JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Shiyi Zhang,Mengdi Cheng,Yangxi Yan,Zhimin Li,Pangpang Wang,Ri-ichi Murakami,Dongyan Zhang
High-performance piezoelectric materials , whose displacement is sensitive to an external field and vice versa, are constantly required in electromechanical applications. Here, we introduce Nd 3+ ions into 0.49Pb(Nb 2/3 Ni 1/3 )O 3 -0.51Pb(Hf 0.3 Ti 0.7 )O 3 (PNN-PHT) ceramics via the solid-state method. By constructing a ferroelectric system in the morphotropic phase boundary region and exploiting the synergistic effect of polar nanoregions and an enhanced local structural heterogeneity, excellent piezoelectricity and dielectric properties are obtained. The optimized piezoelectric coefficient d 33 , dielectric constant ε 33 , electromechanical coupling factor k p , and dielectric loss tanδ are 1125 pC/N, 8667, 0.66 %, and 1.94 %, respectively. The Vogel-Fulcher law and relaxation analysis were adopted to understand the origin of the high piezoelectricity. The Rayleigh analysis method was used to study the intrinsic and extrinsic contributions to the piezoelectricity of the Nd-doped PNN-PHT ceramics, the extrinsic contribution was found to be up to 19 % in the optimal region (PNN-PHT + 0.4 at. % Nd 2 O 3 ). Moreover, according to in-situ ferroelectric measurements and fatigue measurements, the PNN-PHT + 0.4 at. % Nd 2 O 3 ceramic exhibits excellent fatigue resistance and stable piezoelectric behavior at 60 ℃ . This work provides an approach to realize high-performance piezoelectric ceramics with good electromechanical stability under external condition, which is expected to expand the range of application of piezoelectric materials, e.g., for transducers.
研究领域:
材料科学
·
电陶瓷
·
压电材料
·
铁电材料
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DOI
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2021
·
IF 2.858
Meng Yan,Fen Luo,Xiaoyan Shu,Hexi Tang,Shunzhang Chen,Guilin Wei,Yi Xie,Lan Wang,Xirui Lu
As it is pivotal to study the self-irradiation of radioactive contaminated soil under alpha-particle in long term storage, the purpose of this paper is to research the irradiation behavior of 10–30 wt% of Nd 2 O 3 and CeO 2 co-doped glass samples under 0.5 MeV He 2+ irradiation of high fluences from 1.0 × 10 14 to 1.0 × 10 17 ions/cm 2 at room temperature. The results of GIXRD show that the main phases keep amorphous after irradiation. Surface morphology is still smooth and enrichment phenomenon of all the referred elements exist rarely after irradiation by SEM-EDS. Meanwhile, the results of Vickers hardness value and leaching rate test show slightly change whereas the structure of the glass-samples under alpha-particle irradiation are stable. Therefore, this work can offer detailed information for the radiation tolerance of the materials.
研究领域:
材料科学
·
核废物管理
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产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2022
·
IF 4.458
Yang He,Xiaoyan Shu,Lingshuang Li,Mingfen Wen,Guilin Wei,Yuexiang Lu,Yi Xie,Faqin Dong,Shunzhang Chen,Kuibao Zhang,Xirui Lu
Based on the chemical composition and secondary diagenetic property, one type of natural aluminosilicate was proposed as an immobilization matrix for the simulated An 3+ waste (Nd 2 O 3 ). The results show that sintering at 1500 °C for 6 h can be used as a prerequisite for the preparation of the waste form. The loading content of Nd 2 O 3 in the waste form dominated by the glass-ceramic structure can reach 16 wt.%. In this system, as a glass modifier, Nd 2 O 3 improves the mechanical properties of the sample by adjusting the density of Si-O skeleton or by participating in the construction of glass-ceramics. Among them, Nd 3+ attaches to the glass network as a charge compensator, or participates in the crystal. The normalized elemental release rate of Nd is maintained at the order of 10 −5 or below, and approaches equilibrium after 28 days, indicating that the sample own considerable resistance to the harsh environment.
研究领域:
材料科学
·
核废料管理
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Qiang Hu,Tongqing Chen,Lingling Yan,Junhui Yi,Hongxin Cai,Liang Chen,Lingli Wang
A series of Nd 2 O 3 -decorated ZnO nanosheets were successfully synthesized through a facile hydrothermal approach for n-butanol sensing applications. The results demonstrate that Nd 2 O 3 modification significantly improves the sensing performance. The optimal sensor with 7.5 wt% Nd 2 O 3 loading (denoted as Nd2) achieves a high response of 1503.73 toward 100 ppm n-butanol (68 times higher than that of pure ZnO), along with a rapid recovery time of 3 s and a low detection limit of 500 ppb. Furthermore, the sensor exhibits excellent selectivity against common volatile organic compounds (VOCs) and long-term stability. Comprehensive performance analyses reveal that the performance enhancement originates from the synergistic effect of two fundamental mechanisms: the formation of Nd 2 O 3 /ZnO heterojunctions that effectively modulate the electron-depletion layer, and the increased oxygen vacancy concentration that promotes surface redox kinetics. This work not only highlights the application potential of Nd 2 O 3 /ZnO heterostructures in n-butanol detection, but also provides a feasible material design strategy for developing high-performance gas sensors.
研究领域:
材料科学
·
传感器与传感技术
·
纳米材料
·
气体检测
·
环境监测
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wei Ling,Peng Liao,Jiawei Zhu,Jianxin Wu,Caiwei Hu,Xianke Zhang,Jujun Yuan,Zuzhou Xiong,Xiurong Zhu,Chuicai Rong
Metal–organic framework (MOF) derivatives have emerged as promising candidates for designing lightweight, high-performance electromagnetic wave absorption (EMWA) materials owing to their tunable porosity, compositional diversity, and structural flexibility. In this study, a hybrid material (Nd/Fe-MOF) comprising Nd- and Fe-based MOFs was constructed via ion-exchange engineering based on an MOF-plus-MOF strategy, involving partial exchange between Nd³⁺ and Fe³⁺ ions. The subsequent pyrolysis of Nd/Fe-MOF yielded a particle-decorated bundle-like Nd 2 O 3 /Fe@C nanocomposite, which exhibited an exceptional EMWA performance with a minimum reflection loss (RL min )of −60.13 dB and an effective absorption bandwidth (EAB) of 5.0 GHz at a thin thickness of 1.8 mm. Moreover, Nd 2 O 3 /Fe@C also displayed an enhanced absorption with an EAB of 2.1 GHz (5.2–7.3 GHz) at low-frequency C band. This outstanding EMWA behavior can be attributed to the optimized impedance matching induced by the introduction of Nd 2 O 3 , and the prolonged propagation paths of EMW caused by the bundle-like structure. In order to present the practical application, CST simulation showed that the reduction value of radar cross section (RCS) of Nd 2 O 3 /Fe@C could reach up to 32.6 dB m² compared to the pure perfect electric conductor (PEC) substrate. Therefore, this study demonstrates the feasibility of employing ion-exchange engineering for the optimization of electromagnetic parameters and the subsequent development of high-efficiency rare earth–based absorbers.
研究领域:
材料科学
·
纳米技术
·
电磁学
·
微波工程
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产品关联
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
Molecular Catalysis
·
2022
·
IF 5.089
Changhui Zhu,Kaiqiang Wang,Jia Luo,Baohe Tian,Jialin Sun,Xinhong Liu,Wenchao Zhu,Zhiyun Zou
α -Aromatic amino acid esters are important platform compound for drugs, sweeteners and fluorescent sensors. Due to the amphoteric dissociation and steric effect, the esterification of α -aromatic amino acids is difficult. Here, a green and efficient solid superacid, SO 4 2− -S 2 O 8 2− /SnO 2 -Nd 2 O 3 (SSSN), was synthesized and firstly used for the methyl esterification of α -aromatic L-tyrosine and L-tryptophan. The methyl esters yield was optimized with the highest L-TyrOMe yield of 93.1% and L-TrpOMe yield of 92% over SSSN-650 (SO 4 2− -S 2 O 8 2− /SnO 2 -Nd 2 O 3 calcined under 650 °C). Furthermore, it was clarified that the doping of Nd enhanced the electron-withdrawing inductive effect of SO 4 2− /S 2 O 8 2− with increased Brønsted and Lewis acidity, which were beneficial to the esterification of L-tyrosine and L-tryptophan. Besides, Nd-doping reduced the activation energy during L-Tyr esterification by kinetics study. Finally, SSSN-650 could be recycled six times with > 70% of their initial ester yield. The decrease of catalyst activity was caused by carbon deposition and species leaching. This work launched a novelty, rapid and environmental-benign technology for the esterification of α -aromatic amino acid using solid superacid.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Tian Mao,Wenhong Han,Lingshuang Li,Jiaqi Zhao,Longtao Sun,Wendong Zhang,Xirui Lu,Yi Liu,Xiaoyan Shu
This study used Nd 2 O 3 as a simulant for trivalent actinides to systematically investigate the immobilization performance of a natural aluminosilicate glass (amphibolitic granulite). The microstructure and physicochemical properties of the waste forms were characterized in detail by XRD, FTIR, Nd L 3 -edge XANES, EXAFS, and electron microscopy. Their mechanical properties and chemical durability were evaluated via density and hardness measurements, as well as product consistency testing (PCT). The sample with the maximum solid solubility of 38 wt % Nd 2 O 3 exhibits a high density of 3.37 g/cm 3 , a Vickers hardness of approximately 8.19 GPa, and a normalized mass loss of 1.46 × 10 −6 g m −2 after 42 days. Overall, this natural aluminosilicate matrix is a promising candidate for the immobilization of high-level radioactive waste, indicating outstanding physical and chemical stability.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-13
·
IF 2.8
Xiong Zhe,Zhang Xing,Wu Wenjuan,Li Lezhong,Tang Bin
The perovskite-structured CaTiO 3 -based microwave dielectric ceramics play an essential role in the technical field of communication. This study is intended to obtain a temperature-stable Ca-Li-Nd-Ti microwave dielectric ceramic and explore the changing mechanism of dielectric properties. So the (Ca 0.61 Nd 0.26 ) 1- x (Li 0.5 Nd 0.5 ) x Ti 0.96 (Al 0.5 Nb 0.5 ) 0.04 O 3 (0 ≤ x ≤ 0.8, shorted as CLNTAN) microwave dielectric ceramics were designed, prepared and characterized in this paper. All constituents form a single phase of orthorhombic perovskite. SEM images verify that the polygonal grains gradually become cubic morphology as the x value increases for CLNTAN samples. Raman spectra show a distinct blue shift of vibrational modes by increasing the x value, and the broadened Raman peaks indicate a declined tendency of Q × f value. Interestingly, the ε r values of samples reach the maximum at x = 0.7, then decrease as the x value increases. This finding is related to the bond valence at B-site. In addition, the τ f values of samples exhibit a decreased tendency, and the temperature-stable (τ f = –1.4 ppm/°C) CLNTAN ceramic with a high ε r value of 129.2 was obtained at x = 0.76 when it was sintered at 1230 °C.
研究领域:
材料科学
·
通信技术
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2018
·
IF 0.367
Xiaolei Song,Yuan Yu,Chunxia Wang,Mingqiao Ge
Magnetic nanoparticles of Nd-Fe3O4 were prepared by hydrothermal synthesis method, using NdCl3·6H2O and FeCl3·6H2O as the starting materials in this paper. The structure and morphology of nanoparticles were investigated by XRD, FTIR, EDS and TEM. The results showed that, while the addition of Nd at 10% in mole ratio, resulted in the formation of Nd2O3 crystal peak in cubic Fe3O4 nanocrystallites by XRD. The absorption bands of Fe‒O, ‒OH, ‒O‒C‒O‒ and ‒CH2‒ were accordant to the correspondent chemical groups by FTIR. The morphology of the prepared nanoparticles exhibited spherical structure and evenly distributed without agglomeration phenomenon by TEM. The elemental composition were mainly consistent with the precursor materials used in the experiment.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS TRANSACTIONS
·
2017
·Vol. 58
·期 3
·395-399
·
IF 0.713
Xiaolong Liu,Chao Huang,Bing Li
In this paper, the cyclic voltammetry was applied to investigate the electrochemical reduction processes of Nd(III) ions in NdF3-LiF melts with or without excessive metal Nd. Equilibrium experiments were carried out in NdF3-LiF melts with excessive spheric metal Nd to investigate the relationship between the NdF3:LiF mass ratio and NdF2 concentration. Electrolysis experiments were performed in NdF3-LiF-Nd2O3 melts with different NdF3:LiF mass ratios to explore the relationship between the NdF2 concentration and the current efficiency.The results indicated that Nd(III) ions in the melts were reduced in two steps, i.e., Nd(III)→Nd(II) and Nd(II)→Nd(0). NdF2 could be formed by the comproportionation reaction between Nd(III) and Nd(0) and could stably exist in NdF3-LiF melts containing metal Nd(0). NdF2 mass concentration in the melts decreased from 45.5% to 36.4% with the increase of NdF3-LiF mass ratio from 7:3 to 9:1 in NdF3-LiF melts containing excessive spheric metal Nd, which resulted in a higher current efficiency during the electrolysis. And the highest current efficiency of about 50% for Nd extraction has been obtained by electrolysis in NdF3-LiF (9:1 mass ratio) melts with Nd2O3 (2%, mass concentration) at 1423 K.
研究领域:
冶金学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Guofu Yin,Lexin Zhang,Yanchao Li,Wanshun Li,Guobin Qin,Zhen Tian,Fei Ruan,Qingchun Wang,Qiang Jing,Jinxiao Bao
This study used YAG and MgO as composite sintering aids, Nd 2 O 3 doped Si 3 N 4 ceramics were successfully fabricated at 1620 °C using pressure-less sintering. The results demonstrate that an appropriate amount of Nd 2 O 3 significantly enhances the mechanical properties of the material. At a doping level of 6 wt.%, the fracture toughness,hardness and flexural strength were 13.59 ± 0.30 MPa·m 1/2 , 18.41 ± 0.21 GPa and 796.6 ± 46.65 MPa. Phase and microstructural analyses reveal that α-Si 3 N 4 has been largely transformed into β-Si 3 N 4 , accompanied by the formation of rod-like grain morphology. This research confirms that YAG can serve as an effective sintering aid, and when combined with Nd 2 O 3 doping, high-toughness Si 3 N 4 ceramics can be obtained under pressure-less sintering conditions. The findings provide a solid research foundation for the application of Si 3 N 4 ceramics in engineering and defense-related fields.
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DOI
高影响因子
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