MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Zhiyong Mao,Jingjing Chen,Liang Sun,Qifei Lu,Dajian Wang
(Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphors with 430/505/660 nm tri-bands or 430/660 nm dual-bands emission were demonstrated in this work by controlling the appearence or not of green emitting intermediate phases, (Ba,Sr) 2 SiO 4 :Eu 2+ . Through varying the stoichiometric amount of SiO 2 in precursor, the coexistence of green emitting intermediate phase tended to be sensitive and diversified. Laser Microzone Raman spectrum was employed to look insight into the lattice stretch and the preferential occupation sites of Ba 2+ ions in Sr 3 MgSi 2 O 8 lattices. The local structure and the crystal field of Eu 2+ luminescent centers were found to be disturbed by distorted arrangement of cross-linked [MgO 6 ] octahedra and [SiO 4 ] tetrahedra. This mechanism approach provided some new insights to further understanding the adjustment strategy of green emitting intermediate phases in (Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphor potentially applied as red/blue dual-bands emitting or red/green/blue tri-bands emitting materials.
研究领域:
材料科学
·
无机化学
·
发光材料
·
固体物理
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 5
·050534
·
IF 3.1
Yi Zou,Yaozhong Chen,Tao Jiang,Songxue Shao,Mingjing Xiao,Yuetong Lv,Yuting Wang,Lvjin Gao,Li Chen,Wentao Zhao
It is popular to choose the cubic phase Li7La3Zr2O12(c-LLZO) to synthesize the PEO-based complex membrane in all-solid-state battery. In this work, Ba/Nb elements were selected to achieve Li6.75La3Zr1.75Nb0.25O12 (LLZNO) and Li7La2.75Ba0.25Zr1.75Nb0.25O12 (LLBZNO) with high ion conductivity, which effectively enhance the electrochemical properties of the complex solid membrane and the all-solid-state battery. The higher ion mobility of LLBZNO compared to that of LLZNO and LLZO is calculated by ab-initio molecular dynamics (AIMD) simulation and further confirmed by experiments. Results show that the cubic phase of LLBZNO is more stable than that of LLZNO. The complex membrane of LLBZNO@ polyethylene oxide (PEO) (CPE-2-x wt%) exhibits the better electrochemical properties than LLZNO@PEO (CPE-1-x wt%) complex membrane. In detail, the CPE-2–10 wt% has the outstanding lithium transfer number ({t}_{{{Li}}^{+}}) of 0.63, as well as the excellent compatibility with lithium metal anode. In addition, at 0.1 mAcm−2, the lithium/CPE-2–10 wt%/lithium symmetric cell remains stable after 1000 h. It is LLBZNO that makes LLBZNO@PEO composite polymer electrolyte(CPE) the potential for the application in all-solid-state lithium battery.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Micro & Nano Letters
·
2022
·Vol. 17
·期 4
·77-85
·
IF 0.98
Jia-Shu Tu,Shao-Wen Zhang,Hong-An Ying,Wei-Wen Hong,Dan Chen
Presented is a new heterometallic compound, namely [Cd 2 Ba 2 (pdc) 4 (H 2 O) 4 (DMA) 2 ]} n · n (H 2 O) ( 1 , H 2 pdc = terephthalic acid, DMA is N , N ′-dimethylacetamide), which was created with the solvothermal reaction. The architectural analysis of X-ray indicated that the 1 reveals a three-dimensional skeleton according to one-dimensional infinite chains. After removal of the free along with coordinated solvent molecules, it contains 49.8% solvent-accessible volume and unsaturated coordination sites. The solvent-free form of 1 exhibits excellent catalytic effect for the addition reaction between diethylzinc and benzaldehyde. Its therapeutic effect and mechanism exploration on diabetes was conducted in this present research. Firstly, the abundance of intestinal flora in the gut was detected with real time RT-PCR assay. Besides, the measurement of the levels of sugar was conducted with blood glucose meter in the T2DM animal after compound treatment. The cytotoxicity of the 1 was evaluated with CCK-8 assay.
研究领域:
化学
·
医学
·
材料科学
✓ 已验证
DOI
高影响因子
Pigment & Resin Technology
·
2024
·
IF 1.3
Zhichuang Qi,Jingshan Chen,Zhangmi Huang,Chunyan Hu,Baojiang Liu
PurposeThis paper aims to prepare Poly(Styrene-Butyl acrylate-Methacrylic acid) @Poly Gallic acid-Fe3+photonic crystal composite inks [P(St-BA-MAA)@PGA-Fe3+PCCI, @ means the PGA-Fe3+is loaded on the microspheres] and construct noniridescent structural colors on fabric substrates, with the goal of improving the visibility of structural colors.Design/methodology/approachP(St-BA-MAA)@PGA-Fe3+PCCI were prepared by coating P(St-BA-MAA) microspheres with a metal-polyphenol network formed by gallic acid (GA, C7H6O5) and Fe3+. The assembly effects of the inks were explored under different conditions, including pH, temperature, concentration and surface tension. The optimal self-assembly conditions of the inks were determined using the controlled variable method.FindingsThe results demonstrated the successful preparation of P(St-BA-MAA)@PGA-Fe3+PCCI. The metal polyphenol network film composed of GA and Fe3+was successfully coated on the surface of P(St-BA-MAA) seed microspheres. The assembly mechanism of the inks was investigated, indicating that at a diethylene glycol (DEG, C4H10O3) concentration of 0.3 wt% and pH of 7, bright noniridescent structural colors could be formed on fabric surfaces after self-assembly by PCCI at 60 °C for 10 min. Furthermore, the mechanical fastness of the structural colors was enhanced due to the adherence of the soft shell composed of P(St-BA-MAA) and GA.Originality/valueUtilizing a cost-effective approach and a diverse array of readily available raw materials, we have successfully prepared P(St-BA-MAA)@PGA-Fe3+PCCI, which boasts superior performance and offers fabrics a range of unique coloring styles. This innovation paves the way for potential applications of structural colors in practical production, thereby broadening their realm of utility.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jian Zhang,Penghui Yao,Xuanlin Lu,Jiaxuan Chen,Wen Liu,Yicheng Zhao,Yongdan Li
The sluggish oxygen reduction reaction (ORR) at the cathode is a key step in protonic ceramic fuel cells. In this work, Pr 1.7 Sr 0.3 Ni 0.7 Cu 0.3 O 4+δ cathode with a Ruddlesden-Popper (RP) structure is modified with the doping of Ba, and BaPrO 3-δ nanoparticles are formed on the surface of the cathode. The addition of Ba improves the oxygen vacancy concentration and the electrical conductivity of the cathode, and the cathode with the nominal composition of Pr 1.7 Ba 0.15 Sr 0.3 Ni 0.7 Cu 0.3 O 4+δ shows the highest activity for the ORR process. The cathode shows the lowest polarization resistance of 0.055 Ω cm 2 at 700 °C. The hydration ability of the cathode is also enhanced with Ba. The maximum power density of a protonic ceramic fuel cell with Pr 1.7 Sr 0.3 Ni 0.7 Cu 0.3 O 4+δ cathode increases from 877 to 1262 mW cm −2 at 700 °C after the doping of Ba in the cathode. The cell also shows a promising durability.
研究领域:
材料科学
·
能源工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6666
·
IF 3.623
Xingru Zhang,Yinan Xiao,Beining Du,Yueming Li,Yuandong Wu,Liyuan Sheng,Wenchang Tan
The characteristic transition from ferroelectric (FE) to ergodic relaxor (ER) state in (Bi0.5Na0.5)TiO3(BNT) based lead-free ceramics provides an efficient approach to bring a highly ordered phase back to a disordered one. It would be rational to utilize this transition to improve relevant non-piezoelectric properties based on domain decomposition. In this work, different La contents were introduced to 0.93(Bi0.5Na0.5)TiO3-0.07Ba(Ti0.945Zr0.055)O3ceramics (BNT-BZT-xLa) to induce evolution of ergodic degree. The results reveal that with increasing La content, both the FE-ER transition temperatureTF-Rand depolarization temperatureTdshift towards room temperature, implying a deepened ergodic degree. By modulation of ergodic degree, thermally stimulated depolarization current experiment shows a higher current density peak, and corresponding pyroelectric coefficient increases from 2.46 to 2.81 μC/(cm2∙°C) atTd. For refrigeration, the indirect measurement demonstrates the ΔTmaximum increases from 1.1 K to 1.4 K, indicating an enhanced electrocaloric effect. Moreover, the optimized energy storage effect is observed after La doping. With appearance of “slimmer”P-Eloops, both calculated recoverable energy storage densityWrecand storage efficiencyηincrease to 0.23 J/cm3and 22.8%, respectively. These results denote La doping conduces to the improvement of non-piezoelectric properties of BNT-based ceramics in a certain range. Therefore, La doping should be an adopted modification strategy for lead-free ceramics used in areas like refrigerator and pulse capacitors.Keywords:BNT-based lead-free ceramics;electric properties;ferroelectric to ergodic relaxor state transition;La doping
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Yifan Li,Jingyang Wang,Yu Wang,Shuang Cao,Zhenyu Han,Meng Zhang,Lei Zhang
Dion–Jacobson-type (DJ-type) perovskite CsA 2 Nb 3 O 10 (A = Ca, Sr, Ba) is a compound that can simultaneously accommodate Cs + and A 2+ ions and thus considered as a potential immobilization matrix for radionuclides 137 Cs and 90 Sr. In this work, using A 2+ to simulate bivalent alkaline earth metals, CsA 2 Nb 3 O 10 single crystals were synthesized by the molten salt method. CsA 2 Nb 3 O 10 has good thermal stability up to 900°C. At the same time, CsA 2 Nb 3 O 10 has strong radiation resistance, with most crystals maintain their initial morphology with slight color change. Cations with smaller radii, for example, Na + , K + , and Rb + , do not replace Cs + in the interlayer of CsA 2 Nb 3 O 10 and A 2+ in the NbO 6 polyhedron. CsA 2 Nb 3 O 10 demonstrates a wide range of pH durability, where its frame structure remains stable in the pH range from 2 to 12 and will not be decomposed, while Cs + in CsA 2 Nb 3 O 10 loses more into the solution at the pH range from 2 to 4 and from 10 to 12, and the loss of Sr 2+ and Ba 2+ is much lower than that of Ca 2+ due to slight differences in the framework structure. Further sintering of CsCa 2 Nb 3 O 10 and CsSr 2 Nb 3 O 10 result in high density ceramic with a relative density of 94%–97%, along with improved chemical stability. According to the investigation of the surface morphology and elemental chemical state, it can be confirmed that Cs, A, and Nb elements are uniformly distributed on the surface of ceramics. The normalized leaching rates of Cs, Ca, and Sr in the CsCa 2 Nb 3 O 10 and CsSr 2 Nb 3 O 10 ceramic waste forms are about 1, 1, and 10 −4 to 10 −3 g·m −2 ·d −1 after 28 days, respectively.
研究领域:
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2025
·
IF 3.5
Y.T. Liu,Y. Ji,W.J. Zhu,Q. Qian,Q.Y. Zhang
0.9 μm fiber lasers enable efficient generation of blue laser via second-harmonic conversion, which are essential light sources for applications such as undersea communications, laser displays, and biophotonic imaging. Glass fibers doped with Nd 3+ ions serve as the gain medium for these lasers; however, the competition from the four-energy-level transition 4 F 3/2 → 4 I 11/2 remains a significant challenge. Fluorophosphate (FP) glass combines the high rare-earth solubility of phosphate glasses with the low phonon energy of fluoride, particularly benefiting from large crystal field strength that enhances the 4 F 3/2 → 4 I 9/2 transition. Nonetheless, crystallization and phase separation in FP glass pose substantial challenges for this multi-component glass system. Herein, a novel Nd 3+ -doped Sr(PO 3 ) 2 −Ba(PO 3 ) 2 −AlF 3 −MgF 2 glass is reported. A thermodynamic approach was employed to predict the glass-forming region of the Sr(PO 3 ) 2 −AlF 3 −MgF 2 system, providing a robust design framework for FP compositions with superior glass-forming ability. Further investigations into the gradual substitution of Ba(PO 3 ) 2 to Sr(PO 3 ) 2 elucidate the structure-property relationship between the local network environment and Nd 3+ emission at 0.9 µm. The optimized FP glass demonstrates remarkable stability against crystallization (Δ T >100 °C), a high branching ratio (47.2 %), a large emission cross-section (2.36 × 10 −20 cm 2 ), an extended lifetime (334 μs), a high spectral quality factor (7.88 × 10 −24 cm 2 ·s), and a broad gain bandwidth (10.71 × 10 −26 cm 3 ) at 0.9 μm, surpassing previously reported glass hosts and establishing it as a highly promising host material for 0.9 μm fiber laser applications.
研究领域:
光子学
·
材料科学
·
光学材料
·
激光技术
·
玻璃科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Jun Xu,Jiabei Sun,Xiaoming Liu,Sisi Zhan,Yanqing Li,Along Gao,Jun Lin
In this work, a series of Eu2+-activated phosphors, including Sr3Sc4-xO9:xEu2+, Ba3(1–y)Sr3ySc3.985O9:0.015Eu2+ (0 ≤ y ≤ 1), and Ba3Sc4-xO9:xEu2+, were successfully synthesized via a sol–gel method. The Sr3Sc4-xO9:xEu2+ phosphors exhibited a broad red emission band centered at 609 nm under 430 nm blue-light excitation, with a measured internal quantum yield of 47.94%. Upon partial substitution of Sr2+ by Ba2+ in Sr3Sc3.985O9:0.015Eu2+, a pronounced redshift in the emission maximum was observed, extending from 609 to 843 nm and thereby covering the entire visible to near-infrared (NIR) spectral range, corresponding to a total shift of 234 nm. Structural analysis indicates that the emission behavior of Eu2+ is strongly influenced by its coordination environment within [Sr/Ba1O6] and [ScO6] octahedra, which exhibit low-symmetry fields and induce substantial crystal field splitting (CFS). Thermal quenching behavior was evaluated by monitoring emission intensity at 150 °C, where Sr3Sc3.985O9:0.015Eu2+, Sr1.5Ba1.5Sc3.985O9:0.015Eu2+, and Ba3Sc3.985O9:0.015Eu2+ retained 85.8%, 75.1%, and 65.8% of their room-temperature luminescence, respectively. These findings demonstrate excellent thermal stability and tunable red-to-NIR emission, establishing this phosphor family as a promising candidate for next-generation NIR-emitting materials and photonic applications.
研究领域:
材料科学
·
光学
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 20
·1-13
·
IF 2.8
Xie Linqiang,Ding Jiangtao,Liu Han,Lu Di,Yu Wanchun,Hu Te,Lin Jiayang,Cheng Zhenzhi,Gao Fei,Luo Guangsheng,Zhou Weiping
Soft magnetic composites with enhanced permeability and reduced power loss are urgently needed in the next generation of power electronics and electrical machines. However, traditional insulation techniques suffer from the uneven coating or complex process, which cannot meet these requirements. Here, the feasibility of Ba(OH) 2 as a coating layer of soft magnetic powder is explored. Due to its low melting point, Ba(OH) 2 exhibits good flowability in the molten state, enabling it to evenly coat FeSiAl particles and fill interparticle gaps, thereby forming a uniform, dense insulating layer. This novel coating strategy improves the formability of the magnetic powder cores and optimizes the cores’ soft magnetic performance. Compared with SMPCs without Ba(OH) 2 coating, FeSiAl@Ba(OH) 2 SMPCs have higher magnetic permeability (μ e = 59.5), higher quality factor ( Q max = 127.3), lower high-frequency power loss ( P cv = 2062.9 mW/cm 3 @1 MHz and 50 mT), and good DC bias performance. Our results provide a new approach for the design of insulation coatings for SMPCs, demonstrating significant application potential for high-frequency electronic devices.
研究领域:
材料科学
·
电气工程
·
应用物理学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Dongjie Liu,Xiaohan Yun,Peipei Dang,Hongzhou Lian,Mengmeng Shang,Guogang Li,Jun Lin
Recently, there has been growing interest in developing Bi3+-activated luminescence materials for optoelectronic applications. Herein, new yellow/orange-emitting ABZn2Ga2O7:Bi3+ (ABZGO, A = Ca, Sr; B = Ba, Sr) phosphors with tunable optical properties are synthesized by an alkaline earth cation substitution. When Sr2+ substitutes Ca2+ and Ba2+, the excitation wavelength has a red shift from 325 to 363 nm, matching well with the n-UV chip based white light-emitting diodes (WLEDs). CaBaZn2Ga2O7:0.01Bi3+ (CBZGO:0.01Bi3+) exhibits two evident emission peaks at 570 and 393 nm originating from the respective occupation of Ca and Ba sites by Bi3+ ions. The optical tuning of the CBZGO:Bi3+ phosphor is achieved by changing the Bi3+ doping content and excitation wavelength based on the selected site occupation. Differently, both SrBaZn2Ga2O7:0.01Bi3+ (SBZGO:0.01Bi3+) and Sr2Zn2Ga2O7:0.01Bi3+ (SZGO:0.01Bi3+) phosphors exhibit a single broad emission band, peaking at 600 and 577 nm, respectively. Two different Bi3+ sites are also verified respectively in SBZGO and SZGO hosts by the Gaussian fitting of the asymmetric PL spectra and lifetime analysis. The different luminescence behaviors of ABZGO:0.01Bi3+ phosphors should be ascribed to the synergistic effect of the centroid shift, crystal-field splitting, and Stokes shift. Moreover, the temperature-dependent PL spectra reveal that cation substitutions of Sr2+ for Ca2+ and Ba2+ can efficiently improve the thermal stability of ABZGO:0.01Bi3+ phosphors. In view of different thermal responses to various temperatures for two emission peaks of the CBZGO:0.01Bi3+ phosphor, an optical thermometer is designed and has a good relative sensitivity (Sr = 1.453% K–1) at 298 K. Finally, a WLED with CRI = 97.9 and CCT = 3932 K is obtained by combining SZGO:0.01Bi3+ and BAM:Eu2+ phosphors with a 370 nm n-UV chip, demonstrating that SZGO:0.01Bi3+ is an excellent yellow-orange-emitting phosphor for n-UV WLED devices. This work stimulates the exploration of optical tuning by cation substitution to obtain remarkable luminescence materials for optical temperature sensing and WLED applications.
研究领域:
材料科学
·
光电子学
·
发光与荧光粉
·
固态照明
·
温度传感
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Chao Dou,Shengqiang Liu,Fangyi Zhao,Zhen Song,Quanlin Liu
The discovery of violet-excitable blue-emitting phosphor is a significant breakthrough for the development of phosphor-converted full-spectrum white light-emitting diodes (WLEDs). However, the application of most known violet-excitable blue-emitting phosphors is limited by their low external quantum efficiency (EQE). In this work, we reported on how the EQE values of Eu2+-doped Ba(K)-β-Al2O3 blue-emitting phosphor can be significantly improved through lattice site engineering. By partially substituting K+ for Ba2+, the Eu2+-occupied crystallographic site changes and the coordination polyhedron of Eu2+ shrinks, leading to the increase of crystal field splitting. Consequently, the excitation spectrum exhibits a continuous red shift to match the violet excitation, which enhances the PL intensity of solid solution phosphor (Ba0.4K1.6)0.84Al22O35−α:0.32Eu2+ ((B0.4K1.6)0.84AO:Eu) by 1.42 times compared to that of the end-member Ba1.68Al22O35−α:0.32Eu2+ (B1.68AO:Eu) phosphor. Correspondingly, under the 400 nm violet light excitation, the EQE of optimal blue-emitting (B0.4K1.6)0.84AO:Eu phosphor is up to 53%. Additionally, the phosphor also shows excellent resistance to luminescence thermal quenching (95% at 150 °C). Finally, the WLED fabricated based on (B0.4K1.6)0.84AO:Eu and commercial green and red phosphors exhibited an ultra-high color rending index with Ra = 95.5 and R1–R15 >90. This work offers guidance for tuning the spectral properties of phosphors through lattice site engineering.
研究领域:
材料科学
·
光子学
·
固态照明
·
发光材料
·
光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）