CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jinyang Li,Wenye Deng,Yan Xue,Ni Ai,Kai Ding,Xianghui Chen,Pengjun Zhao,Aimin Chang,Yongxin Xie
This study used the solid-phase method to prepare thermosensitive perovskite ceramics, La 0.9 B 0.1 AlO 3 (B = Pr, Nd, Sm). The XRD and EDS results indicated that all components presented a single phase and all elements were uniformly distributed, formed a good solid solution. The SEM results clearly illustrated that the doped elements had enhanced the surface morphology, resulting in more uniform grain formation. The TEM results showed that linear defects were present, which led to an uneven stress distribution; consequently, this enhanced the carrier transport. The alternating current (AC) impedance showed that the grain boundary resistance determined the overall complex impedance and exhibited a different conductive mechanism with increasing temperature, from polariton to ion conduction. With the introduction of Nd 3+ , the conductivity of La 0.9 Nd 0.1 AlO 3 increased and its temperature range increased from 600 – 1400 °C to 100–1500 °C. In La 0.9 Sm 0.1 AlO 3 , the presence of Sm 2+ enhances the aging stability by elevating the oxygen vacancy concentration and the aging drift rate (ΔR/R0) was found to be lower than 2 %. In addition, DFT-based calculations were performed to investigate the property changes in the crystal structure and energy band structure of pure and doped LaAlO 3 . This study demonstrated an effective way to improve the performance of high-temperature thermistor materials using different doping strategies.
研究领域:
材料科学
·
陶瓷
·
电子陶瓷
·
固体化学
·
计算材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuo Huang,Ying Hong,Liye Ding,Kaiyun Li,Haoliang Yuan,Ziang Luo,Shijia Li,Sheng Zhang,Chunhui Xu,Hongyun Jin
High-entropy ceramics have recently emerged as promising candidates for advanced thermal-barrier-coating applications due to their exceptional tunability and thermal stability. In this work, the phase stability, elastic behavior and thermal performance of a non-equimolar high-entropy zirconate (Nd 0.4 Ce 0.15 Sm 0.15 Eu 0.15 Yb 0.15 ) 2 Zr 2 O 7 are systematically investigated through ab initio calculations based on the special quasi-random structure approach, and validated by complementary experimental characterizations. The material preferentially crystallizes into a pyrochlore-type structure, with sharp diffraction peaks and uniform elemental distribution confirming its crystallinity and compositional homogeneity. The elastic behavior is analyzed by single-crystal and polycrystalline elastic moduli using a series of phenomenological models. The broad distribution of metal-nonmetal bond lengths highlights large distortion fluctuations, which strongly influence the intrinsic materials parameters. The material exhibits high Vickers hardness (18.2 GPa) and thermal expansion coefficient (11.77 × 10 -6 K -1 at 1773 K), exceeding that of pristine Nd 2 Zr 2 O 7 and conventional yttria-stabilized zirconia. Additionally, the severe lattice distortion induces strong phonon scattering, resulting in low thermal conductivity (1.16 W⋅m -1 ⋅K -1 at 1773 K). The integrated theoretical-experimental study provides critical insights for the rational design of high-entropy materials for extreme-temperature applications.
研究领域:
材料科学
·
陶瓷学
·
热障涂层
·
计算材料物理
·
固态化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Ren Peng,Yang Yang,Liu Dai,Guan Cheng-peng,Huang Pin-wen,Qi Ming
A novel extraction process utilizing THEE-BisDGA ligand has been developed for the rapid and efficient recovery of trivalent lanthanide elements (La, Nd, Eu, and Dy) from uranium-containing acidic systems. The process rapidly achieves equilibrium within just 2 min and exhibits high distribution ratios. Notably, its extraction efficiency shows a positive correlation with the atomic number of the lanthanides. Significantly, the ligand demonstrates exceptional selectivity by excluding U(VI) extraction, thus enabling the targeted recovery of lanthanides. Back-extraction experiments confirm that 0.01 M HNO 3 can quantitatively strip lanthanides in three steps, highlighting its potential for industrial-scale separation and purification of valuable lanthanides. Moreover, density functional theory(DFT) calculations have confirmed that THEE-BisDGA exhibits superior selectivity for Ln(III) over U(VI), further reinforcing its effectiveness and applicability in advanced separation technologies.
研究领域:
化学工程
·
无机化学
·
分离科学
·
材料科学
·
核化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ruihan Li,Feng Hu,Ran Wu,Jianyi Xu,Jin Xu,Zhonghui Hou,Min Zhou,Junyu Bai,Yanghuan Zhang
In the present study, the synthesis of NdMg 12 + x wt%Ni( x = 0, 5, 10, 15) alloy was effectively accomplished through the technique of ball milling , and the profound impact of Ni on the microstructural attributes, as well as the hydrogen absorption and desorption characteristics of NdMg 12 alloy, was meticulously examined. The microstructural analysis reveals that Ni can notably facilitate the development of nanocrystalline and amorphous structural configurations. Subsequent investigations uncovered that a portion of Ni was transformed into the Mg 2 Ni phase on the surface of the NdMg 12 alloy, thereby increasing the number of hydrogen absorption active sites and subsequently enhancing the hydrogen absorption and desorption capabilities of the NdMg 12 +Ni alloy. A thermodynamic analysis reveals that the incorporation of Ni exerts a substantial elevating effect on the hydrogen desorption plateau pressure of NdMg 12 +Ni alloy. As the Ni content escalates from 0 wt% to 5 wt%, the enthalpy of the hydrogen desorption process plummets significantly, from 89.1888 kJ/mol H 2 to 80.2806 kJ/mol H 2 . Concurrently, the addition of Ni markedly diminishes the hysteresis coefficient during hydrogen absorption and desorption, thereby enhancing the overall hydrogen absorption and desorption efficiency of NdMg 12 +Ni alloy. Moreover, the inclusion of Ni not only expedites the hydrogen absorption rate within the NdMg 12 +Ni alloy but also substantially diminishes the activation energy for hydrogen desorption, effectively lowering the minimal hydrogen desorption temperature from 261℃ to 199℃. Notably, the NdMg 12 + 10 wt%Ni alloy exhibited the lowest activation energy (Ea = 114.4995 kJ/mol) and demonstrated superior hydrogen desorption kinetics.
研究领域:
材料科学
·
金属氢化物
·
储能材料
·
固态储氢
·
物理化学
·
合金设计
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 31
·16040-16051
·
IF 5.1
Jin Zhou,Tong Shi,Ri-Tao Huang,An-Di Liu,Gao-Shang Gong,Yong-Qiang Wang,Lang-Sheng Ling,Jing-Xin Li,Yu-Yan Han,Wei Tong,Zheng-Cai Xia,Zhao-Ming Tian
The diverse exotic magnetic states realized in one-dimensional (1D) spin-chain systems have motivated the extensive exploration of new materials with a 1D spin-chain motif, while 1D magnets comprising rare-earth (RE) ions are largely unexplored compared with their 3d transition metal (TM)-based counterparts. Herein, we report the synthesis and magnetic properties of a family of RE-based zigzag spin-chain Ba2REV3O11 compounds (RE = Pr, Nd, and Gd–Ho) crystallized into a monoclinic structure with the space group P21/a, wherein spin chains are connected by edge-sharing REO6 octahedra along the b axis and well separated by nonmagnetic VO4 tetrahedra extended within the ac plane. Moreover, the nearest neighbor (NN) intrachain RE–RE distance (dintra, ∼3.856–3.952 Å) is much shorter than the NN interchain separation (dinter, ∼5.191–5.246 Å), supporting quasi-1D characteristics. Magnetic susceptibility and isothermal magnetization measurements revealed that only Ba2DyV3O11 displays a magnetic anomaly at ∼2.9 K and other family members do not order down to 1.8 K. Among them, Ba2GdV3O11 with a spin-only magnetic moment (S) of 7/2 exhibits a long-range magnetic order with TN ∼ 0.67 K and a large magnetocaloric effect with a maximum magnetic entropy change (ΔSM) of 14.3 J K−1 (mol-Gd)−1 under a magnetic field change (Δμ0H) of 4 T at a temperature of ∼1 K, making it a suitable material for magnetic refrigeration in sub-Kelvin temperature regimes.
研究领域:
凝聚态物理
·
磁性材料
·
固态化学
·
低温物理
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuzhe Zhang,Zhenhao Fan,Jie Hua,Xin Gao,Liwei Lin,Zhongyu Li
Neodymium is a crucial strategic resource, which requires enhanced adsorption and recovery methods. Various researchers have utilized chitosan as an adsorbent for neodymium element adsorption. However, the low surface negative charge of the chitosan adsorbent affects its adsorption efficiency, and its inadequate mechanical properties hinder reusability. To address these issues, this study developed two composite membranes: the 3D wood imprinted carboxylated chitosan composite membrane (3DW-ICNTs/COOH/CS) and the 3D wood carboxylated chitosan composite membrane (3DW-CNTs/COOH/CS) for the separation and recovery of rare earth Nd(III). Kinetic experimental results indicate that both composite membranes reached 80% of maximum adsorption capacity within 200 min, indicating the significant negative charge on the surface of the carboxylated carbon nanotube-modified chitosan material. Even after ten adsorption and desorption cycles, imprinted composite membranes maintained a removal rate of about 80%. The utilizing delignified wood as a support material preserved the mechanical properties of the composite membrane, thereby providing a favorable condition for its industrial application.
研究领域:
材料科学
·
环境工程
·
化学工程
·
高分子科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 9
·5571-5582
·
IF 3.917
Zheng Xudong,Zhang Yi,Bian Tingting,Wang Dandan,Li Zhongyu
Previously, we investigated imprinted silica films templated by cellulose nanocrystals for the selective adsorption of rare earth ions from acidic systems, but the cost of organosilane limits the application of silica film adsorbents. Considering the cost and outstanding properties of cellulose, converting this renewable biological resource into an adsorbent material is a vital step towards sustainable development. One-step fabrication of imprinted mesoporous cellulose nanocrystals films (IMCFs) was implemented via ionic imprinting technology and they were applied to efficiently and selectively separate neodymium ions [Nd(III)]. Transmission photographs clearly demonstrated there is a highly ordered mesoporous structure after removal of silicon source. Nitrogen adsorption measurements showed two obtained materials possess high specific surface area, providing a good premise for efficient separation. When employed as absorbents, the maximum adsorption capacity of IMCFs is almost three folds than that of NIMCFs, reaching 18.22 mg g −1 . The distribution coefficient of IMCFs for Nd(III) reached 435.46 mL g −1 , much higher than other interfering ions. Repeatability tests showed IMCFs retained 81.55% of initial adsorption capacity after five adsorption cycles. In summary, this work presents a new avenue to construct imprinted mesoporous cellulose nanocrystals films for separation of rare earth ions.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yi Ding,Zhengdi Jiang,Yanjun Li,Hui Dan,Xirui Lu,Yushan Yang,Tao Duan
Zircon , ZrSiO 4 , has a structure that can incorporate actinides. Therefore, the susceptibility of the zircon structure to irradiation damage has been investigated by accelerated irradiation experiments. Synthetic Zr 1− x Nd x SiO 4− x /2 ( x = 0, 0.01, 0.10) ceramics were irradiated with 0.5 MeV 4 He 2+ ions (fluences 1 × 10 14 –1 × 10 17 ions/cm 2 ) at room temperature. The irradiation effects on phase structure and chemical stability of the ceramics were investigated. It is found that the main crystal structure is maintained, however, little amorphization is leaded as a result of intensified irradiation. Raman spectra reveal that the main peaks slightly broaden and weakened with increasing fluence, indicating little amorphization has been induced by irradiation. The irradiation resistance is enhanced by the growing neodymium content. Moreover, microtopography and element distribution have no changed even after irradiation. Although the LR Nd increases slightly with increasing Nd loading and irradiation, the excellent chemical stability (∼10 −4 g m −2 d −1 ) is maintained.
研究领域:
材料科学
·
核科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Maowa Zhang,Haiqing Hao,Chenxi Shi,Chongchong Chen,Guoli Zhou,Jingtao Wang,Yijun Cao,Xiangke Han
Nd is a strategic metal, but its extraction and separation process remains a challenging task. Here, ion-imprinted membranes with six-coordinated and semi-rigid imprinted nanocage structure were developed by self-assembling terpyridine monomers in the confined reduced graphene oxide (rGO) nanochannels. The obtained membranes displayed excellent Nd(III) adsorption capacity of 20.6 mg g −1 in the solution including seven rare earth elements (REEs), together with a 7.68 times higher selectivity to Y(III). Experimental measurements and theoretical calculations revealed that Nd(III) was well coordinated to the six pyridine-nitrogen in the nanocage, which showed shorter average coordination bond (0.77 Å) and stronger binding energy (-10.52 eV) than other REEs. These were mainly attributed to the rigid symmetrical crab-type architecture and specific cavity size of bis-terpyridine nanocage. Meanwhile, the limited decomposition of these metastable nanocage derived from 2D confined effect and nanochannel walls with few groups reduced the interference of groups at non-imprinted sites on selective adsorption. The excellent anti-swelling property of rGO framework endowed 7 static adsorption cycles and maintained high selectivity (K' (Nd/Y) > 7). Integrated into account the well-defined semi-rigid sites constituted by non-covalent interactions, this strategy provided a new idea for facile synthesis of imprinted sites with higher selectivity.
研究领域:
材料科学
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Zhengdi Jiang,Zhen Li,Zhenyu Chen,Xuanrui Zhang,Weijie Fan,Yuan Liu,Hui Dan,Yi Ding,Tao Duan
Zircon (ZrSiO 4 ) ceramics were widely used in the field of nuclear waste immobilization because of their excellent properties. However, the SiO 2 /ZrSiO 4 ceramics were usually obtained in the preparation of ZrSiO 4 . The actinides immobilization behavior of SiO 2 /ZrSiO 4 ceramics is unclear. Herein, Nd-doped 0.2SiO 2 /Zr 1- x Nd x SiO 4- x /2 (0≤ x ≤ 0.1) ceramics were fabricated and the effects of Nd-doping and sintering temperature on their phase and microstructure evolution were investigated. The obtained ceramics were characterized by XRD , SEM, BSE and EDS . Results show that 0.2SiO 2 /Zr 1- x Nd x SiO 4- x /2 ceramics with 0≤ x < 0.04 are ZrSiO 4 phase; while with 0.04≤ x ≤ 0.1 are coexistence of ZrSiO 4 and Nd 2 Si 2 O 7 phases. The solubility limit of Nd 3+ in 0.2SiO 2 /ZrSiO 4 is about 4 at%. The lattice volume of ZrSiO 4 increased with increasing Nd-doped content and sintering temperature. Furthermore, higher Nd-doped content and sintering temperature are beneficial to the densification of the obtained ceramics. The results demonstrate that the 0.2SiO 2 /ZrSiO 4 ceramics can be employed as waste form materials to immobilize trivalent actinides.
研究领域:
材料科学
·
核工程
·
陶瓷
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 5
·2134-2142
·
IF 3.784
Yafei Liu,Zhilong Fu,Xingyu Chen,Yaxin Wei,Bo Zhang,Aimin Chang
Rare-earth ions doped Ca 0.9 R 0.1 CeNbMoO 8 ( R = Y, Sm, Nd, La) ceramics have been successfully prepared by solid-state method, and their modifications to the microstructure and electrical properties are also investigated. The rare-earth ions doped ceramics exhibit the scheelite structure. With the increase in the radius of rare-earth ions, the lattice distortion and bond interaction will be enhanced, and the consistency of grain size will be reduced. The ceramics exhibit negative temperature coefficient (NTC) thermistor characteristics in the temperature range of 473 K-1273 K, and the activation energy decreases with the increase of the radius of rare-earth ions. Rare-earth ions doping can increase the content of Ce 3+ ions and promote the conductivity of ceramics. Except for Sm 3+ -doped ceramics, the high-temperature aging rate of other ceramics is less than 2%. The existence of some metastable Sm 2+ ions in Sm 3+ -doped ceramics not only increases the activation energy, but also reduces the high-temperature stability of the ceramics.
研究领域:
材料科学
·
固态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70415
·
IF 3.8
Qing Tao,Junxia Wang,Jin Wang,Xi Zhang,Yuan Liu,Die Liu,Kunqi Liu
In this study, a series of (1- x )Sr 0.5 Zr 2 (PO 4 ) 3 - x (Ce 1-2 y Nd y Sm y )PO 4 (abbreviated as SrZP-(Ce, Nd, Sm)PO 4 , x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1; y = 0, 1/12, 2/12, 3/12, 4/12, 5/12, 6/12) dual-phase ceramic waste forms were fabricated through a one-step microwave sintering technique. The phase evolution, micromorphology, and densification behavior of these ceramics were systematically investigated using XRD, Raman spectroscopy, SEM-EDS, and density measurement. The results confirmed that the dual-phase ceramics exclusively consisted of SrZP and (Ce, Nd, Sm)PO 4 phases, which coexisted stably and independently, enabling simultaneously effective immobilization of simulated fission products (Sr 2+ ) and actinides radionuclides (Ce 3+ , Nd 3+ , and Sm 3+ ). The ceramics exhibited a homogeneous distribution of both phases, a compact micromorphology, and relative densities achieving a maximum of 98.9%. It was demonstrated that alterations in the phase content ( x value) induced only negligible variations in the lattice parameters of both crystalline phases, indicating minimal structural perturbations. Rietveld refinement analysis revealed a gradual reduction in the lattice parameters of the (Ce, Nd, Sm)PO 4 phase with increasing y value, consistent with the anticipated immobilization of the simulated actinide radionuclides. In addition, by integrating XRD and Raman analyses, the temperature-induced phase evolution of the representative sample SrZP-Ce 1/3 Nd 1/3 Sm 1/3 PO 4 was comprehensively characterized. The results indicated that the Ce 1/3 Nd 1/3 Sm 1/3 PO 4 phase preferentially formed over the SrZP phase during the dual-phase ceramic preparation. Furthermore, the Kissinger model based on TG-DSC results at various heating rates ( β T = 10, 15, 20, and 25 K/min) provided additional thermodynamic evidence, in which the Ce 1/3 Nd 1/3 Sm 1/3 PO 4 phase possessed a lower apparent activation energy (353.35 kJ/mol) than the SrZP phase (501.33 kJ/mol). Besides, the SrZP-Ce 1/3 Nd 1/3 Sm 1/3 PO 4 dual-phase ceramic waste form demonstrated high chemical stability, with normalized leaching rates of all elements remaining relatively low ( LR Sr ∼ 10 −4 g·m −2 ·d −1 , LR Ce ∼ 10 −7 g·m −2 ·d −1 , LR Nd ∼ 10 −7 g·m −2 ·d −1 , and LR Sm ∼ 10 −6 g·m −2 ·d −1 ).
研究领域:
材料科学
·
核废料处理
·
陶瓷材料
·
固态化学
·
辐射材料科学
✓ 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）