CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Kexin Lv,Hengcheng Wan,Yi Li,Shengtai Zhang,Qiang He
The garnet structure Y 3 Fe 5 O 12 (YIG) possesses a high immobilization capacity for actinides. However, the related research on the sensitivity of garnet structures to irradiation damage is still in its infancy. Herein, we synthesize Y 3-x Nd x Fe 5 O 12 (x = 0.1, 1.8) ceramics and irradiate them with 2 MeV α-particle irradiation to fluences ranging from 1 × 10 14 to 1 × 10 17 ions/cm 2 at room temperature. We evaluated the effects of irradiation damage on the phase transition and chemical stability. An amorphous layer with a thickness of 84 nm is formed by irradiation, though the grain shape and element distribution remain uniform after irradiation. In addition, Y 3-x Nd x Fe 5 O 12 (x = 0.1, 1.8) ceramics exhibit excellent chemical stability (∼ 10 −5 g m −2 · d −1 ) in the leaching process. Restricted by the topological structure of garnet, the increase in solid solubility does not lead to a change in the radiation tolerance of the garnet structure, which means that garnet of different compositions should have similar and predictable radiation tolerance.
研究领域:
材料科学
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核科学
·
固体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wenwu Zhou,Jianyong Ye,Sheng Zhuo,Danxia Yu,Ping Fang,Rong Peng,Yue Liu,Weifan Chen
The pigments with high near-infrared (NIR) reflectance hold great promise toward both fundamental types of researches and applications for the realization of comfortable indoor-temperature by mitigating urban heat island effect. However, the facile yet simple method for the NIR reflective pigments with bright color and non-toxic feature remains a huge challenge, limiting their practical application. Herein, we proposed a mild and universal method of solution combustion for constructing the non-toxic and NIR reflective yellow-green pigments of Al-doped Y 3 Fe 5 O 12 . The Y 3 Fe 4 AlO 12 pigment presented a high NIR reflectance of 87.66%, and an outstanding acid/alkali resistance. Moreover, the pigment had an impressive color performance (L* = 78.72, a* = − 4.05, b* = 40.04). Besides, the practical near-infrared reflection performance revealed that the transient surface temperature of the Y 3 Fe 4 AlO 12 pigment was 7.6 °C lower than that of the pigment with similar color on the market. This research supplied high NIR reflecting pigments of Y 3 Fe 5−x Al x O 12 as promising coatings for roofs and exterior walls of buildings, acting as a favorable solution for urban heat island effect.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 2
·1459-1471
·
IF 3.784
Shengtai Zhang,Baoliang Xu,Jingkai Cheng,Shilin Luo,Yi Ding,Shiyin Ji,Tao Duan,Jianjun Ma,Cairong Jiang
Molten salt provides a fast mass transfer and nucleation process, so the ceramic solid solution for immobilization of high-level nuclear waste (HLW) can be synthesized at lower temperatures. The chemical stability in the process of interaction with groundwater determines the ability of the matrix phase to prevent radionuclides from entering the biosphere. Nd-doped Y 3 Fe 5 O 12 ceramics were prepared by the molten salt method at different sintering temperatures (1000℃, 1100℃, 1200℃) and different m (eutectic salt): m (oxide) ratios (2:1, 3:1, 4:1). The sintered ceramic is Y 3-x Nd x Fe 5 O 12 , where x is the solubility of Nd in YIG. The results show that the optimum mass ratio of molten salt to oxide is 3:1. The solubility of Nd in garnet is 33.3 mol% ( x = 1.1) and 56.7 mol% ( x = 1.6) at 1100℃ and 1200℃, respectively. In the neutral medium, Nd does not transfer to the liquid phase. Acid leaching promotes the strong dissolution of the garnet matrix. In this case, the leaching rate of Nd from ceramics to the liquid phase is two to three orders of magnitude higher than that in a neutral medium. The experimental results suggest that garnet matrices can reliably immobilize actinides in subsurface repositories.
研究领域:
材料科学
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核废料管理
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环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Shengtai Zhang,Lingkun Wang,Baoliang Xu,Jian Liu,Shilin Luo,Shiyin Ji,Yi Ding,Ling Zhang,Jianjun Ma,Tao Duan
The garnet structure is a promising solid material for nuclear waste because it can contain all kinds of actinides. Yttrium iron garnet Y 3 Fe 5 O 12 (YIG) is the model component of this kind of substitute. In this study, Nd-doped YIG ceramic samples were prepared by microwave sintering at different sintering temperatures (1100 °C, 1200 °C, and 1300 °C) for different sintering time (0.5 h, 2 h, 4 h, and 6 h). The effects of synthesis temperature and sintering time on the solubility and microstructure of Y 3-x Nd x Fe 5 O 12 (0 ≤ x ≤ 3.0) were evaluated. The X-ray diffraction (XRD), scanning electron microscopy (SEM) and backscattering scanning electron microscopy (EBSD) results show that single phase garnet structure can be synthesized and enhanced solubility of Nd in YIG was found at higher temperatures. The solubility of Nd in garnet is 50 mol% (x = 1.5) and 60 mol% (x = 1.8) at 1200 °C and 1300 °C, respectively. There is no significant dependence of the solubility on sintering time. The SEM analysis and Archimedes drainage test show that the relative density of Y 1.2 Nd 1.8 Fe 5 O 12 ceramics is 88.15% and 99.94% at 0.5 h and 6 h, respectively, indicating dense YIG could be obtained with a relatively long sintering time. The results show that microwave sintering can rapidly and efficiently synthesize the YIG ceramic samples.
研究领域:
材料科学
·
核废料管理
·
陶瓷
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 22
·1787
·
IF 3.2
Zhang Qiuyang,Liu Guixiang,Dai Bo,Liu Kuan,Wang Wei,Ren Yong,Xu Fang
To satisfy the combined magnetic and dielectric requirements of electromagnetic materials for modern communication systems, (1- x )Y 3 Fe 5 O 12 - x BaTiO 3 (YIG-BTO) multiphase ceramics were prepared via a conventional ceramic processing method. The phase composition, element distribution, microstructure, and magnetic and dielectric properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), and a precision impedance analyzer. The results indicate that, at the microscale, the YIG and BTO phases coexist uniformly within the YIG-BTO composite ceramics. The microstructure, relative density, and grain size of the YIG-BTO ceramics are closely related to the BTO content, which in turn synergistically affects their magnetodielectric properties. For the 90 wt% YIG-10 wt% BTO ceramic sample with a relative density ( ρ r ) exceeding 95%, an optimal overall magnetodielectric performance is achieved. At 100 kHz, the initial permeability ( μ′ ) is 39.08, the magnetic loss ( tanδ μ ) is 0.1, the dielectric constant ( ε r ) is 29.32, the dielectric loss ( tanδ ε ) is 0.071, and the saturation magnetization ( 4πMs ) is 1563.67 Gs. This study provides a systematic theoretical basis for the practical application of the promising YIG-BTO multiphase material system.
✓ 已验证
产品关联
DOI
高影响因子
Magnetochemistry
·
2021
·Vol. 7
·期 5
·56
·
IF 2.193
Yimin Yang,Xiaoying Li,Ziyu Liu,Dianjun Hu,Xin Liu,Penghui Chen,Feng Tian,Danyang Zhu,Lixuan Zhang,Jiang Li
Nanoparticles prepared by the coprecipitation method were used as raw materials to fabricate Y3Fe5O12(YIG) ceramics by air pressureless sintering. The synthesized YIG precursor was calcinated at 900–1100 °C for 4 h in air. The influences of the calcination temperature on the phase and morphology of the nanopowders were investigated in detail. The powders calcined at 1000–1100 °C retained the pure YIG phase. YIG ceramics were fabricated by sintering at 1200–1400 °C for 10 h, and its densification behavior was studied. YIG ceramics prepared by air sintering at 1250 °C from powders calcinated at 1000 °C have the highest in-line transmittance in the range of 1000-3000 nm. When the sintering temperature exceeds 1300 °C, the secondary phase appears in the YIG ceramics, which may be due to the loss of oxygen during the high-temperature sintering process, resulting in the conversion of Fe3+into Fe2+.
研究领域:
材料科学
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陶瓷工程
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纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）