JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Shaoxiong Feng,Weigang Ding,Yan Zhang,Jingwei Wu,Zhiming Zou,Tongfa Wu,Qun Tang
A novel neodymium-based metal-organic framework (Nd-MOF) {[Nd 2 (Hpdc) 3 (H 2 O) 6 ]·3H 2 O} n (H 3 pdc = 1H-pyrazole-3,5-dicarboxylic acid) was synthesized by a simple hydrothermal method and structurally characterized. By dropped onto glassy carbon electrodes (GCE), the prepared Nd-MOF was applied to construct an efficient electrochemical sensor for the rapid and reliable electrochemical detection of Rhodamine B (RhB). This proposed Nd-MOF/GCE sensor exhibited strong accumulation ability and high electrocatalytic activity for RhB. Electrochemical oxidation signal of RhB at the Nd-MOF/GCE was greatly enhanced as compared to that at the bare GCE. The effective factors such as pH of buffer solution , amount of Nd-MOF suspension and accumulation time were optimized for the quantitative detection of RhB. Under optimum conditions, the fabricated sensor showed two wide linear ranges of 0.08–2.0 and 2.0–40 μM with a low detection limit of 3.6 nM, which was ascribed to the advantages of Nd-MOF such as large specific surface area, multiple active sites, strong accumulation ability. Moreover, the developed Nd-MOF/GCE sensor displayed good selectivity and accuracy towards RhB detection in the actual samples. Thus, this simple and efficient approach for RhB detection has good prospective for application in environmental monitoring.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Lan Wang,Xiaoyan Shu,Facheng Yi,Dadong Shao,Kuibao Zhang,Haibin Zhang,Xirui Lu
A series of Nd and Ce co-doped Gd 2- x Nd x Zr 2- y Ce y O 7 (0.0 ≤ x , y ≤ 2.0) ceramics were rapidly fabricated through spark plasma sintering (SPS) within 3 min. The effects of Nd and Ce contents on the phase composition, lattice parameter , active modes, microtopography and microstructure have been investigated in detail. XRD studies reveal that the compositions corresponding to 0.0 ≤ y ≤ 1.0 show a single phase and beyond 1.0 exhibit multiphase. The lattice parameters increase with elevated Nd and Ce content. The grains are densely packed on each other with cube-like shape, and the elements are almost homogeneously distributed in the compound. This synthetic method provides a simple pathway for the preparation of highly densified single phase ceramic at 1600–1700 ℃ for 3 min under pressure of 80 MPa.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Pengju Chen,Hao Zhang,Nan Zhou,Xian Tang,Yanquan Ouyang,Decai Peng,Tian Tian
A series of Nd-doped nanocrystalline Gd 2- x Nd x Hf 2 O 7 (GNHO, 0.0 ≤ x ≤ 2.0) ceramic samples, serving as nuclear waste forms, were synthesized via the sol-gel method combined with cold pressing and sintering. The microstructure, phase evolution, Raman spectral characteristics, and aqueous durability of these GNHO samples were systematically investigated. Results revealed that all GNHO samples formed a single pyrochlore structure sintering at 1673 K for 20 h. With the increase of x Nd from 0 to 2.0, the average grain size of the samples gradually increased from 162 nm to 294 nm, while their actual density gradually decreased from 8.21 to 7.83 g·cm -3 . After 42 days of testing, the normalized release rates of Nd and Hf elements in the Nd 2 Hf 2 O 7 sample were slightly lower than those of Gd and Hf elements in the Gd 2 Hf 2 O 7 sample. This observation can be attributed to the lower porosity of the Nd 2 Hf 2 O 7 specimen and the higher bond energy of Nd–O bond (∼753 kJ/mol) compared to that of Gd–O bond (∼716 kJ/mol). Furthermore, the normalized release rates of all investigated elements were below 10 −5 g·m -2 ·d -1 , exhibiting excellent aqueous durability. First-principles calculations further confirmed that Nd 2 Hf 2 O 7 ceramic exhibits higher structural stability than Gd 2 Hf 2 O 7 .
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70369
·
IF 3.8
Jiarun Wang,Yong Ge,Youkui Zhang,Baoliang Xu,Shuyang Li,Shiyin Ji,Shengtai Zhang,Tao Duan
The disposal of high-level waste, particularly the management of long-lived actinides after immobilization, requires a thorough assessment of the long-term stability of nuclear waste forms in underground repositories. In this work, the garnet Ca 1.5 Nd 1.5 Zr 1.5 Fe 3.5 O 12 was successfully synthesized via high-temperature solid-phase sintering at 1300°C, exhibiting excellent phase purity and microstructural integrity. The chemical stability of the garnet waste form was evaluated under various conditions, including acidic, alkaline, saline, oxidizing environments, and deionized water. Both static and semi-dynamic leaching methods were employed to investigate the leaching mechanisms in different solutions. In acidic leachate, the normalized leaching rate initially increased before decreasing, as the dominant leaching mechanism shifted from slow dissolution and surface reactions to long-term diffusion. In the other four conditions, surface dissolution and internal diffusion processes primarily controlled the leaching mechanism. Ca 1.5 Nd 1.5 Zr 1.5 Fe 3.5 O 12 demonstrated outstanding thermal stability and corrosion resistance, positioning it as a promising candidate for the immobilization of actinide nuclear waste.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Kun Qian,Zhengjun Yao,Haiyan Lin,Jintang Zhou,Azhar Ali Haidry,Tongbaihui Qi,Wenjing Chen,Xinlu Guo
Nanocrystalline Ni–Zn ferrites with different neodymium contents (Ni 0.5 Zn 0.5 Nd x Fe 2-x O 4 ) were synthesized by sol-gel route combined with self-propagating combustion (SPC) method. The presence of surface functional groups, crystal structure and morphology of the samples were studied by FT-IR, XRD and SEM. The results show that the prepared samples are composed of spinel phase under the condition of low neodymium content, like the pure Ni–Zn ferrite. While neodymium oxide appears after the content of Nd 3+ exceeds a certain limit (x > 0.04) and there exist two phases in the ferrite. The results of vibrating sample magnetometer (VSM) and vector network analyzer (VNA) show that adjusting the content of Nd is significant in improving the dielectric properties and microwave absorption capacity of the materials, specifically at low frequencies. When x < 0.04, the enhancement of dielectric loss ability of spinel ferrites by doping Nd 3+ is the dominant factor affecting microwave absorption ability of samples. The secondary phase Nd 2 O 3 hardly appears under this condition, thus the weakening effect of Nd 3+ addition on magnetic loss ability is not obvious. When x = 0.04, the optimal absorption peak of the material reaches −20.8 dB at 4.4 GHz with a thickness of 8.5 mm and the effective absorption bandwidth (R L < −10 dB) was 3.2 GHz. On the contrary, when x > 0.04, the magnetic loss ability decreases rapidly (e.g., Ms decreases from 82.47 emu/g to 59.77 emu/g). Meanwhile, the dielectric loss increases slowly and the microwave absorption capacity decreases.
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高影响因子
ACTA MATERIALIA
·
2024
·
IF 8.3
Qinghu Guo,Xiangyu Meng,Dongxu Li,Zhonghua Yao,Huajun Sun,Hua Hao,Hanxing Liu,Shujun Zhang
Electrostrictive materials play an important role in the development of high precision actuators, due to the advantages of high resolution, low power dissipation and fast response time. However, the practical application of electrostrictive materials has been hindered by their limited displacement output. To address this, we conducted a study where we doped Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) ceramics with Nd 2 O 3 , aiming to significantly improve the electrostrictive effect by enhancing local structural heterogeneities that disrupt the formation of long-range ordered ferroelectric domains. We obtained an optimized electrostrictive strain of 0.231 % with negligible hysteresis at an electric field of 50 kV/cm in 4 %Nd-doped PMN-PT ceramic, surpassing the performance of state-of-the-art lead-based electrostrictive ceramics. Of particular significance is that a high electrostrictive coefficients M 33 = 12.2 × 10 −16 m 2 /V 2 , together with a high mechanical work density of 0.035 J/cm 3 and a low power dissipation of 14 %, was achieved under a mechanical prestress of 50 MPa and an electric field of 10 kV/cm. Additionally, this material exhibits excellent fatigue resistance , with less than 3 % variation over 10 6 operation cycles. All these findings position 4 %Nd-doped PMN-PT ceramics as a promising candidate for high-performance electromechanical actuator applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 12
·1-16
·
IF 2.8
Wang Fenglin,Mao Haijun,Chen Xingyu,Li Wei,Liu Zhuofeng,Zhang Weijun,Bai Shuxin
In this work, A -site Nd doped BaTiO 3 ceramics in the form of Ba 1− x Nd 2 x /3 TiO 3 with a wide substitution level range of x = 0–0.2 have been prepared via solid-state reaction method. Powder X-ray diffraction results reveal that Nd is completely incorporated into the BaTiO 3 lattice in all specimens. Further analyses based on Rietveld refinement suggest that tetragonal and pseudo-cubic phases coexist in Ba 1− x Nd 2 x /3 TiO 3 ceramics with x ≤ 0.06, and the amount of tetragonal phase is raised with the increase of x value. When x value is larger than 0.08, only pseudo-cubic is observed. The generated \(V^{\prime\prime}_{{{\text{Ba}}}}\) , \({\text{Nd}}_{{{\text{Ba}}}}^{\cdot }\) and \(V_{{\text{O}}}^{{\cdot \cdot }}\) defects, which are identified by X-ray photoelectron spectra, make the grain size displays a tendency of decrease first mainly due to the pining effect, and then increase ascribed to the accelerate of mass diffuse. By introducing such wide range of substitution level, Ba 1− x Nd 2 x /3 TiO 3 ceramics with colossal dielectric constant ( x = 0.08), temperature-stable dielectric properties ( x = 0.15), especially relaxor behavior ( x = 0.20) noticed for the first time, are, respectively, received, which is closely related to the variation of phases and defects induced by the addition of Nd. This study may provide a special idea to modify BaTiO 3 to satisfy diversified applications by single element with a wide doping range, and could lay the foundation of future works focusing on the various potential applications of Ba 1− x Nd 2 x /3 TiO 3 ceramics.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 9
·5494-5502
·
IF 3.094
Weijia Guo,Jie Zhang,Yu Luo,Zhenxing Yue,Longtu Li
Ba 4 (Sm 0.15 Nd 0.85 ) 9.33 Ti 18- z Al 3 z /4 O 54 (BSNT- z Al, 0.0 ≤ z ≤ 2.5) ceramics were prepared via a solid-state reaction, and the effects of Al doping on the microwave dielectric properties and defect behavior of the title compound were studied. X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) photographs suggested that Al ions successfully entered the lattice to form tungsten-bronze-like solid solutions. With a small amount of Al substitution, the relative dielectric constant (ε r ), and the temperature coefficient of resonant frequency ( τ f ) values decreased, whereas the quality factor ( Q × f ) substantially increased by approximately 50%. The defect-related extrinsic dielectric loss was clarified via the thermally stimulated depolarization current (TSDC) technique. With Al doping, the TSDC relaxation of across-grain-boundary oxygen vacancies ( ) vanished, whereas that of defect dipoles ( ) appeared at relatively low temperatures. Therefore, in the BSNT- z Al ceramics, oxygen vacancies were more inclined to interconnect with to form defect dipoles. This could reduce the activity of and account for the notable improvement in the Q × f values. In particular, the excellent characteristics of ε r = 67.33, Q × f = 16 530 GHz, and τ f = +0.87 ppm/°C were achieved in the specimens with z = 1.5 sintered at 1350°C for 4 hours.
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高影响因子
ACS Sensors
·
2023
·
IF 8.9
Huajing Wang,Rui Xiong,Zhou Cui,Jie Wan,Baisheng Sa,Xiao Wu,Wulin Song,Xiaoxia Wang,Dawen Zeng
The problems of lithium-ion battery (LIB) failure have attracted growing attention since flammable and explosive electrolyte leakage might lead to serious consequences. However, due to the redox-neutral and volatile nature of main electrolyte components, such as dimethyl carbonate (DMC), trace leakages are difficult to detect. Therefore, research on LIB electrolyte sensors is urgent and lacking. Herein, sensors based on rare-earth Nd-doped SnO2 nanofibers are reported for detecting DMC vapor in LIB. The excellent sensitivity (distinct response to 20 ppb DMC), high response (∼38.13–50 ppm DMC), and superior selectivity and stability of 3%Nd-SnO2 suggest that it should be a promising candidate for LIB safety monitors. Meanwhile, it also shows clear and rapid response during the LIB-leakage real-time detection experiment. The doping of Nd endows SnO2 with more oxygen vacancy defects. In addition, the highly active Nd sites greatly enhanced the adsorption energy of DMC on SnO2. All of these features contribute to the improvement of DMC-sensing performances.
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PubMed
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.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Yi Ding,Xirui Lu,Hui Dan,Xiaoyan Shu,Shuai Zhang,Tao Duan
Zr 1− x Nd x SiO 4− x /2 (0≤ x ≤0.1) ceramics were prepared by solid-state reaction method. The effects of Nd content on the phase structure of the ceramics were investigated. The chemical durability of Nd-doped zircon ceramic waste forms was also examined. The results show that the ceramics with x <0.04 show homogeneous single zircon phase, while the samples with x ≥0.04 e x hibit coexistence of two crystal phases (zircon and Nd 2 Si 2 O 7 ). The bulk density of the Nd-doped zircon ceramics increases with the increase in neodymium content. Moreover, the normalized element release rates of Nd element in Nd-doped zircon ceramics firstly decrease with leaching time and almost no change after 14 days (~10 −4 g m −2 d −1 ), demonstrating its good chemical durability. These results indicate that the obtained zircon ceramics waste forms are promising candidate for immobilization of trivalent actinides.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 25
·1-13
·
IF 2.8
Lu Jiajun,Kong Wenwen,Xie Juntao,Zhao Yan,Zhao Qing,Chang Aimin
High-temperature thermistors face significant challenges in maintaining stability under extreme temperature conditions, meaning that stringent requirements for material selection and structural design are needed. To address this issue, negative temperature coefficient (NTC) thermistor ceramics of Ba 2 ReNbO 6 (Re = La, Nd, and Sm) were successfully prepared using the solid-state reaction method. X-ray diffraction (XRD) analysis revealed that Ba 2 ReNbO 6 (Re = La, Nd, and Sm) had an ordered double perovskite structure. Scanning electron microscopy (SEM) revealed that as the difference in cationic radii between B′/B″ decreased, the porosity of the materials gradually increased. After Ba 2 ReNbO 6 (Re = La, Nd, and Sm) underwent aging tests at 1173 K for 720 h, the resistance drift rates were 1.33, 3.80, and 5.88%, respectively, and the aging mechanism was explained using cation diffusion theory. These ceramics exhibited typical NTC characteristics over a wide temperature range from 773 to 1473 K, with the degree of linearity exceeding 0.999 for all the samples.
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高影响因子
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