JOURNAL OF NUCLEAR MATERIALS
·
2018
·
IF 2.447
Shuyang Li,Xiaoyong Yang,Jian Liu,Xiaofeng Zhao,Shahid Hussain,Yi Ding,Yong Yi,Tao Duan
Using Ce atom as the surrogate for tetravalence actinides, the structure stability, chemical bonding and solubility of Zr 1- x Ce x SiO 4 have been investigated by combing first principles calculations and static leach test (MCC-1) experimentally to understand the effect of actinides on stability of ZrSiO 4 . The structural analysis indicates that the high symmetry of [CeO 8 ] polyhedron could well maintain the structural stability of Zr 1- x Ce x SiO 4 . However, due to the longer and weaker Ce O bond than Zr O bond, LR Ce is slightly higher than LR Zr . Besides, the LR Zr and LR Ce are highest in acid leaching solution , followed in alkaline leaching solution and deionized water system. Worth noted, the negative solution energy of −22.254 eV indicates the pre-existing Zr vacancy is energetically favorite to accommodate actinides surrogate Ce impurities or quadrivalent actinides with slight structural deformation, showing the strong structural and chemical stabilities of ZrSiO 4 .
研究领域:
材料科学
·
核化学与放射化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Yang Wu,Ying Dai,Yijun Liu,Libiao Xiao,Wen Chen,Xinmei Pei,Fanfeng Xie
In this study, a Pr–ZrSiO 4 pigment was synthesised using a solid-state method with Pr 6 O 11 , ZrO 2 and SiO 2 as raw materials and H 3 BO 4 as the mineraliser. Results demonstrated that as the temperature was increased from 1100 °C to 1400 °C, the H 3 BO 4 -containing Pr 0.08 Zr 0.92 SiO 4 sample underwent a distinct colour transition from yellow (1100 °C–1200 °C) to green (1250 °C–1400 °C). By contrast, the sample without H 3 BO 4 maintained a yellow hue between 1100 °C and 1400 °C. Transmission electron microscopy analysis revealed Pr 2 Zr 2 O 7 secondary phase dispersed in ZrSiO 4 of the green powders. The added H 3 BO 4 reacted with SiO 2 to form a borosilicate glass phase that exhibited a strong adsorption capacity for lattice oxygen, resulting in the generation of oxygen vacancies in ZrSiO 4 . To maintain valence balance, Pr 4+ (yellow) converted to Pr 3+ (green) and the secondary phase Pr 2 Zr 2 O 7 was formed in ZrSiO 4 . The valence state transition of Pr ions (Pr 4+ /Pr 3+ ) was the primary reason for the colour transition. The green pigment exhibited excellent high-temperature stability, showing potential application in the ceramic industry.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Shuyang Li,Jian Liu,Xiaoyong Yang,Yi Ding,Lin Zhu,Bo Liu,Ling Zhang,Shilin Luo,Jiehong Lei,Wenkun Zhu,Tao Duan
Zircon ceramics (ZrSiO 4 ) are promising candidates for actinide immobilization. Here, a series of Zr 1- x Nd x SiO 4- x /2 ( x = 0, 0.02, 0.20, and 1.0) ceramics are prepared to study the effects of phase evolution and acidity on the chemical durability of ZrSiO 4 -based nuclear waste forms. The results show that the chemical stability of the single-phase ZrSiO 4 sample is better than that of the biphasic Zr 0.8 Nd 0.2 SiO 3.9 sample due to the existence of a secondary highly soluble phase (Nd 2 Si 2 O 7 ), which increases the contact area with leachate. The normalized release rates of both zirconium (Zr) and neodymium (Nd) in the Zr 1- x Nd x SiO 4- x /2 ceramic waste forms increase with increasing Nd loading and acid concentration. LR Zr in ZrSiO 4 ceramics and LR Nd in Zr 0.98 Nd 0.02 SiO 3.99 ceramics are the lowest, while LR Zr and LR Nd reach the highest values in the Zr 0.8 Nd 0.2 SiO 3.9 and Nd 2 Si 2 O 7 ceramics, respectively. The normalized release rates of Zr are lower than those of Nd due to the difference in the energies of their bonds with oxygen atoms. Moreover, the changes in the surfaces of the leached ceramics are consistent with their leaching results.
研究领域:
材料科学
·
核化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhengdi Jiang,Hongyue Lei,Lang Wu,Yi Ding
During the traditional preparation of zircon , higher sintering temperatures and longer holding times are inevitable. A novel hydrothermal-assisted sol-gel process and microwave sintering (HM, microwave sintering precursors derived from hydrothermal-assisted sol-gel process) were provided to prepare zircon ceramics hereof. The influences of sintering temperature and holding time on the phase composition, microstructure, and compactness of ceramics were investigated. Data display that the properties of the obtained ceramics were highly dependent on the temperature and time, and the ZrSiO 4 formation efficiency can be improved by increasing these two factors. The sample prepared by the HM process has the formation efficiency of ZrSiO 4 up to 91.74 wt% ( HM-1350-300 ), which far exceeds that of conventional microwave sintering ( M-1350-300 , 45.02 wt%). The results demonstrate that the HM process can be employed to obtain ZrSiO 4 ceramics rapidly at low temperatures.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 4
·e70617
·
IF 4.2
Ze Qiu,Wencai Cheng,Zhenwei Niu,Congcong Ding,Xiaoyan Shu,Dong Wu,Xirui Lu
Radioactive spent silica gel is a type of secondary waste generated during the decontamination and purification processes of spent fuel reprocessing. This work reports borosilicate glass containing zircon mineral phases to achieve the immobilization of such waste. The physical phase evolution, microstructure, and immobilization mechanism were systematically investigated. The XRD and refinement results confirmed the lattice substitution of uranium in zircon crystals. The XPS and UV-vis-DRS results demonstrated that the uranium mainly showed quadrivalent and pentavalent states in the ZrSiO 4 crystal. The FT-IR results demonstrated that the microcrystal glass became more structurally intact and polymerized as the uranium content in the crystal increased. EPR analysis and theoretical calculations revealed that the entry of uranium into the ZrSiO 4 structure adjusted the amount of oxygen vacancy defects in the material. The electron density difference analysis showed that the electrons produced by the vacancy defects were concentrated on the surrounding oxygen atoms. Ultimately, these behaviors enhanced the chemical stability of the material. This work provides a good strategy for the disposal of this waste and a new perspective on the entry of uranium atoms into the zircon structure in the field of radioactive waste disposal.
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DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Ting Chen,Xiaojun Zhang,Weihui Jiang,Zhixiang Xie,Yanqiao Xu,Huidong Tang,Wan Jiang
A core-shell structure zirconium silicate encapsulated carbon (C@ZrSiO 4 ) pigment was synthesized by a molten-salt assisted method. The experimental results indicated that the Na 2 WO 4 molten-salt associated with the synthesis of ZrSiO 4 at low temperature and controlled the morphology of the encapsulation pigment simultaneously. The encapsulated pigment prepared with the assistance of Na 2 WO 4 molten-salt showed regular microcubes about 3.0 μm, while the pigment in the absence of molten-salt have serious aggregation with a particle size of 12.78 μm. Moreover, the maximum addition amount of carbon black was increased significantly from 15 wt% to 40 wt% after adding molten-salt, while the chromatic value L * of C@ZrSiO 4 pigment decreased from 68.21 to 33.08 accordingly. The pigment exhibited excellent thermal stability at high temperature, making it a promising candidate for ceramic decoration.
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
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 9
·5476-5486
·
IF 3.9
Shan Peng,Ranran Yang,Binglong Lei,Renhua Chen,Yun Gao,Xiaohong Xia,Kevin P. Homewood
It is of particular significance to unveil the authentic coloration mechanism of the multivalent praseodymium colored ZrSiO 4 yellow pigments for advanced decoration applications. We herein adopted a facile strategy to modulate the fluorine-assisted zircon crystallization and thereby obtained ultrafine Pr-ZrSiO 4 yellow pigments, which have a remarkably narrow size distribution and average diameters within 250–400 nm. By virtue of some cogent combinative spectra of reflection, absorption, excitation, and emission from three types of elaborately-designed H 2 -, air-, and O 2 -based pigments, the coloration mechanism for the Pr-colored zircon was systematically unveiled: both Pr 4+ and Pr 3+ coexist invariably in the pigments, while the former contributes primarily to the ligand-to-metal charge transfer from O 2p to Pr(IV) 4f for the blue–violet absorption to generate the yellow hue, and the latter is inclined to discolor the pigments. Therefore, an oxidizing atmosphere is preferable to produce brilliant Pr-ZrSiO 4 pigments with enhanced chromatic properties. The stark spectroscopic distinctions between the wide-band absorption from the nonluminescent tetravalency and the narrow-band absorption from the luminescent trivalency can expand our understanding to the rare-earth-based inorganic pigments.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
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
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xiaoli Chen,Binxu Cai,Yi Cai,Yizhe Pan,Feng Xiao,Ye Xu,Jie Yin,Zuowei Ying,Zheng Li
Colored zirconia suspensions are difficult to process by stereolithography because coloring species absorb ultraviolet light and the ceramic particles introduce additional scattering. Here, pink, green, and blue 3Y-ZrO 2 suspensions were modified by replacing 0-20 vol% of the ceramic phase with SiO 2 while maintaining a constant total solids loading of 45 vol%. Increasing the SiO 2 content reduced the apparent optical attenuation near 355 nm, increased the cure depth and depth-sensitivity parameter, and lowered the critical exposure energy. Suspensions containing 15-20 vol% SiO 2 showed the most favorable photocuring response within the investigated range and enabled stable printing. The same compositional modification also influenced subsequent thermal evolution: SiO 2 reacted with ZrO 2 to form ZrSiO 4 , and the selected composites reached relative densities above 97%. The sintered specimens retained characteristic pink, green, and blue coloration, with only limited color differences between the 15 and 20 vol% compositions. Flexural strengths of 200-370 MPa and Vickers hardness values of 10-14 GPa were obtained. These results show that SiO 2 substitution can improve the printability of strongly attenuating colored zirconia suspensions while supporting densification during sintering, although ZrSiO 4 formation introduces a trade-off in mechanical performance.
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2021
·Vol. 32
·期 8
·2940-2949
·
IF 4.833
Shanfang Lan,Qing Hu,Qianqian Zhao,Weihui Jiang,Jianmin Liu,Guo Feng,Feng Jiang,Huidong Tang,Junhua Chen
With the increasing popularity of the black decorative ceramics, the development of black pigment with good properties has become significant for the ceramic industry. A Mn-doped zirconium silicate encapsulated carbon (C@ZrSiO 4 ) black pigment was successfully prepared via non-hydrolytic sol-gel (NHSG) method at 800 °C, while MnCl 2 and carbon-containing precursors (tetraethoxysilane, TEOS) were used as Mn and in-situ carbon sources, respectively. The results demonstrated that the L* value of black pigment first decreased and increased with the increase of MnCl 2 content. The as-prepared pigment with the MnCl 2 content of 10 mol% showed a deep dark hue ( L* = 27.64, a* = 0.67, b* = 0.68), while the pigment without Mn doping exhibited poor chromatic properties ( L * = 51.18). Moreover, XPS and EPR results indicated that the Mn(II) and Mn(IV) replaced the Zr(IV) in ZrSiO 4 , resulting in the formation of oxygen vacancies. In-situ carbon provided by TEOS incorporated into these oxygen vacancies, which can protect carbon from being oxidized. In addition, the prepared pigment exhibited higher chemical stability in acid/alkali solutions, favorable tinting strength and thermal stability in base transparent glaze, which displayed wide application prospect in the field of ceramic decoration.
研究领域:
材料科学
·
陶瓷
·
颜料化学
·
溶胶-凝胶工艺
✓ 已验证
DOI
高影响因子
BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO
·
2023
·
IF 3.4
Feng Jiang,Junling Yu,Guo Feng,Tao Wang,Xiaojun Zhang,Quan Zhang,Rongchi Zhang,Qian Wu,Qing Hu,Yun Yu,Jianmin Liu
Novel (Cr,V)-ZrSiO 4 jewel green pigments with near-infrared reflection performance were prepared at a low temperature of 900 °C. Effects of Cr/Si mole ratio on phase composition, microstructure, Vis–NIR reflection performance, optical properties and thermal stability were studied. The results show that with the increase of Cr/Si mole ratio from 0 to 0.4, the color of the pigment changes from blue to jewel green and then to dark green. When the Cr/Si mole ratio is 0.2, the (Cr,V)-ZrSiO 4 jewel green pigment shows the best comprehensive properties, which has rendering performance ( L * = 56.69, a * = −18.52, b * = −9.28), thermal stability, and near-infrared reflection performance. The properties especially excellent near-infrared reflection performance make it promising functional pigment in heat insulation. Resumen Se prepararon nuevos pigmentos verde joya (Cr,V)-ZrSiO4 con rendimiento por reflejo en el infrarrojo cercano a una temperatura baja de 900 ̊C. Se estudiaron los efectos de la relación molar Cr/Si sobre la composición de fase, la microestructura, el rendimiento de reflexión Vis-NIR, las propiedades ópticas y la estabilidad térmica. Los resultados muestran que con el aumento de la relación molar Cr/Si de 0 a 0,4, el color del pigmento cambia de azul a verde joya y luego a verde oscuro. Cuando la relación molar Cr/Si es 0.2, el pigmento verde joya (Cr,V)-ZrSiO4 muestra las mejores propiedades integrales, que tiene rendimiento de renderizado (L* = 56.69, a* = -18.52, b* = -9.28), estabilidad térmica y rendimiento de reflexión en el infrarrojo cercano. Las propiedades especialmente excelente rendimiento de reflexión en el infrarrojo cercano lo convierten en un pigmento funcional prometedor en el aislamiento térmico.
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
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junling Yu,Feng Jiang,Jianmin Liu,Tao Wang,Xiaojun Zhang,Quan Zhang,Rongchi Zhang,Qian Wu,Qing Hu,Yun Yu,Guo Feng
Novel (Cr,V)–ZrSiO 4 jewel green pigments with good near-infrared reflection performance were prepared by in-situ mineralization at a low temperature of 900 °C. The synthesized pigments were characterized through XRD , FE-SEM, TEM, UV–Vis–NIR, XPS, and CIE L*a*b* colorimetry. The results show that Cr–V co-doping into the zircon lattice can effectively promotes the synthesis of zircon, and significantly produce a coloring effect from blue to jewel green and then to dark green with the increase of Cr/Si mole ratio from 0.025 to 0.4. The optimized Cr/Si is 0.2, showing excellent color rendering performance ( L * = 56.69, a * = -18.52, b * = -9.28). The electron transitions of the (Cr,V)–ZrSiO 4 pigments exhibits broadband emission and shifts to longer wavelength (530 nm) relative to V–ZrSiO 4 with Cr/Si mole ratio of 0, corresponding to the jewel green region. And the pigments possess good near-infrared reflectance in the range of 700–2500 nm. The properties especially excellent near-infrared reflection performance make it promising functional pigment for energy-saving and health.
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
危险品化学品经营许可证（带存储）