INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Ling Wang,Mei Yan,Min Li,Zheng-Yu Yang,Xian Li,Wenfeng Zhou,Ru-Ling Tang
Zirconium/hafnium fluorides have recently garnered considerable interest as potential optical materials, owing to their short ultraviolet (UV) cutoff edges. Transforming centrosymmetric (CS) structures into noncentrosymmetric (NCS) analogues through cationic regulation has proven to be an effective approach for the development of nonlinear-optical (NLO) materials. Herein, various Zr/Hf-based fluorides with different alkali-metal cations, including K8M5F28(H2O) (M = Zr(1), Hf(2)), CsNaHfF6 (3), and LiK10M6F35(H2O)2 (M = Zr(4), Hf(5)), were synthesized. 1–3 belong to centrosymmetric space groups, whereas 4 and 5, incorporating the Li+ cation with a small radius, exhibit NCS crystal structures. 1 and 2 feature chain-like anionic structures. 3 presents a zero-dimensional (0D) anionic structure constructed from isolated [HfF6]2– octahedra. Compounds 4 and 5 adopt three-dimensional (3D) anionic networks. The introduction of Li+ enhances structural distortion and dipole alignment, resulting in phase-matchable (PM) second-harmonic-generation (SHG) responses. Notably, all compounds exhibit UV absorption edges below 200 nm, confirming superior UV transparency. Overall, these results indicate that alkali-metal regulation is an efficient approach to trigger symmetry breaking while concurrently enabling SHG activity and maintaining short UV absorption edges.
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PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 6
·1441-1450
·
IF 7.2
Chen Xunlei,Chen Lin,Tian Jiang,Xu Cheng,Liao Jiaxin,Li Tianyu,Wang Jiankun,Feng Jing
Thermal and mechanical properties of yttrium tantalate (YTaO 4 ), a top coat ceramic of thermal barrier coatings (TBCs) for aeroengines, are enhanced by synthesizing Y 1− x Ta 1− x M 2 x O 4 (M = Ti, Zr, Hf; x = 0.06, 0.12, 0.18, 0.24) medium-entropy ceramics (MECs) using a two-step sintering method. In addition, the thermal conductivity, thermal expansion coefficients (TECs), and fracture toughness of MECs were investigated. An X-ray diffraction study revealed that the Y 1− x Ta 1− x M 2 x O 4 MECs were monoclinic, and the Ti, Zr, and Hf doping elements replaced Y and Ta. The variations in atomic weights and ionic radii led to disturbed atomic arrangements and severe lattice distortions, resulting in improving the phonon scattering and reduced thermal conductivity, with Y 1− x Ta 1− x M 2 x O 4 MECs ( x = 0.24) exhibiting the lowest thermal conductivity of 1.23 W·m −1 ·K −1 at 900°C. The introduction of MO 2 increased the configurational entropy and weakened the ionic bonding energy, obtaining high TECs (10.4 × 10 −6 K −1 at 1400°C). The reduction in the monoclinic angle β lowered the ferroelastic domain inversion energy barrier. Moreover, microcracks and crack extension toughening endowed Y 1− x Ta 1− x M 2 x O 4 MECs ( x = 0.24) with the highest fracture toughness of (4.1 ± 0.5) MPa·m 1/2 . The simultaneous improvement of the thermal and mechanical properties of the MO 2 (M = Ti, Zr, Hf) co-doped YTaO 4 MECs can be extended to other materials.
研究领域:
材料科学
·
机械工程
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yi Yao,Zixin Gao,Zhongjie Pan,Yanping Zhong,Lili Qin,Kexin Zhao,Shuhan Liu,Shengqing Zhang,Haoyang Han,Feiying Yin,Ruizheng Liang,Jinmin Zhao,Li Zheng
Platinum (Pt)-based nanozymes that effectively exert antioxidant effects exhibit great potential in the treatment of osteoarthritis (OA). However, these nanozymes are easy to agglomerate and have low catalytic efficiency, which can hardly meet the criterion of clinical therapy. To achieve efficient ROS removal, this study develops a novel ultrasound (US)-responsive piezoelectric nanozyme (MOF(Hf)-Pt) based on Pt with multi-enzyme mimicking activities and metal-organic frameworks (MOFs) with excellent piezoelectric properties. Results show that MOF(Hf)-Pt has excellent piezocatalytic enzyme activity, which can be adjusted by varying the intensity and time of US. Mechanistically, MOF(Hf)-Pt can increase ATP output and restore mitochondrial function, thereby reducing inflammatory factor levels. In vivo studies also reveal that under suitable US action, MOF(Hf)-Pt nanozymes can effectively inhibit the deterioration of OA, with reductions in OARSCI scores of 76.90 % and 82.66 % after 4 and 8 weeks, respectively. Particularly, the piezoelectric catalytic effect generated by MOF(Hf)-Pt can reverse oxidative stress-induced articular cartilage damage and promote cartilage regeneration, making it a promising candidate for OA treatment.
研究领域:
纳米医学
·
催化
·
生物医学工程
·
炎症性疾病
·
诊疗学
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Xiao-Hui Yang,Guo-Hua Zhang
The preparation of dense single-phase boride ceramics has always been a challenge. In this paper, single-phase W 2 B 5 ceramic with excellent performance was successfully prepared using W 2 B 5 powder and SPS-HF technology. Under the sintering condition of 1800 °C and 50 MPa, a nearly dense W 2 B 5 ceramic material with excellent mechanical properties was obtained. The relative density of the as-sintered W 2 B 5 ceramic achieved 96.72 % without any sintering additive. Additionally, the Vickers hardness , fracture toughness as well as bending strength were 30 GPa (9.8 N), 5.39 MPa·m 1/2 and 522.7 MPa, respectively. The outstanding hardness and bending strength of W 2 B 5 ceramic could be attributed to its monophase W 2 B 5 structure and high densification degree. The primary fracture mode of W 2 B 5 ceramic was transgranular fracture , and the toughening mechanisms included crack deflection, crack bridging, and crack branching.
研究领域:
材料科学
·
机械工程
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高影响因子
Energy Storage Materials
·
2021
·
IF 17.789
Weibo Huang,Yan Wang,Linze Lv,Wei Wang,Chengchang Jin,Guobin Zhu,Qiang Shi,Qunting Qu,Chao Jin,Honghe Zheng
Fluoroethylene carbonate (FEC) is an important electrolyte additive in silicon (Si) anodes. However, it is easily defluorinated by Lewis acids (PF 5 − ) to form harmful corrosive substances (HF). To overcome this problem, 1-Hydroxyethylidene-1, 1-diphosphonic acid (HEDP), a novel multifunctional surface modifier is developed on the Si surface. It can not only consume HF, but also participate in the formation of a solid electrolyte interphase (SEI) film with excellent electrochemical stability, high lithium conductivity, and good thermal stability. In addition, Si@HEDP anode with polyvinylidene fluoride (PVDF) binder exhibits much improved electrochemical performance. After 500 cycles at 30 °C, a high reversible capacity of 1831.8 mAh g − 1 is obtained; and after 200 cycles at 60 °C, it still maintains 2163.8 mAh g − 1 ; which are in sharp contrast to the reference Si anode of almost zero capacity after 25 cycles. This work overcomes the fundamental challenges of using FEC electrolyte additive and PVDF binder in Si-based batteries.
研究领域:
材料科学
·
电化学
·
电池技术
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Small Structures
·
2022
·Vol. 4
·期 1
·2200161
·
IF 11.343
Lu Chen,Youbing Li,Ke Chen,Xiaojing Bai,Mian Li,Shiyu Du,Zhifang Chai,Qing Huang
Entropy stabilization is an effective method to design and explore MAX phases with outstanding properties via tuning constituent elements and crystal structures, which have received considerable critical attention. Currently, some medium-/high-entropy (ME/HE) MAX phases, whose A layers are composed of Al, S, and magnetic elements, are reported, while few discussions about ME/HE-MAX phases with other A elements (e.g., Sn) are conducted. Herein, fully dense ME/HE-MAX phase bulks ((TiVNb) 2 SnC, (TiVNbZr) 2 SnC, and (TiVNbZrHf) 2 SnC) are designed and synthesized because of the chemical diversity of MAX phases. The results of Rietveld refinement of X-ray diffraction, scanning electron microscopy, and high-resolution scanning transmission electron microscopy-affiliated energy-dispersive spectrometer analysis comprehensively verify the crystal structure of ME/HE-MAX phases. Both the electrical conductivity and the charge carrier mobility are significantly lower than the reported correlation ternary MAX phases, due to the electron scattering and structural defects in ME/HE-MAX phase crystal structures. Similarly, the electron contribution of thermal conductivity is gradually declining; on the contrary, the phonon plays an increasingly dominant role as temperature increases. Owing to the richness in composition of MAX phases, herein, a composition design route for discovering new MAX phases and tuning their properties is indicated.
研究领域:
材料科学
·
凝聚态物理
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qu Ai,Shi-Kuan Sun,Yu Tian,Wei-Dong Xiao,Yi Zhao,Sheng-Heng Tan,Wei-Ming Guo,Hua-Tay Lin
For the sustainable development of nuclear energy, the fabrication of durable nuclear wasteforms, especially for high-level radioactive waste, is essential. This study introduces entropy engineering into zirconolite ceramics for the first time. A series of entropy-stabilized zirconolite ceramics with the general formula Ca( Zr , Hf , Sn ) x Ti 3-x O 7 (x = 0.8–2.2) were synthesized via cold-press sintering at 1450 °C for 10 h. The influence of multi-principal cation substitution on phase assemblage, microstructure, and chemical durability was systematically investigated. The incorporation of Zr, Hf, and Sn led to refined grain sizes, attributed to entropy-induced grain boundary pinning and lattice distortion. At x = 0.8, significant secondary phases including rutile and perovskite were observed. As the substitution level increased, these impurity phases were progressively suppressed, and phase-pure zirconolite was obtained at x = 1.8 and 2.0, as confirmed by XRD, although SEM still revealed trace perovskite. At x = 2.2, the reappearance of perovskite and formation of Hf-enriched zirconolite domains indicated the limit of solid solution stability. Raman and high-resolution TEM confirmed the 2 M zirconolite structure, accompanied by pronounced lattice distortion and stacking faults. Static leaching tests conducted in 1 M HCl revealed that samples with intermediate substitution levels (x = 1.2, 1.6, and 2.0) exhibited significantly improved chemical durability, with calcium release rates of 4.54 × 10 −4 , 2.79 × 10 −4 , and 1.14 × 10 −4 g·m −2 ·d −1 , respectively—an order of magnitude lower than that of conventional zirconolite (1.4 × 10 −3 g·m −2 ·d −1 ). The leaching rates of Zr, Hf, Sn, and Ti remained within the range of 10 −6 –10 −4 g·m −2 ·d −1 across all samples. These results demonstrate that entropy stabilization enhances phase purity, structural stability, and acid resistance, making entropy-stabilized zirconolite a promising matrix material for the immobilization of high-level radioactive waste.
研究领域:
材料科学
·
核工程
·
陶瓷学
·
废物处理
·
固态化学
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jun Cheng,Jun Wang,Xiaozhou Wang,Hao Wang
A novel precursor was synthesized by reacting hafnium chloride with dicyandiamide and dimethylformamide. The precursor was characterized via FT-IR and NMR , as well as TG. Subsequently, the precursor was annealed in Ar over a range of temperatures from 1000 °C to 2000 °C, and the microstructural evolution of the ceramics was investigated by XRD , XPS , and TEM. The results show that the carbothermal reduction of the precursor starts at 1150 °C and the ceramic yields at 1500 °C reach 44.6 wt%. The obtained powders exhibit a uniform distribution and are composed of N-doped HfC and graphite. The N-doped structure postponed the oxidation of the HfC(N) ceramics. The HfC(N) ceramics were first oxidized to yield HfO 2 , carbon, and nitrogen, and then the carbon was oxidized with the evolution of CO 2 . The presented synthesis method is believed to be applicable to the preparation of other high-performance ceramics.
研究领域:
材料科学
·
陶瓷工程
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2026
·
IF 1.7
Liu Xiaotong,Li Hui,Xu Chengjin,Peng Xiujing,Sun Guoxin,Cui Yu,Lu Ping
Efficient separation of nuclear-grade zirconium (Zr) and hafnium (Hf) remains a significant challenge in the nuclear industry. In this study, a novel extractant, di(p-tert-octylphenyl) phosphate (DTOPPA), was designed and synthesized. DTOPPA demonstrated preferential extraction of Hf over Zr in sulfuric acid media, surpassing the performance of conventional extractants such as D2EHPA and PC88A. Under optimized conditions, Hf(IV) extraction achieved 90.7% with a separation factor SF (Hf/Zr) of 13.4. Density functional theory (DFT) calculations and acid–base titration indicated enhanced dissociation of DTOPPA, attributed to the electron-withdrawing phenoxy group, which facilitates cation exchange. Slope analysis, saturation capacity measurements, and Fourier-transform infrared spectroscopy (FTIR) identified the extracted species as Zr(Hf)OA 2 ·2DTOPPA, involving cation exchange and P=O coordination. Selective stripping of Zr was accomplished using dilute sulfuric acid, while oxalic acid efficiently stripped Hf. A two-stage countercurrent extraction process yielded nuclear-grade Zr with stable organic phase recycling. This novel extractant provides an environmentally friendly and efficient method for Zr/Hf separation with significant potential for industrial application.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 9
·e71223
·
IF 4.2
Shenxiang Luo,Xiaopeng Hu,Junyao Wu,Qing Liu,Sai Liu,Jinwei Guo,Fan Zhang,Wang Zhu
A series of A 6 Ta 2 O 17 /8YSZ double-ceramic-layer thermal barrier coatings (TBCs) with varying Hf/Zr molar ratios (1:2, 1:1, and 2:1) are fabricated via atmospheric plasma spraying (APS). The effect of the Hf/Zr ratio on the microstructure, mechanical properties, and high-temperature performance of the coatings under both thermal cycling and thermal shock conditions is systematically investigated. As Hf content increases, the nano-hardness decreases markedly from 16.5 to 12.8 GPa, whereas the intrinsic elastic modulus shows a modest increase from 222.8 to 232.8 GPa. Concurrently, the interfacial fracture toughness decreases from 0.96 to 0.62 MPa·m 1/2 . The equimolar H1Z1 coating (Hf/Zr = 1:1) demonstrates the highest thermal cycling resistance (2371 cycles), a performance attributed to a failure mechanism involving multi-channel stress release at the interfaces. Under thermal shock conditions, the H1Z1 coating also exhibits a prolonged thermal shock lifetime of 2180 cycles. In contrast, the Hf-rich composition (Hf/Zr = 2:1) fails catastrophically after only 682 cycles, due to insufficient erosion resistance, marked by pit formation and progressive thinning. These results highlight the equimolar H1Z1 coating as offering an optimal balance of mechanical compatibility and service durability, making it the most promising candidate among the investigated compositions for advanced TBCs applications.
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高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
·
2023
·
IF 3.9
Pengfei Shi,Ziyong Wu,Yingyan Liu,Guoda Zhang,Chuangli Zhang
Bio-enzymes have the advantages of strong substrate specificity, high catalytic efficiency, and minimal toxic side effects, making them promising drugs in cancer therapy. However, the poor stability and cellular penetrability of uncoated protein in the physiological environment severely restricts the direct application of Bio-enzyme. To address it, we report a metal-organic framework (MOF), Hf-DBA (H 2 DBA, biphenyl carboxylic acid ligands). The morphology of the Hf-DBA was revealed by TEM and the diameter was in the range of 200 to 350 nm. Hf-DBA acted a carrier for intracellular delivery and protection of horseradish peroxidase (HRP). The prepared HRP@Hf-DBA can catalyze the excess H 2 O 2 in the tumor cells to generation of •OH for chemodynamic therapy (CDT). Compared with free HRP, the catalytic activity of HRP@Hf-DBA is significantly improved, and the optimal catalytic conditions are explored. The catalytic stability of HRP@Hf-DBA remained above 70% after 12 cycles of catalysis. After treatment with HRP@Hf-DBA, the apoptosis rates of A549 and Hela cells was 71.64%, and 76.86%. The results in vitro show that HRP@Hf-DBA can effectively inhibit the growth of tumor cells through enhanced CDT.
研究领域:
生物技术
·
癌症治疗
·
纳米材料
·
酶工程
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Beiping Wang,Hao Du,Fenggang Chao,Zhengke Liu,Yaoyao Wang,Zhongli Zou,Jiandong Wu,Chunping Hou
The Hf-doped Li[Ni 0.8- x Hf x Co 0.1 Mn 0.1 ]O 2 ( x = 0–0.04) materials were synthesized by the co-precipitation process combined with high-temperature solid-state reaction. First-principles calculations and Rietveld refinement confirm that Hf doping induces dual-pillar effect by forming more stable HfO 6 octahedrons in the transition metal layers and more NiO 6 octahedrons in the lithium layers, which collectively stabilize the layered structure. Moreover, Hf doping facilitates lithium-ion transport by lowering the diffusion energy barrier and enhances the electronic conductivity of Hf-doped NCMs by reducing the band gap. The 2 mol% Li[Hf 0.02 Ni 0.78 Co 0.1 Mn 0.1 ]O 2 cathode delivers a specific discharge capacity of 205.1 mAh g −1 at 20 mA g −1 and presents an impressive capacity retention of 87.0 % after 100 cycles at 200 mA g −1 at room temperature, with 13.6 % higher than the pristine cathode. At 1 A g −1 charge/discharge current density, the 2 mol% Hf-doped cathode achieves a discharge capacity of 142.4 mAh g −1 . These results further demonstrate the effectiveness of dual-pillar effect in constructing stable layered microstructure, significantly improving cycling stability and high-rate performance.
研究领域:
材料科学
·
电化学
·
储能
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高影响因子
危险品化学品经营许可证（带存储）