Materials Advances
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2024
·Vol. 5
·期 7
·3022-3028
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IF 5.2
Lu Han,Chao Liu,Xiaoli Wang,Feiyu Li,Chuanyan Fan,Junjie Zhang
α-TeO2 is widely used in acousto-optic devices due to its excellent physical properties. Conventionally, α-TeO2 single crystals were grown using melt methods. Here, we report for the first time the growth of α-TeO2 single crystals using an aqueous solution method below 100 °C. The solubility curve of α-TeO2 was measured, and then single crystals with dimensions of 3.5 × 3.5 × 2.5 mm3 were successfully grown using seed crystals that were synthesized from spontaneous nucleation. The as-grown single crystals belong to the P41212 space group, evidenced by single crystal X-ray diffraction and Rietveld refinement on powder diffraction. Rocking curve measurements show that the as-grown crystals exhibit high crystallinity with a full-width at half maximum (FWHM) of 57.2′′. Ultraviolet-visible absorption spectroscopy indicates that the absorption edge is 336 nm and the band gap is estimated to be 3.69 eV. The density and Vickers hardness of the as-grown single crystals are measured to be 6.042 g cm−3 and 404 kg mm−2, respectively. Our findings provide an easy-to-access and energy-saving method for growing single crystals of inorganic compounds.
研究领域:
材料科学
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晶体生长
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声光器件
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无机合成
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光学性能
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 29
·1899
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IF 2.8
Chen Yuan-Bin,Tang Ruxuan
With the robust advancement of fifth-generation (5G) wireless communication and the steady progression of sixth-generation (6G) wireless communication toward practical implementation, the communication sector has imposed unprecedented requirements on microwave dielectric ceramics, particularly concerning their crucial performance parameters, including a suitable dielectric constant, ultra-low dielectric loss, and a near-zero temperature coefficient of resonant frequency. CoMo 1- x Te x O 4 ( x = 0.01, 0.03, 0.05, 0.07) ceramics were successfully synthesized via the conventional solid-state reaction method. The mixed powders underwent pre-calcination at 500 °C, and the samples were subsequently sintered for 4 h within the temperature range of 550 °C to 650 °C. The results of X-ray diffraction (XRD) analysis and Rietveld refinement reveal that when x ≤ 0.03, the obtained samples are monoclinic ceramic crystals belonging to the C 2/ m space group. When the Te 6+ content x ≥ 0.05, a monoclinic crystal structure with the P 2/ c space group emerges. Moreover, at x = 0.07, the quality factor of the sintered ceramic samples reaches its maximum value at 600 °C. According to scanning electron microscopy (SEM) analysis, the relative density has a significant impact on the dielectric constant and quality factor of the ceramics. Raman spectroscopy was utilized to probe the internal lattice vibration modes. The results demonstrate that the dielectric constant ( εᵣ ) of the ceramics exhibits a close correlation with the Raman spectral shifts, while the quality factor ( Q × f ) is strongly associated with the full—width at half-maximum (FWHM) of the Raman peaks. At 600 °C, the CoMo 1- x Te x O 4 ceramics exhibit excellent dielectric properties: a dielectric constant ε r = 9.13 (± 0.06), a quality factor Q × f = 84,224 (± 2301) GHz, and a temperature coefficient of resonant frequency τ f = -72.8 (± 1.3) ppm/°C. The ionic polarizability and relative density are the primary determinants of ε r . The Q × f is influenced by the packing density and relative density. Based on the P–V–L theory, the Mo–O bonds make a significant contribution to the quality factor ( Q × f ) and the temperature coefficient of resonant frequency ( τ f ). Notably, at 600 °C, the ceramics still maintain an appropriate dielectric constant ( ε r ) and high-performance Q × f values. This research holds an indispensable role in the development of ultra-low temperature co—fired ceramics (ULTCC).
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COMPOSITES COMMUNICATIONS
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2026
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IF 8.6
Xiuwen Gao,Jinhui Tan,Chong Lin,Gao Pan,Huixing Li,Fangwei Qi,Xin Li,Shuping Peng,Cijun Shuai
Photo-thermoelectric-driven vanadium valence cycling enhanced ROS generation. • NIR-triggered electrical stimulation activated calcium signaling for osteogenesis. • Synergistic antitumor and antibacterial efficacy was achieved through self-enhanced chemodynamic and thermoelectric catalysis therapy. • A multifunctional scaffold achieved tumor/bacteria elimination and bone repair. The peroxidase-like activity of vanadium carbide MXene (V 2 C) nanozyme drove the valence transition from V 3+ to V 4+ , and catalyzed hydrogen peroxide to generate reactive oxygen species (ROS) for eliminating tumor and bacteria, exhibiting potential in post-resection osteosarcoma therapy. However, V 4+ could not spontaneously reduce to V 3+ , interrupting the generation of ROS. To address this, a scaffold strategy based on photo-thermoelectric driven valence cycle was proposed. Specifically, Bi 2 Te 3 @V 2 C heterojunction was constructed via electrostatic self-assembly and then incorporated into poly(L-lactic acid) scaffold using additive manufacturing technology. X-ray photoelectron spectroscopy results demonstrated that under near-infrared light irradiation, photo-thermoelectric bismuth telluride (Bi 2 Te 3 ) generated electrons via the Seebeck effect, which efficiently reduced V 4+ to V 3+ , thereby achieving vanadium ion valence cycling and enhancing ROS production. Simultaneously, the photothermal effect of Bi 2 Te 3 enhanced peroxidase-like reaction efficiency. Furthermore, Bi 2 Te 3 triggered redox reactions through thermoelectric catalysis properties, thereby elevating ROS production levels and further enhancing antitumor and antibacterial efficacy. The scaffold-generated ROS induced mitochondrial dysfunction and apoptosis in tumor cells, while also causing the leakage of bacterial intracellular substances to reduce implant-related infection risks. The experimental results showed that both its antitumor and antibacterial rates exceeded 95%. Moreover, the scaffold delivered non-invasive electrical stimulation through photo-thermoelectric conversion, which activated calcium signaling pathways to promote bone repair. This study provided a multifunctional scaffold with antitumor, antibacterial and osteogenic capabilities.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2026
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IF 6.6
Yutong Song,Zhen Guo,Shunli Yu,Jinbo Bai,Miaojing Li,Xinyu Cui,Shenghua Ma
Laser-enhanced contact optimization (LECO) is an important technology for making high-efficiency n-type TOPCon solar cells. In this study, we tested six different Te/Pb molar ratios (0–0.5) to determine how the glass microstructure, thermal properties, and cell performance are related. Using Raman, XPS, and DSC analyses, we found that the glass structure changes in stages, depending on the arrangement of Te atoms. At lower Te/Pb ratios, Te mostly forms asymmetric [TeO 3 ] units. The lone-pair electrons in these units create more space in the glass network, reaching the highest level of network breakdown at a ratio of 0.25. When the ratio increases, the network becomes denser as more [TeO 4 ] units form. This change affects the glass's thermal properties, with the 0.25 ratio showing the lowest glass transition temperature and a wider sintering window. High-temperature microscopy shows that these features help the glass evenly wet the SiN x /AlO x passivation stack. We also examined how altering the Te/Pb ratio affects the structure and high-temperature wetting of LECO-specific Pb-B-Si glass frits. The improved flow of the glass helps form a continuous layer at the interface, which supports the growth of dense silver crystals and many current-fired contacts (CFCs). As a result, the frit with a 0.25 Te/Pb ratio gives a 0.21% boost in efficiency and lowers series resistance by 0.23 mΩ. However, too much Te causes problems such as junction shunting and over-etching, indicating a critical processing range. This study explains how microstructure affects frit performance and offers a precise approach to improving photovoltaic metallization.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Hengji He,Dainan Zhang,Youbin Zheng,Shuyang Ma,Cheng Liu,Qinghui Yang,Huaiwu Zhang
Li/Te co-doped CaWO 4 ceramics with Li:Te molar ratios of 1:0.5, 1:0.75 and 1:1 was prepared to examine composition- and processing-dependent structural evolution and microwave dielectric properties. The Li:Te = 1:1 series was optimized at 890 °C, whereas the Li:Te = 1:0.5 and 1:0.75 series were optimized at 910 °C. XRD and Rietveld refinement, Raman spectroscopy, EPR, XPS, GCIB depth-profile XPS, ICP-OES and electron microscopy were used to correlate phase assemblage, local bonding, chemical-state signals, retained Li, microstructure and dielectric response. Under the respective optimized conditions, the Li:Te = 1:0.75, x = 0.04 ceramic exhibited the highest Q× f value of 89,613 GHz, while the Li:Te = 1:1, x = 0.04 ceramic showed the least negative τf value of −32.06 ppm/°C. GCIB depth-profile XPS revealed composition-dependent depth evolution of the relative Te 4 + - and Te 6+ -related signals, and ICP-OES confirmed systematic differences in total retained Li. In the Li:Te = 1:1 series, electron microscopy identified a Te/O-enriched amorphous interfacial region. Together, these results show that the Li:Te ratio and sintering condition jointly influence local structure, densification behaviour and microwave dielectric properties. The work provides a basis for optimizing the balance between low dielectric loss and temperature stability in CaWO 4 -based ceramics. Furthermore, a preliminary Ag co-firing test further indicates chemical compatibility under the tested condition.
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JOURNAL OF CRYSTAL GROWTH
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2026
·
IF 2.5
Ziyue Chen,Jie Chen,Zhaoyi Li,Shu Guo,Rukang Li
A new neodymium-niobium-tellurite compound, NdNbTe 2 O 8 , was successfully obtained through high-temperature solution method. NdNbTe 2 O 8 crystallized in the centrosymmetric space group P 2 1 / c with unit cell parameters of a = 5.6146(6) Å, b = 21.936(2) Å, c = 8.0905(6) Å, β = 136.09°, and Z = 4. Its structure is composed of two alternately arranged layers consisting of NbO 6 octahedra and NdO 8 polyhedra, with TeO 3 trigonal pyramids linked the layers to form a 3-dimensional framework. This particular structural feature has been discovered in a series of recent found new compounds with similar compositions of RMQ 2 O 8 (R = Y, La, Nd; M = V, Nb; Q=Se, Te) including the noncentrosymmetric LaNbTe 2 O 8 with favorable nonlinear optical properties. The structural evolution, crystal growth, thermal analysis and optical spectrum of the title compound are also presented.
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Nanoscale
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2026
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IF 5.2
Zemin Zheng,Siyuan Li,Jiuxiang Dai,Ang Li,Xingxing Zhang,Mo Cheng,Zhitong Jin,Lin Zhou
Anisotropic two-dimensional (2D) materials with low structural symmetry and in-plane optical anisotropy provide a promising platform for the development of polarization-driven photonic devices. Herein, high-quality subcentimetre-scale InTeO3Cl single crystals were prepared using the chemical vapor transport (CVT) method and further exfoliated to flakes of nanometer thickness. The crystal structure, optical anisotropy, bandgap, and stability of 2D InTeO3Cl were extensively investigated. Raman characterization verified the strong in-plane optical anisotropy of 2D InTeO3Cl. Furthermore, it presented an optical bandgap of 2.6 eV and excellent environmental and thermal stability. Interestingly, 2D InTeO3Cl manifested an anisotropic second-harmonic generation (SHG) response, which originated from a centrosymmetry breaking induced by periodic interlayer dislocation. Our work reveals the outstanding in-plane optical anisotropy and nonlinear optical effects of 2D InTeO3Cl and provides a promising candidate for the development of high-performance optical and photonic devices.
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PubMed
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ACS ES&T Water
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2026
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IF 4.3
Zhiguang Liu,Hongyuan Chen,Xiaofang Zheng,Yue Lv,Fangqin Cheng,Yujing Guo
Mercury ion (Hg2+) is a highly toxic environmental pollutant distributed widely in water, posing a substantial threat to human health. Thus, developing a sensitive and handy tool for Hg2+ onsite detection will be greatly beneficial for the prevention and control of Hg2+ pollution. Herein, CoTe2 was synthesized successfully as a novel mimic peroxidase. The peroxidase-like activity of CoTe2 was significantly enhanced by Hg2+ due to the strong combination of Te–Hg, causing improved generation of ·OH and activated oxidation of the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine. From this, a colorimetric and electrochemical dual-mode sensor was developed for the detection of Hg2+, which presented wide linear ranges of 0.050–10.0 and 0.010–15.0 μM, with low detection limits of 16.7 and 3.3 nM, respectively. Additionally, the sensor is more conducive to Hg2+ detection in the environmental water samples with complex compositions due to its remarkable anti-interference ability originating from the specific binding of Te–Hg. Furthermore, a smartphone was utilized as a portable tool to achieve rapid onsite detection of Hg2+. Consequently, the proposed sensor has outstanding advantages of high sensitivity, good selectivity, and high practicality, showing considerable potential for the broad application of environmental water sample detection.
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ADVANCED FUNCTIONAL MATERIALS
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2026
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IF 19.9
Wei Tian,Hairui Zhang,Xinyi Qian,Zhenyu Ji,Fei Wang,Zhentao Du,Xue Zhao,Bingsuo Zou,Hui Peng
Combining information from different images for multispectral image fusion can enhance human or machine perception. Nowadays, various luminescent materials with different spectral responses are used for image fusion, but this requires complex algorithms and systems to address pixel and position mismatches. Using a single luminescent material to obtain multispectral imaging can effectively avoid pixel mismatch and complex imaging processing. Herein, we report efficient blue-light-excitable ultrabroadband white emission and near-infrared (NIR) emission in the Te 4+ /Mo 4+ -codoped Cs 2 ZrCl 6 with a luminous efficiency of 94.2% (NIR region: 52.6%). Moreover, this compound also shows bright radioluminescence with a light yield of 55 000 photons/MeV in the visible light region. Benefiting from these fascinating optical properties, high-performance single-component white light-emitting diode (WLED), NIR LED, and X-ray scintillator were fabricated based on Te 4+ /Mo 4+ -codoped Cs 2 ZrCl 6 /polydimethylsiloxane flexible film. Particularly, we took bullfrog palm as the target object, and demonstrated its applications in white light imaging, NIR imaging, and X-ray imaging, respectively. Without pixel mismatch and complicated imaging processing, the pixel-level X-ray to NIR image fusion was realized, which can not only observe the wound of bullfrog palm, but also clearly obtain the structure and distribution of blood vessels and skeleton textures under the skin tissue of bullfrog palm.
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DALTON TRANSACTIONS
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2026
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IF 3.3
Jingfang Zhou,Pifu Gong,Chang Gao,Mingjun Xia,Jing Yu,Hongxia Zhang,Qian Wu
In Li3GaTe4O11, asymmetric TeOn (n = 3, 4) polyhedra and GaO6 octahedra construct a three-dimensional (3D) tunnel framework, with Li+ cations occupying the sixteen-membered channels. High framework density (12.1) and small void space (3.75%) of Li3GaTe4O11 collectively demonstrate that Li+ cations are spatially confined within the tunnels by the dense, compact framework. This confinement amplifies their steric influence, thereby enabling effective regulation of TeOn (n = 3, 4) with large local dipole moments. The real-space projections of the valence band maximum (VBM) and conduction band minimum (CBM) also reveal that small interstitial Li+ cations can act as "structural mediators" to tune the arrangement of TeOn (n = 3, 4) units, thereby influencing the framework of Li3GaTe4O11. This work opens a new avenue for exploring non-centrosymmetric (NCS) materials through resident cation engineering.
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PubMed
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OPTICS AND LASER TECHNOLOGY
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2026
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IF 5.2
Xiangyan Yun,Xueping Zang,Haizhe Zhong,Denghui Xu
Optical thermometry based on rare-earth-activated phosphors has attracted increasing interest for non-contact temperature sensing applications. Herein, a Sm 3+ -activated BaLaLiTeO 6 (BLLT:Sm 3+ ) phosphor is developed and systematically investigated as a multimode optical thermometric material. Benefiting from the thermally coupled 4 G 5/2 → 6 H J transitions of Sm 3+ ions, multiple fluorescence intensity ratio (FIR) thermometric modes are established, all exhibiting high fitting reliability and favorable sensitivities. Notably, a maximum relative sensitivity ( S R ) of 3.14% K −1 is achieved, demonstrating the effectiveness and flexibility of the multimode thermometric strategy. The optimal Sm 3+ concentration is determined to be 4 mol%, with concentration quenching governed by electric dipole–dipole interaction. In addition to its excellent thermometric performance, the phosphor exhibits intense orange-red emission with a high photoluminescence quantum yield (PLQY) of 39.02%, providing strong emission signals that are advantageous for reliable optical temperature sensing. These results highlight BLLT:Sm 3+ as a promising thermally robust phosphor for advanced optical temperature sensing.
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CERAMICS INTERNATIONAL
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2026
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IF 6
Qianjin Wang,Zhiyuan Yin,Xinghui Li,Huina Tang,Wei Liu
Accurate thermal monitoring in complex environments is often hindered by various interferences. This study presents a miniaturized, robust fiber-optic temperature sensor based on green up-conversion fluorescence from erbium/ytterbium co-doped tellurite glass. Fabricated through a feasible fiber drawing and adhesive bonding approach, the sensor operates on the fluorescence intensity ratio FIR technique, exhibiting a reproducible response from −19.2 to 80.4 °C with a sensitivity of 8.34 × 10 −3 K −1 at 310 K and a 4 s response time. The sensor's reliability has been verified through real-time monitoring of human skin temperature and electronic chip thermal management. Furthermore, its ability to track photothermal effects highlights its potential as a miniature temperature feedback component in high-power UV systems. This work establishes a versatile and practical sensing solution for demanding thermal monitoring applications.
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