JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Hao Liu,Xuan Ge,Qiaodan Hu,Fan Yang,Jianguo Li
La- and Nb-doped BaTi 2 O 5 (BT 2 ) spherical glasses were prepared by a containerless aerodynamic levitation method and their glass-forming regions were established. It is found that La-doping on the Ba-site (network-modifier) and Nb-doping on the Ti-site (network-former) show distinct difference in the glass-forming region: less than 10 % La can replace Ba whereas 40 % Nb can incorporate into BT 2 glass. The distinction in glass-forming ability induced by La- and Nb-doping is discussed mainly from the structural arrangement of the glass. Raman spectroscopy analysis shows that La-doping elongates the short Ti–O bonds in the distorted [TiO 5 ] polyhedra and thus relaxes the network. Nb-doping introduces [NbO 6 ] polyhedra into BT 2 and there exists a critical doping level (20 %), below which incorporation of Nb into BT 2 relaxes the [TiO n ] polyhedra by shortening the long Ti–O bond and above which [NbO 6 ] starts to participate in the network skeleton construction resulting in a dramatic change in the glass structure, which is supported by the dramatic change in the exothermic peak on the DTA curves. This work triggers the speculation that the network-modifiers in BT 2 glass possess a very important role in the structure of network-former skeleton than those in glasses based on traditional network-former oxides such as SiO 2 , GeO 2 and B 2 O 3 , which may provide a useful strategy for modifying the properties of these novel glasses by chemical doping.
研究领域:
材料科学
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玻璃科学
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Qiong Li,Hao Qian,Tianyang Zheng,Xiaoyuan Sun,Yunfei Liu,Yinong Lyu
The cation displacement closely related to the local symmetry and corner-connected oxygen octahedral rotation are the structural origin of macroscopic properties in ABO 3 perovskite oxides. This work describes in detail the relationship between microstructure and macroscopic properties in 0.78BT-0.12CT-0.1BZS ceramic, which achieves the enhanced strain of 0.19 % with a hysteresis of 6.56 %. The atomic level structure is revealed by aberration corrected scanning transmission electron microscope (AC-STEM). The AC-STEM HAADF images reveal the coexisting of polar nanoregions with O and T symmetries. Such a microstructure has a lower energy barrier, facilitating dynamic polarization rotation flexibly under external stimuli. The AC-STEM ABF image reveals the existence of the BO 6 octahedral rotation, with rotation patterns of the a 0 b 0 c 0 and a - b + c - , and rotation angles are quantitatively measured. The BO 6 octahedral rotation and cation displacement are found to be consistent, the greater octahedral rotation with greater cation displacements. These results have important implications for understanding the structural origin of the excellent properties in ferroelectrics .
研究领域:
材料科学
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凝聚态物理
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产品关联
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 6
·968
·
IF 4.329
Yuzhi Xu,Ning Li,Guangbin Wang,Chunpeng Wang,Fuxiang Chu
The conversion of cornstalk lignin derived from the co-product of bio-refinery into value-added products such as polymeric material has remarkable environmental and economic potential. A novel bio-based methyl methacrylate copolymerized with butyl acrylate (MMA-co-BA) hybrid resin in our research was prepared by the reversible addition–fragmentation chain transfer method using lignin-graft-polyacrylamide (lignin-g-PAM) as a bio-derived macromolecular chain transfer agent. The molecular architecture of lignin-g-PAM and the lignin-based MMA-co-BA hybrid resin was elucidated using1H nuclear magnetic resonance and attenuated total reflectance–Fourier transform infrared. The thermal behavior and mechanical performance of the resultant lignin-based MMA-co-BA hybrid resins were also investigated through thermogravimetric analysis, differential scanning calorimetry, and a stress–strain test, respectively. The lignin-based acrylate resins system exhibited structure-related thermal and mechanical properties. Compared with pure MMA-co-BA resin, the incorporation of lignin into various lignin-based MMA-co-BA graft copolymers resulted in an improved tensile strength and a higher Young’s modulus. This research could provide not only a new avenue to utilize waste biomass for high-value applications, but also a reference for designing new materials for coatings or adhesives.Keywords:lignin;macromolecular chain transfer agent;RAFT miniemulsion polymerization;thermal behavior;mechanical performance
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Jingfang Zhou,Pifu Gong,Mingjun Xia,Aimin Ji,Lifang Zhang,Huiqiang Wu,Qian Wu
Replacing alkali metals (K, Na atoms) by an alkaline-earth metal (Ba atom), α-Ba3Sc2(BO3)4 (high-temperature phase) is successfully obtained by a molten salt method, taking Ba2K1.6Na0.4Sc2(BO3)4 as the parent template. Although both of them exhibit similar layered structures composed of ScO6 and BO3 units, α-Ba3Sc2(BO3)4 shows largely distorted ScO6 octahedra (Δd = 0.56) forced by the uniform tension of a larger space effect from BaO12 polyhedrons, rather than regular ScO6 octahedra like in Ba2K1.6Na0.4Sc2(BO3)4. Experimental measurements and calculated analyses elucidate that distorted ScO6 octahedra in α-Ba3Sc2(BO3)4, displaying a second-order Jahn–Teller (SOJT) effect, enlarge the experimental birefringence up to 0.14@550 nm, while Ba2K1.6Na0.4Sc2(BO3)4 with regular ScO6 octahedra only shows Δn = 0.11 under the same condition. In addition, other optical and thermal properties of the two title compounds were characterized. The experimental results indicate that Ba2K1.6Na0.4Sc2(BO3)4 and α-Ba3Sc2(BO3)4 are promising birefringent materials.
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
FuKai Li,Min Wang,Jian Zhou,MengRui Yang,TongTong Wang
A novel magnetically and efficiently multifunctional boronic acid (BA) -functionalized core-shell nanohybrid (Fe 3 O 4 @SiO 2 @BA) was prepared for capture and separation of cis -diol-flavonoids. The morphology and physicochemical properties of resultant nanoparticles were systematically characterized via several techniques, and the results confirmed that the target nanohybrids were successfully functionalized and modified. Meanwhile, two flavonoids (quercetin and luteolin) were selected to investigate the selective capture of the Fe 3 O 4 @SiO 2 @BA in procedure of magnetic solid phase extraction (MSPE). The main parameters influencing the adsorption and elution conditions were systematically investigated and optimized. Furthermore, the adsorption kinetic models were adopted to elucidate the adsorption process , indicating that the pseudo-second-order model was suitable to explain the adsorption kinetics. Under the optimum conditions, the MSPE-HPLC-MS/MS approach was established with a wide linear dynamic range and good linearity (R 2 > 0.999), low limits of detection (0.0096–0.033 μg L −1 ) and satisfactory recoveries (91–107.6%). The proposed analytical method was successfully applicated by determining the content of target flavonoids in food samples (apple and onion). Accordingly, the prepared nanohybrid could serve as an efficient, rapid and economical potential adsorbent for extracting cis -diol-flavonoids in complex food samples.
研究领域:
纳米技术
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分析化学
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食品科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xinyu Liu,Taotao Ai,Xinyu Chen,Qin Li,Qian Qiu,Ying Zheng,Yuan Zhou,Haikui Song,Kun Yu,Chunlin Song,Haibo Zhang,Gang Liu,Yan Yan
In recent years, lead-free Bi 0.5 Na 0.5 TiO 3 (BNT) based piezoelectric ceramics with excellent strain properties have gained widespread recognition for their application in high-precision displacement actuators. The (1- x )(0.82Bi 0.5 Na 0.5 TiO 3 -0.18K 0.5 Bi 0.5 TiO 3 )- x Ba(Fe 0.5 Sb 0.5 )O 3 ceramics were fabricated through the die-pressing method in this work. The effect of BFS introduction on the dielectric, ferroelectric and microstructure characteristics of BNKT ceramics was systematically investigated. Among these compositions, the BNKT-0.015BFS ceramics exhibited a piezoelectric strain coefficient ( d 33 *) of 658 pm/V at an electric field of 55 kV/cm, while achieving a strain response of 0.51 % at 85 kV/cm. The observed improvement in strain performance can be attributed to the evolution from non-ergodic relaxor state to ergodic relaxor state caused by BFS substitution. Furthermore, transmission electron microscopy (TEM) explicitly confirmed coexistence of rhombohedral and tetragonal phase and revealed the morphology of nanosized domains. This study adds to a deeper comprehension of the characteristics of strain response enhancement in BNT-based ceramics, opening up avenues for designing novel lead-free piezoelectric ceramics with outstanding electromechanical performance.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Zhiwei Li,Zhengxiang Bian,Yurong Ren,Zhihui Chen,Jiujun Xu
(1-x)(0.9Ba 1.003 Ti 0.97 Ca 0.03 O 3 –0.1(Bi 0.51 Na 0.47 ) 0.94 Ba 0.06 TiO 3 )-xNa(Nb 0.85 Ta 0.15 )O 3 ( x = 0.03–0.15) ceramics were designed and fabricated through a bidirectional optimization strategy using traditional solid reaction method. The results revealed that the introduction of Na(Nb 0.85 Ta 0.15 )O 3 increased the vacancy concentration at the A site , conducing to improved polarization and reduced grain size. The substitution at the B site disrupted the long-range ordered ferroelectric domains and generated polar nanodomains, leading to enhanced relaxation behavior. The optimum energy storage density of 3.57 J/cm 3 and efficiency of 87.5% were simultaneously achieved under the electric field of 220 kV/cm in the sample with x = 0.09. Moreover, it also exhibits extremely high-power density (∼57 MW/cm 3 ), ultrafast discharge time (∼103 ns), high discharge density (1.35 J/cm 3 ), along with excellent temperature (30‒120 °C) and frequency stability (1‒100 Hz) under the equivalent electric field of 120 kV/cm. This novel design strategy provides theoretical guidance for the development of advanced electrical energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2026
·
IF 7.3
Min Zhu,Xiaonan Chen,Danan Ma,Zhiping Wan,Hongyu Cao,Jiacheng Cao,Peiqing La
Oxide materials are promising for thermoelectric applications due to their high thermal and chemical stability at elevated temperatures. However, their efficiency is often limited by low electrical conductivity and high thermal conductivity, stemming from simpler structures compared to complex intermetallic compounds. In this study, two novel high-entropy strontium barium niobate oxides, (Sr 0.17 Ba 0.17 La 0.17 Eu 0.17 K 0.17 Na 0.17 )Nb 2 O 6-δ and (Sr 0.17 Ba 0.17 La 0.17 Eu 0.17 K 0.17 Pb 0.17 )Nb 2 O 6-δ , were designed using high-entropy engineering. XRD confirmed the formation of a tungsten bronze structure, while SEM and EDS showed dense microstructures and uniform elemental distribution. The materials exhibit low thermal conductivity—below 1.8 W·m -1 ·K -1 from 323 to 1073 K—indicating strong thermal insulation. At 923 K, (Sr 0.17 Ba 0.17 La 0.17 Eu 0.17 K 0.17 Na 0.17 )Nb 2 O 6-δ achieves a peak power factor of 349.30 μW·m -1 ·K -2 , leading to a ZT of 0.22 at 1073 K. This improvement results from enhanced electron transport and phonon scattering enabled by high-entropy design.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lingxi Lei,Lei Li,Jielei Tu,Delin Xu,Zhican Ba,Jian Yu,Shengyao Huang,Hong Luo,Jiahui Hou,Lingfu Kong,Xibo Du,Jiancheng Cui
The rare-earth down-shifting (Sr,Ba) 2 SiO 4 :Eu 2+ (SBSE) material can convert ultraviolet light into visible light, reduce the damage caused by ultraviolet light to solar cells, and improve the efficiency of solar cells. In this study, by mixing the rare-earth down-shifting (Sr,Ba) 2 SiO 4 :Eu 2+ material with ethylene vinyl acetate and encapsulating solar cells, the competitive relationship between light conversion and scattering by rare-earth down-shifting materials in ethylene vinyl acetate and its effect on solar cell power were revealed. And its reliability was verified through experiments. The experimental results showed that the dominant factor influencing the optical properties of ethylene vinyl acetate changes with SBSE concentration. At concentrations of 0.25–0.5 wt%, the scattering of light by SBSE is dominant. At concentrations of 0.5–1 wt%, the down-shifting conversion of light by SBSE is dominant. When the concentration of SBSE increases to 1.5 wt% concentration, SBSE agglomerates, and the scattering of light by SBSE is dominant once again. Photovoltaic modules were fabricated for external quantum efficiency (EQE) and electrical property tests. The photovoltaic module EQE was affected by the changes in the optical properties of the SBSE-EVA. The performance of the photovoltaic modules prepared using SBSE materials first worsened, then improved, and then worsened again with increasing SBSE concentration. Among the tested conditions, 1 wt% was the best SBSE concentration, resulting in an EQE improvement of 2.916 %. The maximum power, short-circuit current, open-circuit voltage, and fill factor of the SBSE module increased by 1.82 %, 2.044 %, 1.791 %, and 0.069 %, respectively.
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产品关联
DOI
高影响因子
Optoelectronics Letters
·
2014
·Vol. 10
·期 5
·343-346
·
IF 0
Song Jun,Sun Liang,Li Jian,Ma Jian,Wang Da-jian
A solid-solution-phase Ba 1.75 Ca 1.25 MgSi 2 O 8 : Eu 2+ , Mn 2+ phosphor in the photosynthetic action spectrum with dual band emissions at 438 nm and 660 nm is fabricated. X-ray diffraction (XRD) confirms the presence of the solid-solution phase. With the supporting information from the diffuse reflection spectrum, a feasible way to obtain higher energy-transfer (ET) efficiency is attained, and the ET efficiency of Eu 2+ -Mn 2+ is enhanced to 76%. The mechanism of this enhancement is owing to variation of the solid solution composition of Ca 3 MgSi 2 O 8 and Ba 3 MgSi 2 O 8 , which contributes to the extension of the critical distance. Temperature-dependent results show an enhancement which is attributed to Ca. These enhancements show great promise for improving eco-lighting devices.
研究领域:
材料科学
·
光电子学
·
无机化学
·
功能材料
·
农业光生物学
✓ 已验证
DOI
Materials Advances
·
2022
·Vol. 3
·期 15
·6171-6178
·
IF 0
Mingsheng Cai,Tianchun Lang,Tao Han,Damir Valiev,Shuangqiang Fang,Houjiang You,Bitao Liu,Ling Du,Zichao Xu,Elena F. Polisadova
Investigating narrow-band green emitting phosphors with high efficiency and good thermal stability is the main goal of the present light-emitting diode (LED) display research. Here, Ba1−xCaxScO2F:0.001Bi3+,0.001K+ (x = 0–0.12) perovskite phosphors, emitting narrow green light excited by a 415 nm chip, were developed using the cation substitution design strategy. The effects of Ca2+ substitution for Ba2+ in the Ba1−xCaxScO2F:0.001Bi3+,0.001K+ crystal structures and photoluminescence properties were investigated. All the phosphors show the cubic perovskite-type structure in the space group Pm3m. The evolution of the cell parameters and the Ba/Ca/K/Bi–O bond lengths were evaluated. The phosphors with the internal quantum efficiency of 77.4% exhibit bright green emission peaking at 510 nm under 415 nm chip excitation. The improvement of luminescence efficiency and thermal stability was discussed in detail in relation to the local structure variation. The cation substitution design strategy mentioned here can become an important approach to realize the spectral modulation through controlling the micro-environment in the lattice for excellent LED backlight displays.
研究领域:
材料科学
·
光学工程
·
无机化学
·
固体物理
·
显示技术
✓ 已验证
DOI
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 20
·7839-7845
·
IF 3.069
Kun Chai,Shichao Cheng,Hongyi Li,Bin Dai
A new phosphate fluoride, Rb2CaPO4F, was synthesized from a high temperature solution. Single-crystal X-ray diffraction analysis indicates that Rb2CaPO4F belongs to the Pnma space group of the orthorhombic system. It exhibits an intricate three dimensional (3D) framework that consists of 1D infinite zig-zag [FRb2Ca]∞ chains interlinked by isolated PO4 tetrahedra. The 1D chains are composed of plane-sharing F-centered [FRb4Ca2] octahedra. Meanwhile, we also obtained another phosphate fluoride K2CaPO4F, which is isostructural with Rb2CaPO4F. Moreover, the effect of the cation size on the framework structures of A2CaPO4F (A = K, Rb) and K2BaPO4F is discussed in detail. In addition, the UV-Vis-NIR diffuse reflectance spectra and the infrared spectra were measured to determine their cut-off edge and the anionic group, respectively. The first-principles theoretical studies were also conducted to aid in the understanding of the electronic structures and linear optical properties.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）