JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Xiaowen Hu,Jinwu Chen,Jie Li,Huaicheng Xiang,Ying Tang,Liang Fang
Two zircon-structured ceramics AEuV 2 O 8 (A = Bi, La) were prepared with optimal sintering temperatures of 900 °C and 1375 °C, respectively. They exhibited sharp contrast performances with medium ε r ∼ 28.7 ± 0.1, Q × f ∼ 14,000 ± 300 GHz, and large positive τ f ∼ 75.7 ± 2.0 ppm/°C for BiEuV 2 O 8 , whereas low ε r ∼ 10.4 ± 0.1 Q × f ∼ 25,100 ± 300 GHz, and negative τ f ∼ − 40.7 ± 2.0 ppm/°C for LaEuV 2 O 8 . The rattling effect at the A-site was more dominant in determining microwave dielectric properties than that of compressed V 5+ at the B-site. It resulted in the higher ε r , lower Q × f and τ ε , and larger τ f of BiEuV 2 O 8 than those of LaEuV 2 O 8 . Besides, their Q × f was related with the relative density, bond valence and FWHM of the B 1 g Raman mode.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 11
·7009-7018
·
IF 3.9
Yong Ge,Baoliang Xu,Yiliao Liao,Xueyu Zhang,Xu Yan,Caohui Zheng,Tao Duan
Multiphase ceramics have a high application potential in the field of nuclear waste immobilization because of the efficient synergy between the individual phases. In this work, zirconia/garnet multiphase ceramics with high efficient and effective immobilization capacity of trivalent actinides were successfully prepared using conventional solid-phase sintering. ZrO 2 doping increases the lattice site available for nuclide substitution and advance the immobilization capacity of the ceramic substrate for nuclide. At the same time, the phase change of zirconia is used to tougher and improve the physical properties of the ceramic waste form. The feasibility of using multiphase ceramics for the efficient immobilization of trivalent actinides was assessed by studying the phase evolution, microstructure, Vickers hardness, and chemical stability of the multi-phase ceramics. Zr 1- x Nd x O 2- x /2 /Ca 3- y Nd y Zr 3- y Fe y -1 Fe 3 O 12 multiphase ceramics exhibited superior physical or chemical properties compared to most of the multiphase ceramics as well as the previously prepared single-phase calcium garnet ceramic waste forms. The Vickers hardness of all the multiphase ceramic samples ranged between 685 and 730 HV0.5. Under the condition of using simulate Bei Shan groundwater as leaching agent, the normalized leaching rates of Nd is approximately 10 − 6 g · m −2 · day −1 , showing good chemical stability and achieving efficient and effective immobilization of trivalent actinides. The excellent chemical, as well as physical properties of Zr 1- x Nd x O 2- x /2 /Ca 3- y Nd y Zr 3- y Fe y -1 Fe 3 O 12 multiphase ceramics are expected to make them one of the substrates for more efficient and effective immobilizing of trivalent actinides.
研究领域:
材料科学
·
核废料管理
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 10
·6346-6355
·
IF 3.9
Lina Wu,Huiping Wang,Xiangqian Kong,Haibo Wei,Sheng Chen,Lisheng Chi
Effective removal of strontium isotopes in radioactive waste streams has important implications for the environment and the sustainable development of nuclear energy. In this work, a zirconium phosphate/18-crown-ether-6 (ZrP/18C6) composite was prepared using the intercalation method by loading crown ether into zirconium phosphate. The composite was structurally and morphologically characterized by XRD, FT-IR, XPS, and SEM. The adsorption experiments of Sr2+ onto the ZrP/18C6 composite were conducted as a function of temperature, pH, Sr2+ concentration and competing ions. The results indicate ZrP/18C6 can adsorb 98.6% of Sr2+ within 30 minutes at an Sr2+ concentration of 100 mg L−1 and maintain a high removal rate with a distribution coefficient of 7 × 105 mL g−1 when Sr2+ is at a low level of 4.28 mg L−1. The ZrP/18C6 composite reached a maximum adsorption capacity of 195.74 mg g−1 at an Sr2+ concentration of 380 mg L−1, which is significantly higher than the 43.03 mg g−1 of α-ZrP. The adsorption performance of Sr2+ onto ZrP/18C6 is not significantly affected by temperature, pH and competing ions. Furthermore, the adsorption kinetics and thermodynamics were analyzed based on the adsorption data obtained in the present work. It is shown that the adsorption of Sr2+ onto ZrP/18C6 follows the pseudo-second-order model and the Langmuir monolayer model, respectively. Additionally, the adsorption mechanism of Sr2+ by ZrP/18C6 is discussed.
研究领域:
环境科学
·
核化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yongqing Wang,Fanbing Lai,Qikun Wang,Qinghua Long,Chao Wang,Wenjie Zhang,Qibing Chang
In this paper, high color performance Pr cation doped zircon (Pr-ZrSiO 4 ) yellow pigment has been prepared by inorganic sol-gel method. Meanwhile, the detailed process parameters for preparation of Pr-ZrSiO 4 pigment were systematically investigated. The research results indicate that the optimal process parameters are Pr-doping amount of 6 mol.%, calcination temperature of 900 °C, holding time of 2 h and Si/Zr ratio of 1.05. The synthesized Pr-ZrSiO 4 pigment shows an intense yellow hue, which chromatic parameters are L* = 81.84, a* = 4.36, b* = 70.55 and C* = 70.68. Moreover, the pigment shows outstanding tinting performance for ceramic glaze , suggesting its attractive application in ceramic decoration. XPS analysis demonstrated that the Pr cations in the Pr-ZrSiO 4 pigment consists of two valence states, namely trivalent and tetravalent. Finally, heterogeneously distributed behavior of Pr cations in the pigment was discovered.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2017
·
IF 2.048
Kuibao Zhang,Dan Yin,Le Peng,Jingjun Wu,Jiali Xue
In this study, zirconolite/Mo composites were rapidly synthesized by a self-propagation reaction that uses MoO 3 as the oxidant accompanied with pressing. Zirconolite is one of the several materials that are being researched as host for lanthanides and actinides in nuclear waste . Nd was used in this study as a surrogate for actinides and was substituted into zirconolite at a stoichiometric ratio to charge balance the Ca and Zr sites (nominal formulation of Ca 1-x Zr 1-x Nd 2x Ti 2 O 7 ). Perovskite , zirconia, and rutile were generated as the minor phases with the addition of Nd 2 O 3 . The XRD results demonstrated that the Nd 2 O 3 loading is approximately 30 wt%. Nd was mainly incorporated into the lattice structure of zirconolite and perovskite. A 42-day leaching test of the Nd-bearing zirconolite/Mo composite showed that the computed normalized leaching rates for Ca and Nd at fairly low values of 9.02 × 10 −2 and 2.10 × 10 −4 g m −2 d −1 , respectively.
研究领域:
材料科学
·
核废物管理
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2018
·
IF 2.524
Weimin Li,Faqin Dong,Liang Bian,Hao Zou,Mianxin Song
In this study, Ce-doped zirconolite was synthesized through high-temperature solid-state reaction at 1250 °C in air for 96 h. The crystal phase, microstructure and valence transition were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Phase relations of CaZr 1– x Ce x Ti 2 O 7 systems were determined by XRD analyses and Rietveld refinements . Four different phases are identified, namely zirconolite, perovskite , pyrochlore, and cerianite. The phase transformation (2M-zirconolite → 4M-zirconolite → Ce-pyrochlore) is caused by cations rearrangement as cerium content increases. The solubility limit of cerium ions in CaZr 1– x Ce x Ti 2 O 7 system is estimated to be approximately 0.80. Under sintering air atmosphere, partial reduction of Ce 4+ in Ce 3+ is detected in Ce 3d XPS spectra, and the ratio of Ce 3+ and Ce 4+ significantly decreases as cerium content increases.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 16
·8749-8768
·
IF 6.123
Zhang Zhiyong,Liu Tang,Wu Deyi
The removal and recovery of phosphate from water using adsorption technology require that the adsorbent material is easily separable from treated water. Continuous efforts are still awaited to develop additional efficient phosphate adsorbents that are economical to fabricate. In this study, hydrous zirconia-impregnated chitosan beads (HZCB) containing different Zr/chitosan ratios were synthesized using a facile scheme. We found that HZCB with a Zr/amine molar ratio of ~ 1 (HZCB-1) possessed excellent stability and phosphate removal performance. This optimized material was characterized with XRD, SEM, FTIR, XPS, specific surface area and point of zero charge measurements. The maximum adsorption capacity was 42.02 mg/g (at pH ~ 6.7). The adsorption kinetics were best described by a pseudosecond-order model, and the rate constant of HZCB-1 was much lower than that of its powder but was similar to the commercial bead product Ferrolox. The removal of phosphate depended substantially upon pH and was enhanced by lowering the pH. Good selectivity of HZCB-1 for phosphate was observed, although the coexistence of sulfate produced a significant negative effect. Direct coordination of phosphate to Zr atoms by replacing hydroxyls was the dominant adsorption mechanism (~ 85%), while chitosan also contributed to phosphate removal (~ 15%). Adsorbed phosphate was successfully eluted by an NaOH solution, and the material obtained after desorption and regeneration was able to be repeatedly used. The results of column studies indicated that this material could be implemented in long-term application.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2025
·
IF 3.2
Shiyin Ji,Yanhao Song,Xiuhua Ji,Yanxia Wei,Changzhong Liao,Yuhong Li,Tao duan
Zirconolite ceramics are emerging as the promising immobilization matrix for high-level radioactive waste (HLW) in deep geological repositories. The radiation stability is a critical factor in assessing their long-term safety. In this work, three zirconolite polytypes of zirconolite-2M, zirconolite-3O and zirconolite-4M were irradiated by 1.5 MeV Xe 10+ (heavy) and 400 keV Ne 4+ (light) ions at fluences of 1 × 10 14 to 2 × 10 15 ions/cm 2 and 1 × 10 15 to 1 × 10 16 ions/cm 2 , respectively. The irradiation damage was systematically studied using GIXRD, Raman and XPS. Results showed that zirconolite-4M had marginally higher radiation resistance than zirconolite-2M, which slightly outperformed zirconolite-3O under heavy ion irradiation. For light ion irradiation, zirconolite-3O demonstrated comparable or slightly better stability than zirconolite-2M. However, Direct comparisons of radiation tolerance were complicated by variations in displacement per atom (dpa) at equivalent fluences. In addition, the phase evolution of zirconolite to cubic defect-fluorite derivative structures (pyrochlore or defect-fluorite) was observed during the amorphization process for the three zirconolite polytypes, irrespective of the ion type (heavy or light). Zirconolite-2M and -3O reached near-complete amorphization at approximately 4 dpa, while zirconolite-4M predominantly retained its crystalline structure even at higher radiation doses (2.5 dpa for light ions and 3.78 dpa for heavy ions). These findings provide critical insights into the design of HLW matrices and the evaluation of their radiation stability, contributing to the development of safer and more durable waste forms for long-term geological storage.
研究领域:
材料科学
·
核能工程
·
辐射物理
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 1
·1-13
·
IF 21.8
Gong Hao,Wang Zhongyang,Song Xiaokun,Li Hongchao,Sun Kai,Zhou Xiao,Fan Tongxiang
Effective radiative cooling is crucial for reducing undesirable energy consumption caused by thermoregulation technology. However, conventional passive coolers still suffer from challenges such as vulnerability to harsh service conditions and suboptimal radiative cooling performance without guidance from optical design. Metacoating based on photonic structure design and all-inorganic components can overcome these drawbacks. In this paper, we fabricate a metacoating for radiative cooling, incorporating zirconia submicrospheres (ZS) within a potassium silicate binder. ZS with optimal diameters of about 500 nm were synthesized to efficiently scatter sunlight. The metacoating has a solar absorption ( α s ) of only 0.04 in the 0.25–2.5 µm range, and an infrared emittance ( ε ) of 0.91 in the 2.5–16.7 µm range. The low solar absorption is attributed to the high backscattering efficiency of ZS and their high-volume fraction, as confirmed by Mie scattering theory and Monte Carlo ray-tracing simulations, while the high emittance is driven by vibrational absorption from chemical bonds in ZS and potassium silicate. After proton and electron irradiation, the metacoating retains α s below 0.083 and ε above 0.910, indicating excellent irradiation resistance. Our findings highlight that metacoating utilizing ZS with a large bandgap and suitable diameters holds significant potential for advancing space radiative cooling technologies.
研究领域:
材料科学
·
光学工程
·
空间技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2015
·
IF 1.32
Kuibao Zhang,Guanjun Wen,Zhiyong Jia,Yuancheng Teng,Haibin Zhang
Synroc is recognized as the second generation waste form for the disposal of high-level radioactive waste (HLW). In this research, one of the mostly studied Synroc minerals, zirconolite (CaZrTi 2 O 7 ), was prepared by self-propagating high-temperature synthesis (SHS). CuO and MoO 3 were employed as the oxidants with Ti as the reductant. Different TiO 2 /Ti ratios were selected to investigate reactivity and adiabatic temperature ( T ad ) of the designed SHS reactions. Zirconolite was successfully synthesized as the main phase at varied TiO 2 /Ti ratios using CuO and MoO 3 as the oxidants. The as-synthesized samples were readily solidified with desirable density and Vickers hardness.
研究领域:
材料科学
·
核废料处理
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yi-Bing Zhang,Jin Wang,Jun-Xia Wang,Yi Huang,Ping Luo,Xiao-Feng Liang,Hong-Bin Tan
In order to ascertain the structural relationship of zirconolite and pyrochlore for their potential application in HLW immobilization, the Gd-doped zirconolite-pyrochlore composite ceramics (Ca 1- x Zr 1- x Gd 2 x Ti 2 O 7 ) were systematically synthesized with x = 0.0–1.0 by traditional solid-phase reaction method. The phase evolution and microstructure of the as-prepared samples have been elucidated by XRD and Rietveld refinement , Raman spectroscopy , BSE-EDS and HRTEM analysis. The results showed that zirconolite-2M, zirconolite-4M, perovskite and pyrochlore, four phases were identified in Ca 1- x Zr 1- x Gd 2 x Ti 2 O 7 system and could be coexisted at x = 0.4 composition. With the increase of Gd 3+ substitution, the phase evolution was followed by zirconolite-2M→zirconolite-4M→pyrochlore. It is illustrated that the phase transformation from zirconolite-2M to zirconolite-4M was promoted by the preferential substitution of Gd 3+ for Ca 2+ . And the solubility of Gd 3+ in zirconolite-2M, zirconolite-4M and pyrochlore increased in sequence. The chemical stability test was also measured by the PCT leaching method. The normalized elemental release rates of Ca, Zr, Ti and Gd in Ca 1- x Zr 1- x Gd 2 x Ti 2 O 7 system were fairly low and in the range of 10 −6 −10 −8 g m −2 d −1 , which indicated a potential ceramics composite ensemble of CaZrTi 2 O 7 -Gd 2 Ti 2 O 7 system for nuclear HLW immobilization.
研究领域:
材料科学
·
核能工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiuhua Ji,Yanhao Song,Jiarun Wang,Yi Ding,Shiyin Ji,Tao Duan
Zirconolite and pyrochlore have been considered as the potential immobilization matrix materials of minor actinides due to their high solubility, radiation tolerance and chemical durability. In this work, a series of Ca 1-x Ho 2x Zr 1-x Ti 2 O 7 (0.1 ≤ x ≤ 1.0) ceramics were prepared by solid state synthesis and sintering at 1400 °C for 48 h twice. Powder X-ray Diffraction (XRD), Backscattered Scanning Electron Microscopy with Energy-Dispersive X-ray spectroscopy (BSEM-EDX), Transmission Electron Microscopy (TEM) were employed to investigate the phase evolution, solubility, and substitution mechanism of Ho. The results displayed that zirconolite-2M would be transformed to zirconolite-4M and then to pyrochlore with increasing Ho concentration. The initial phase transformation of zirconolite-2M to zirconolite-4M, subsequently zirconolite-4M to pyrochlore were observed in x = 0.2 and 0.4 samples, respectively. Zirconolite-4M could be synthesised at x = 0.38 sample with trace perovskite. Moreover, the semi-quantitively solubility limits of Ho in zirconolite-2M and zirconolite-4M were determined to be 27 and 41.5 at.%, respectively. Single-phase pyrochlore were fabricated after 70 at.%. In addition, the novel substitution mechanism was revealed by Rietveld refinement with Ho preferentially replacing the Ca of zirconolite-2M so that some replaced Ca occupied vacant Zr site. For pyrochlore, Ho, Ca and Zr occupied A site (16d) and Ti entered in B site (16c). The findings would provide more insights into zirconolite–pyrochlore ceramic system.
研究领域:
材料科学
·
核化学与放射化学
✓ 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）