was two-layer to four-layer monoclinic zirconolite (2M to 4M) and then to cubic pyrochlore with concentration of Sm 3+ and Nb 5+ raising. The crystalline structure evolution of 2M to 4M zirconolite and zirconolite-4M to cubic pyrochlore were determined firstly at x = 0.2 and x = 0.3 sample, respectively. Zirconolite-4M with trace perovskite was prepared at x = 0.2 sample. Near single-phase pyrochlore would be obtained when x ≥ 0.4. Moreover, the chemical durability of zirconolite-4M was stronger than zirconolite-2M and the composite of zirconolite-4M and pyrochlore. The findings could be helpful for the design of zirconolite-based waste forms for actinides such as Np 3+ , Am 3+ , and others.
研究领域:
材料科学
·
核废物处理
·
无机非金属材料
·
固态化学
·
放射化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Hang Qin,Wenming Guo,Xin Huang,Pengzhao Gao,Hanning Xiao
8 mol% yttria-stabilized ZrO 2 (8YSZ) nanofiltration (NF) membranes were prepared from size-controlled spherical ZrO 2 nanoparticles with an average diameter of ˜10 nm and a particle roundness value greater than 0.90, and the nanoparticles were efficiently fabricated by a reverse micelles (RMs)-mediated sol-gel process. It was found that yttria doping not only suppressed the tetragonal to monoclinic (t-m) phase transition, ensuring the membranes integrity, but also decreased the tetragonal grain size, increased the specific surface area, narrowed the pore size distribution and thus optimized the NF performance. The as-prepared 8YSZ NF membranes with a thickness of ˜260 nm exhibited high NF performances, while the pure water permeability and molecular weight cut-off (MWCO) were 3.9-4.2 L m −2 h -1 bar -1 and 800 ± 50 Da respectively. In the treatment of pesticide wastewater, the removal rate of carbofuran by 8YSZ NF membranes was more than 82%, while the maximum removal rate could reach 89%. Furthermore, the contaminated membranes could be restored as ever after alkali wash and low-temperature calcination , implementing multiple reuses.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Gang Qu,Jingkai Zhou,Dandan Huang
The phase relationships of the ternary system Eu 2 O 3 - La 2 O 3 - ZrO 2 and binary Eu 2 O 3 - La 2 O 3 subsystem were experimentally and thermodynamically studied. Six three-phase fields and nine two-phase ones in the Eu 2 O 3 - La 2 O 3 - ZrO 2 system were investigated by X-ray diffraction, scanning electron microscopy and electron probe microanalysis with wavelength dispersive spectrometer at 1873 K and 1673 K. Nevertheless, there only existed a two-phase region in the Eu 2 O 3 - La 2 O 3 system in the temperature range from 1873 K to 1673 K. After that, the ternary mixing parameters for the system Eu 2 O 3 - La 2 O 3 - ZrO 2 including the binary interaction parameters in the Eu 2 O 3 - La 2 O 3 subsystem are optimized with the CALPHAD (CALculation of PHAse Diagrams) method, based on obtained experimental results. The high-temperature phase relationships and the special type of continuous solid solutions (La 2-x Eu x Zr 2 O 7 ) investigated in present work will contribute to exploring new materials with specific properties such as optical transparency.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2017
·
IF 2.605
She Chen,Zhifeng Zhang,Shengting Kuang,Yanling Li,Xiaowen Huang,Wuping Liao
A new extractant, bis(2-ethylhexyl)-1-(2-ethylhexylamino)propylphosphonate (BEAP or B) was synthesized to extract and separate zirconium and hafnium from sulfate medium. Under optimum conditions, the separation factor of Zr over Hf was found to be 6.8. The extracted complexes were determined to be ZrO(HSO 4 ) 2 ·3B and HfO(HSO 4 ) 2 ·2B. The extractions of zirconium and hafnium are both exothermic. A counter-current operation was conducted, in which the content of HfO 2 was decreased from 3% to 0.6% in the ZrO 2 product. It is suggested that much more extraction and scrubbing stages are needed to reach the goal of 0.01% HfO 2 in ZrO 2 product.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2023
·Vol. 34
·期 7
·1003-1012
·
IF 1.4
Wang Junlian,Liu Hui,Xu Wen,Chang Ziyong,Wang Peilong,Wang Huajun
Designing highly efficient dialkylphosphinic acid extractant for zirconium/hafnium separation relies on systematic structure-property studies. In this paper, dialkylphosphinic acids with different substituents at β-C, γ-C and δ-C for zirconium and hafnium extraction and separation from H2SO4 media were investigated. The results show that substituents at β-C, γ-C and δ-C reduce the extraction ability of dialkylphosphinic acids for both zirconium and hafnium. The substituent effect at β-C is greater than that at γ-C and δ-C. The larger steric hindrance of the substituents (ethyl > methyl > H), the weaker extraction ability of the dialkylphosphinic acids. The zirconium and hafnium separation behavior is related to the extraction ability of dialkylphosphinic acids. Dialkylphosphinic acids with stronger extraction ability show better zirconium/hafnium separation performance at higher acidity of 2.0 mol L-1 H2SO4, while those with weaker extraction ability show better zirconium and hafnium separation performance at lower acidity of 0.25 mol L-1 H2SO4. The highest hafnium/zirconium separation factor (βHf/Zr) in the current study occurs with (2-ethylhexyl)(2,4,4-trimethylpentyl)phosphinic acid (USTB-1), which reaches 19.2.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Hongju Qiu,Yanqiong Zhang,Weiwei Huang,Jinhui Peng,Jin Chen,Lei Gao,Mamdouh Omran,Nan Li,Guo Chen
Tetragonal zirconia nanopowders (3Y-TZP NPs) stabilized by 3 mol % Y2O3 were synthesized by a novel sol–gel–flux method. The effects of calcination temperature, Y2O3 content, and molten salt system (NaCl + KCl binary system and NaCl unary system) on the phase composition and morphology of nanopowders (NPs) were investigated. Meanwhile, the sintering properties of the prepared 3Y-TZP NPs were studied. The 3Y-TZP NPs and sintered ceramics were characterized by thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) analysis, and X-ray fluorescence (XRF) spectroscopy. The results show that the optimum calcination temperature for obtaining dispersed ZrO2 NPs is reduced from 800 to 660 °C when the NaCl unary system is substituted by the NaCl + KCl binary system. 3Y-TZP NPs with a single tetragonal phase are obtained in the NaCl + KCl binary system when Y2O3 content in the raw material is 5 mol %. The average particle size of the obtained ZrO2 NPs is reduced from 47.25 nm in the unary system to 26.18 nm in the binary system because of the lower calcining temperature. Furthermore, the 3Y-TZP NPs obtained in the binary system have narrower particle size distribution and better sintering performance than ZrO2 NPs obtained in the unary system. After sintering for 4 h at 1200 °C, the former generated 3Y-TZP ceramics with higher density and finer grain size. This work produced narrow-distributed well-dispersed 3Y-TZP NPs with quasi-spherical morphology, which are good candidates for the applications, including oxygen sensors and thermal barrier coatings.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 43
·期 16
·14176-14182
·
IF 2.986
Lin Wang,Benxue Liu,Luyi Zhu,Yongshuai Xie,Yadong Lv,Chonghe Xu,Xiaotong Jin,Xinqiang Wang,Guanghui Zhang,Dong Xu
Polyaceticzirconium (PEZ) sol, which is the precursor of zirconia (ZrO 2 ) continuous fibers, has been synthesized by means of the reaction between zirconium oxychloride octahydrate (ZrOCl 2 ·8H 2 O) and potassium acetate (CH 3 COOK) in methanol. The polymeric structures and the rheological behaviors of the sols with different molar ratios of ZrOCl 2 ·8H 2 O/CH 3 COOK are different and would affect the spinnability and stability significantly. Herein, the polymeric structures and rheological behaviors of the PEZ sols with the molar ratios of 1:1, 1:1.5, 1:1.8 and 1:2 were investigated by Fourier transform infrared (FT-IR), 1 H nuclear magnetic resonance spectrum ( 1 H-NMR), thermogravimetry and differential thermal analysis (TG/DTA) and rheological measurements. The results showed the carboxyl group acted as a chelating ligand instead of bidentate ligand, and the water molecule coordinated to Zr 4+ was deprotoned gradually with the decrease of the molecular ratios. The different polymeric structures lead to a different rheological behaviors of the sols. It is divided into three types, the Newton fluid with a low viscosity produced by the charged linear polymeric structures, the shear thinning fluid with a high viscosity produced by the three-dimensional polymeric structures and the shear thinning fluids with a proper viscosity produced by the linear twining polymeric structures. Through the experimental guidance, we successfully synthesized a sol with suitable viscosity and stability, and used it to fabricate high quality ZrO 2 fibers.
研究领域:
材料科学
·
无机化学
·
高分子化学
·
纤维工程
·
溶胶-凝胶技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jianzhong Ma,Tongtong Ma,Qianqian Fan,Yiming Shen,Mi Liu,Wenbo Zhang
The development of green chromium-free tanning agents continues to be actively researched as a prominent topic in the leather industry. Zirconium tanning agents have good tanning performance, but their permeability is poor. Halide perovskites, composed of metal ions and organic ligands, are metal-tunable nanomaterials. In order to improve the permeability of zirconium. In this study, Cs 2 ZrCl 6 was synthesized using zirconium ions and combined with Zr(SO 4 ) 2 for collagen modification application. Based on the principle of reversible reactions, the introduction of Zr(SO 4 ) 2 effectively alleviated the rapid hydrolysis of Cs 2 ZrCl 6 , ensuring the preservation of its nanostructure and enabling continuous penetration during the tanning process. The EDS analysis confirmed the uniform distribution of zirconium in leather collagen tanned with Cs 2 ZrCl 6 /Zr(SO 4 ) 2 . Compared with Zr(SO 4 ) 2 tanned leather (73.1 °C), the shrinkage temperatures of Cs 2 ZrCl 6 /Zr(SO 4 ) 2 tanned leather collagen (83.7 °C) is better. Additionally, the BOD 5 /COD cr ratio of the tannery wastewater in this system is 0.65, indicating excellent biodegradability. The development of the Cs 2 ZrCl 6 /Zr(SO 4 ) 2 tanning system provides a new approach for creating chromium-free tanning agents.
研究领域:
材料科学
·
化学工程
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHEMISTRY
·
2016
·Vol. 84
·期 12
·948-952
·
IF 0.791
Xiyun YANG,Ling RAN,Shenghai YANG
Anodic dissolution of zirconium in Bun4NBr-containing n-butanol solutions was investigated using cyclic voltammetry, linear sweep voltammetry and potentiostatic current–time transient and scanning electron microscopy (SEM). Zirconium did not exhibit active dissolution due to passivation in the potential region of 0.2 to 1.2 V vs. SCE. The zirconium dissolution in passive state was under mass transfer control. Pitting corrosion took place as a result of passivity breakdown by Br− anions and the typical steady-state pitting potential was between 1.55–1.60 V vs. SCE in n-butanol solutions containing 0.08 M Bun4NBr. SEM images confirmed the occurrence and the intensification of pits with an increase of potential. Increasing Bun4NBr concentration accelerated the pit nucleation and growth. The reaction order leading to pit nucleation process was 1.0 with respect to bromide anions. The dissolution of zirconium in n-butanol solution produced Zr(OC4H9)4.
研究领域:
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
Communications Materials
·
2025
·Vol. 6
·期 1
·1-9
·
IF 9.6
Luo Tao,Li Shen-Ao,Chen Liu-Cheng,Zhong Guo-Hua,Lin Hai-Qing,Chen Xiao-Jia
The hydrides based on transition metal nitrides are believed to be potential candidates of low-pressure superconductors. However, the relevant theoretical and experimental studies are lack. Here, we report a theoretical and experimental study of the superconductivity in Zr-N-H system. Two high-pressure phases of P 6 3 / m m c -ZrNH 2 and \(F\bar{4}3m\) -ZrNH are found to be stable. The superconducting transition temperature of the former is theoretically predicted to be relatively low with the values of 15–17 K, while the transition temperature of the latter is higher, close to 40 K at megabar pressures. The difference in transition temperature values mainly comes from the different forms of H in hydrides. To examine this theoretical prediction, we synthesize Zr-N-H ternary hydrides experimentally at high pressures by laser heating. The resistance measurements confirm the superconductivity of P 6 3 / m m c -ZrNH 2 and \(F\bar{4}3m\) -ZrNH. The present results provide a promising avenue for exploring the superconductivity in transition-metal nitrides.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Shaolong Li,Zepeng Lv,Jilin He,Jianxun Song
ZrC x O y with composition ZrC 0.79 O 0.21 were synthesized through the carboreduction of ZrO 2 in this paper. Subsequently, these ZrC x O y blocks obtained through reaction sintering were directly subjected in a graphite crucible as an anode for electrolysis preparation of metallic zirconium in NaCl-KCl melt. The effects of applied voltage, fluoride ions, and initial zirconium ion content on anodic dissolution were studied, as well as the cathodic deposition. The results indicate that the valence state of zirconium ions dissolved into the molten salt from the anode will rise with the voltage increasing from 2.7 V to 3.1 V. In addition to voltage, both fluoride ions and initial zirconium ions have significant effects on the anodic dissolution of ZrC x O y and cathodic deposition of zirconium. The microstructure of cathodic deposition products also exhibits diversity with changes in electrolysis conditions. The experimental results supply evidence for the electrolysis of ZrC x O y obtained through reaction sintering as a consuming anode for the preparation of metallic zirconium, while also providing support for the optimization of electrolysis parameters.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 15
·21459-21465
·
IF 4.527
Xianwei Su,Xiaojia Shang,Yusi Che,Shaolong Li,Jianxun Song,Jilin He
Homogenous ZrC x O y powders have been successfully synthesized by in-situ electro-reduction of solid ZrO 2 –C composite precursors in molten CaCl 2 . The effect of applied cell voltage and molar ratio of ZrO 2 to C on preparation of ZrC x O y were investigated. The reduction pathway of the composite electrode was studied based on the analysis of intermediate products using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that ZrO 2 is firstly converted to CaZrO 3 . The resulting CaZrO 3 is then reduced to ZrC x O y . The ZrC x O y formation is dramatically influenced by electrolysis voltage and molar ratio of ZrO 2 to C: a higher cell voltage and lower molar ratio of the ZrO 2 to C are more preferable for the formation of ZrC x O y powder. Homogenous ZrC x O y powders with particle size of ~100 nm are synthesized by ZrO 2 /C starting elemental powders in CaCl 2 molten salt at 1123 K for more than 3 h, when the cell voltage is 3.0 V and the molar ratio of the ZrO 2 to carbon starting materials is 1:1.0.
研究领域:
材料科学
·
无机非金属材料
·
电化学合成
·
粉末冶金
·
固态化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）