CERAMICS INTERNATIONAL
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2025
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IF 5.6
Yue Ji,Tian Tian,Pengju Chen,Yuan Zhao,Hao Wu,Yan Wu,Hiroshi Watabe,Wenlong Li,Yuezhou Wei,Xiangbiao Yin
99m Tc is one of the most widely used radioisotopes in nuclear medicine for diagnostic applications, with its supply critically dependent on the beta (β)-decay of the parent nuclide 99 Mo. To address this dependency, the cold sintering process has been introduced as a novel and facile technique to fabricate high-density MoO 3 ceramic targets for efficient 99 Mo production. It was explored in detail for the effects of transient liquid solutions, sintering temperature, uniaxial pressure, holding time, and additive formulation on the densification of raw MoO 3 powder. The results show that the typical transition solution of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O and H 2 O mixture was most conducive to densifying MoO 3 material. The optimum conditions for cold sintering were under temperature of 200 °C, pressure of 500 MPa, holding time of 10 min, and transient aqueous solution of 10 wt.% (NH 4 ) 6 Mo 7 O 24 ·4H 2 O and 10 wt.% H 2 O. After further annealing cold-sintered MoO 3 at 600 °C, pure MoO 3 ceramic was obtained with the disappearance of the second phase. The pure MoO 3 ceramic target had a relative density of 95.48%, compressive strength of 118.01 MPa, and micro-Vickers hardness of 0.472 GPa. All these results suggested that cold sintering could be an energy-saving economical and efficient technique on the densification of MoO 3 for preparation its ceramic target, which are expected to inspire new insights to establish more practical technologies for 99 Mo and 99m Tc productions.
研究领域:
核医学
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材料科学
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放射性同位素生产
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产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2021
·Vol. 35
·期 6
·1098-1103
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IF 0.957
Zhai Xiaoyu,Peng Xiang,Ma Yunqian,Liu Ting,Liu Jiaxiang
The effect of particle size on the density and resistivity of ITO green bodies and targets was systematically investigated. The experimental results show that the relative density of ITO green bodies decreases with the increase of ITO particle size. When the particle size is 10.7 nm, the relative density of ITO green bodies rises to the maximum value of 56.6%. The resistivity declines exponentially with the increase of particle size, which satisfies the exponential equation of R = exp(−41.823 × d). When the particle size is 41.6 nm, the resistivity reaches the minimum value of 0.8 Ω·cm. The relative density of ITO target decreases with the increase of particle size. Fine particles can increase the driving force of densification in initial stage. Electron mobility, caused by grain boundary scattering, will increase due to the increase of particle size or the decrease of grain boundary potential. When the particle size is 10.7 nm, the target with compact grain stacking and low porosity shows a maximum relative density of 99.25%, and the resistivity reaches the minimum value of 0.34×10 −3 Ω·cm.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 2
·164
·
IF 2.9
Wanlei Dai,Zhaoyi Jiang,Yali Sun,Juhua Wang,Zeran Gao,Haoyu Xu,Xinzhan Wang,Chao Gao,Qiang Ma,Yinglong Wang,Wei Yu
In this study, a feasible strategy is proposed for directly depositing high-quality Cu(In,Ga)Se2(CIGS) films using Na-doped targets in a selenium-free atmosphere to boost the power conversion efficiency (PCE) of CIGS solar cells. Introducing a small amount of sodium dopant effectively promoted the textured growth of CIGS crystals in the prepared films, resulting in larger grain sizes and a smoother interface. The higher MoSe2content at the CIGS/Mo interface increased the carrier lifetime in the films. In addition, sodium doping increased the proportion of Se atoms on the film surface and reduced the concentration of defects caused by the direct sputtering of the films in the selenium-free atmosphere. Therefore, the separation and transportation of photo-generated carriers in the devices were effectively enhanced. Using the optimized parameters, a record-high PCE of 17.26% was achieved for the 7.5% Na-doped devices, which represents an improvement of nearly 63%.Keywords:Cu(In,Ga)Se2;sodium-doped targets;magnetron sputtering;solar cells
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
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2022
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IF 1.279
Kejun Dong,Jiaqi Zhang,Sheng Xu
The Aluminum-26 accelerator mass spectrometry (AMS) technique has been widely applied in many scientific fields. At present, Al 2 O 3 is routinely used as the target material for Al − extractions. However, the lower Al − ion beam current limits the measurement sensitivity. In this study, a series of experiments on Al − ion beam current, conductive agent, and interference background were carried out based on previous research and the low-energy AMS system of Tianjin University. The results showed that AlN as a potential target material to replace Al 2 O 3 is worth further study, while Mg element is still one of the main interference factors for low-energy 26 Al-AMS.
研究领域:
核物理学
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地球科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Fei Liang,Jiaxiang Liu
High density and low electrical resistivity ITO targets were prepared by normal pressure sintering in oxygen with Bi 2 O 3 –Nb 2 O 5 addition. The relative density, microstructure and electrical properties of the ITO targets can be adjusted by changing the sintering temperature (1350 °C~1550 °C) and the content of Bi 2 O 3 –Nb 2 O 5 . The results show that the sintering temperature of ITO targets with Bi 2 O 3 –Nb 2 O 5 decreased from 1550 °C to 1450 °C, and the maximum relative density (99.6%) and the lowest electrical resistivity (1.78×10 −4 Ω cm) were reached when the sintering temperature was 1450 °C with 5 wt% Bi 2 O 3 –Nb 2 O 5 . The carrier concentration increased as the increase of the contents of Bi 2 O 3 –Nb 2 O 5 and sintering temperature. The mobility first increased, and then decreased above 1450 °C as the sintering temperature increased.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Ting Liu,Wenxiao Zhang,Xiaoyu Zhai,Yunqian Ma,Yujie Chen,Jiaxiang Liu
A novel ternary-size particles interstitial filling gradation stacking model has been proposed and discussed systematically for preparing dense indium tin oxide (ITO) targets with high density and low resistivity. In this stacking model, three particle sizes satisfy a ratio of 1 : 2 -1 : 6 2 - 1 . Significantly, the target sintered at 1550 ℃ for 10 h shows maximum relative density of 99.67% and minimum resistivity of 0.79 × 10 -4 Ω·cm. Moreover, two new binary-size particles interstitial filling stacking models are proposed and discussed. In binary-size particles models, designed particle sizes satisfy the formulas of d = ( 6 2 - 1 ) × D and d = ( 2 - 1 ) × D , respectively. These excellent properties are caused by the compact structure. The small particles are filled in the internal gaps between larger particles. 64&118&285 nm ternary-size particles model obviously increases density and decreases resistivity of target. This novel strategy contributes to preparing high-performance target, promoting the development of next generation ITO functional materials.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2022
·
IF 4.804
Lei Huang,Yafei Pan,Jiuxing Zhang,Yong Du,Yuhui Zhang
W-30Si refractory targets were widely used as gate materials in the field of semiconductor integrated circuits. This work aimed to study the microstructure, densification mechanism, and mechanical properties of W-30Si targets prepared by spark plasma sintering (SPS). The results manifested that the punch displacement and relative density rose as temperatures increased, and the sintering route processed at 1200 °C included four parts. A fully dense target can be obtained at 1200 °C, while part of Si would volatilize at 1220 °C. No significant variation was observed in grain sizes from 1000 to 1200 °C, thus it was believed that the consolidation predominated over this temperature range. The effective stress exponent ( n ) was generally regarded as a parameter closely related to the densification mechanism. At the initial stage of 1000 to 1200 °C and the late stage of 1000 °C ( n < 1), the particle rearrangement had a major influence on the densification. At the late stage of 1050 to 1200 °C (1 < n < 2), the grain boundary diffusion was a significant factor for consolidation, and the activation energy ( n = 1.5) was estimated to be 931.40 kJ/mol. Besides, the microhardness rose with increasing temperatures. The present study laid the groundwork for future research on the fabrication of W-30Si targets by SPS.
研究领域:
材料科学
·
机械工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xiaoyu Zhai,Yujie Chen,Yunqian Ma,Shichao Sun,Jiaxiang Liu
A new strategy of 44&285 nm binary-size particles system has been proposed and discussed systematically for fabricating fine grain, high density and low resistivity indium tin oxide (ITO) target. Polyvinyl pyrrolidone (PVP) and Polyvinyl alcohol (PVA) were used as dispersant and adhesive. The effects from PVP, PVA, sintering temperature and holding time have been systematically investigated. The target, prepared by 44 nm powders with a sintering temperature of 1550 °C and a holding time of 10 h, shows a maximum relative density of 99.31% and a minimum resistivity of 4.17 × 10 −4 Ω cm. Moreover, based on 285 nm powders, the target sintered at 1550 °C for 10 h shows a maximum relative density of 99.27% and a minimum resistivity of 4.11 × 10 −4 Ω cm. Significantly, 44&285 nm binary-size particles system obviously increases the density and decreases the resistivity of target. And the maximum relative density, minimum resistivity and grain size are 99.57%, 0.92 × 10 −4 Ω cm and 1.34 μm, respectively. In this model, the two designed particle sizes satisfy a formula of d = ( 2 3 3 − 1 ) × D . This new strategy contributes to preparing high-quality target, promoting the development of next generation ITO functional materials .
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Chongyang Chen,Benshuang Sun,Bingxue Han,Lijia Chen,Bin Wu,Chengduo Wang,Zhijun Wang
Indium zinc oxide (IZO) ceramic targets have been extensively studied due to the advantage of high film mobility and controllable resistivity. As the base materials used for IZO ceramic targets, it is crucial to synthesize IZO composite nanoparticles by an effective technique. Herein, praseodymium (Pr)-doped IZO composite nanoparticles are fabricated by co-precipitation method. The influencing factors for the synthesis of the composite nanoparticles are analyzed, and the nanoparticles show the best properties of most uniform particle shape, size, and elemental distribution under the preparation conditions of ammonia or sodium hydroxide as an alkaline precipitant, pH of 7, and sintering temperature of 800°C. The phase composition, micro-morphology, compositional homogeneity, and chemical bonding and functional group changes of precursors and sintered particles are analyzed. Meanwhile, combined with the thermogravimetric - differential scanning calorimetry (TG-DSC) analysis of the decomposition process of the hydroxide precursor during heating, the crystallization activation energy for the transformation of the precursor from the amorphous to the crystalline state was calculated by the Kissinger and Ozawa method. Based on the concept of crystallization fraction, the crystallization mechanism of the mixed particles of precursors is explored. In addition, ceramic targets prepared from the IZO nanoparticles by this method exhibit excellent uniform elemental distribution and fine grain (<4 µm), high density (>99%), and low resistivity (<4 mΩ·cm). This work provides an efficient strategy for the preparation of IZO composite nanoparticles for applications in advanced photoelectric ceramic targets.
研究领域:
材料科学
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纳米技术
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陶瓷材料
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光电子学
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物理化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）