Journal of Materiomics
·
2025
·
IF 9.6
Tauqeer Ahmad,Wen Lei,Burhan Ullah,Wen-zhong Lu
A series of (Sr 0.4 Ce 0.4 )TiO 3 + 4% (in mass) Sr 2 CeO 4 + x % B 2 O 3 (SCTO + 4% SCO + x % B 2 O 3 for 1≤ x ≤ 5) composites were synthesized via solid-state reaction to investigate the effects of Sr 2 CeO 4 and B 2 O 3 additives on their structural evolution and microwave dielectric properties. X-ray diffraction (XRD) and Rietveld refinement confirmed the dominant orthorhombic phase (O-phase), with SCO as a secondary phase, indicating a chemically stable composite system. HRTEM and SAED analyses further confirmed the formation of the O-phase through direct observation of the superlattice reflections. Microstructural evolution demonstrated B 2 O 3 -assisted liquid-phase sintering, reducing porosity (0.017→ 0.006) and increasing grain size (3.34 → 6.01 μm) with increasing x % (in mass). Raman spectroscopy verified octahedral tilting and Ce–O stretching, while B 2 O 3 incorporation modified the TiO 6 network via BO 3 /BO 4 interactions. The ε r decreased from 113 (SCTO) to 27 at x = 5%, while τ f improved from +213 to +12×10 –6 /°C. The reduction in ε r arises from a complex interplay of internal factors (ionic polarizability) and external factors (porosity, and density), whereas the variation in τ f is governed by compensating effects from Sr 2 CeO 4 and B 2 O 3 . Optimal microwave performance was achieved at x = 5%, with Q×f = 43,603 GHz, ε r =27, and τ f of +12×10 –6 /°C. The study demonstrates that SCO and B 2 O 3 act as effective modifiers, enhancing densification and dielectric properties in SCTO-based microwave ceramics.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Weichen Xu,Xiaomeng Li,Hong Wang,Fuliang Wang,Shouqiang Han,Jing Guo
Microwave dielectric ceramics are critical components in wireless communications. However, it is still a challenge to develop microwave dielectric ceramics with reduced sintering temperatures, high thermal stabilities and good dielectric properties at the same time. Herein, the entropy value, which is able to modulate the grain boundary energy and adjust the inherent sintering temperature, is engineered to develop high-performance microwave dielectric ceramics with low sintering temperatures. The structure-property relationships of AWO 4 ceramics, including (NaCaBi) 1/3 WO 4 , (NaCaSrBi) 1/4 WO 4 , (NaLiCaBiSm) 1/5 WO 4 and (NaLiCaSrBiSm) 1/6 WO 4 with increased entropy values are investigated systematically. X-ray diffraction and high-resolution TEM analyses confirm the formation of single-phase solid solutions with the tetragonal scheelite structure in AWO 4 ceramics. As the number of elements in the A-site varies, the relative permittivities, Q × f values and TCF values shift in the range of 12.2–16.5, 8,000–25,000 GHz and −32.3–31.6 ppm/°C, respectively. Simultaneously, the high-entropy samples demonstrate the lowest sintering temperature of 750 °C among the four formulations. Phillips-Van Vechten-Levine (PVL) complex chemical bond theory reveals that the covalency, lattice energy and bond energy affect the relative permittivity, Q × f value and TCF value, respectively. Raman spectra suggest that high entropy value leads to increased disorder, and infrared reflectivity spectra illustrate that the dielectric response is dominated by polarized optical phonons of [WO 4 ] tetrahedron. It is anticipated that entropy design will facilitate the development of microwave dielectric ceramics in low temperature co-fired ceramic applications.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-11
·
IF 6.232
Guo Hao,Wu Ning,Xue Rui,Liu Hui,Wang Mingyue,Yao Wenqin,Wang Xiaoqiong,Yang Wu
An Eu(III)-functionalized strontium-organic framework (Eu 3+ @Sr-MOF) was synthesized by encapsulating Eu 3+ ions into the pores of Sr-MOF via postsynthetic modification (PSM) and fully characterized by XRD, SEM, EDS, FTIR, and TGA. The luminescent properties of Eu 3+ @Sr-MOF were measured and investigated in detail, which demonstrated that Eu 3+ @Sr-MOF not only possessed excellent water and chemical stabilities in a wide pH range (5–10) but also displayed red luminescence with excitation/emission maxima at 332/617 nm. The Eu 3+ @Sr-MOF can be considered as a highly selective and sensitive recyclable luminescence probe for sensing Cr(III) and Cr(VI) based on strong luminescence quenching effects; it can be recycled at least five times. The luminescence probe for Cr 3+ , CrO 4 2− , and Cr 2 O 7 2− shows low detection limits (0.15 μM, 0.17 μM, and 0.13 μM, respectively), relatively broad linear ranges (0.6–150 μM, 0.1–200 μM and 0.4–180 μM, respectively), and high quenching constants K SV . The signals can be observed by the naked eye under UV light of 365 nm. The method was applied to the determination of total Cr in environmental water samples.
Graphical abstract
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MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Chuanhui Xu,Jianfeng Fan,Daosheng Yuan,Yanpeng Wang,Yukun Chen
Peroxide-induced dynamic vulcanization of poly (vinylidene fluoride)/silicone rubber (PVDF/SR) blends was studied in this paper. We controlled the size of rubber particles by changing the rotor speed , and discussed the influence of shearing on the particle diameter and the particle diameter polydispersity ( d p ). The size of SR particle was confirmed to be decreased with increasing the rotor speed. However, a good matching degree of shearing and crosslinking rate helped the SR phase to achieve a uniform crosslinking, as well as a narrow d p . In this particular PVDF/SR system, the suitable rotor speed was found to be 90 rpm, at which the d p reached a minimum of 1.1981 and 1.1614 for the P9S1 and the P7S3, respectively. At last, we discussed the influences of the macroscopic breaking energy ( E dk ) and the coalescence ( P ) on the number-average particle diameter ( D n ) of the SR. This work is thus devoted to construct a model for predicting the particle size in dynamic vulcanization of PVDF/SR blends.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Xuewen Luo,Cuiting Su,Zihao Chen,Lei Xu,Lin Zhao,Jiawen Zhao,Rongliang Qiu,Zhujian Huang
Direct heterogeneous catalysis is conducted to decontaminate antibiotic polluted water for the first time. Perovskite-structured composites La x Sr (1- x ) CoO 3-δ (LSC) are synthesized by a green mechanical milling method (as it involves no organic solvent, generates no wastewater, and is viable for industrial-scale use) and applied for the efficient catalytic degradation of doxycycline (DC) via singlet oxygen without the addition of chemical reagents or illumination. The oxygen vacancy produced during ball milling stores numerous electrons. These electrons and singlet oxygen exert a synergistic effect on the catalytic reaction, thereby improving the catalytic degradation of DC. LSC can effectively catalyze the degradation of DC in the dark. The total organic carbon removal efficiency reaches 89.64%, indicating that most DC is eventually mineralized to CO 2 and H 2 O. The catalytic degradation of DC follows two principal degradation pathways involving 13 intermediates. Toxicity prediction indicates that the toxicity of the products initially increases and then decreases with the degradation process and that the final products are not toxic. This study not only allows a facile synthesis route for catalyst preparation but also promotes the development of a green method for wastewater treatment.
研究领域:
环境科学
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材料科学
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催化化学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Ningfei Huang,Wei Zhang,Yang Ye,Tao Liu,Wei Xie,Qiuzhi Liang,Jie Lin,Zuyong Feng,Guangting Xiong
Based on the SrLaLiWO 6 matrix, the study satisfactorily synthesized a red phosphor doped with Eu 3+ . Regulation of Ca 2+ doping to control the red-to-blue emission ratio of the phosphor. Analysis of the content and structure of the samples verified the production of high-purity (Sr,Ca)LaLiWO 6 : Eu 3+ phosphor. When blue light at 464 nm excites the phosphor, it emits intense red light. The emission intensity of Eu 3+ ions rose when Ca 2+ was incorporated to the SrLaLiWO 6 matrix. In the meantime, the Sr 0.96 Ca 0.04 La 0.7 LiWO 6 : 0.3Eu 3+ phosphor shows comparatively high quantum efficiency and thermal stability. When the blue light-emitting chip is coupled with the Sr 0.96 Ca 0.04 La 0.7 LiWO 6 : 0.3Eu 3+ phosphor, the emission spectrum produced matches the absorption spectra of plant pigments. Consequently, the prepared sample is an excellent red-emitting phosphor with potential application value.
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Journal of Materials Research and Technology-JMR&T
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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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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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MATERIALS RESEARCH BULLETIN
·
2015
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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
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无机化学
·
发光材料
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固体物理
·
光电子学
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PHYSICA B-CONDENSED MATTER
·
2022
·
IF 2.988
Yuhong Zhang,Yibin Guo,Xingke Zheng,Pengcheng Wang,Hang Liu
A series of AWO 4 (A = Sr, Ca): Yb 3+ /Tm 3+ /Gd 3+ /Er 3+ phosphors are successfully prepared by solid-state method. In comparison with the samples without Gd 3+ ions, the UC emission intensity of CaWO 4 : 0.5 mol%Tm 3+ /1 mol%Yb 3+ /10 mol%Gd 3+ sample has increased by 104 times (∼475 nm), 71 times (∼655 nm) and 23 times (∼795 nm) due to the shrink of the host lattice with the Gd 3+ ions corporation. Based on the fluorescence intensity ratio (FIR) of non-thermal couple levels(non-TCLs), the temperature sensing characteristics are investigated for AWO 4 (A = Sr, Ca): Yb 3+ /Tm 3+ /Gd 3+ /Er 3+ phosphors. The maximum values of absolute sensitivity and relative sensitivity are 0.09356 K -1 and 1.499% K −1 for CaWO 4 : Yb 3+ /Tm 3+ /Gd 3+ /Er 3+ phosphor. It indicates that the AWO 4 (A = Sr, Ca): Yb 3+ /Tm 3+ /Gd 3+ /Er 3+ phosphors can be applied to develop optical thermometry.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jie Li,Jianhui Lan,Runjian Cao,Jun Sun,Xiangdong Ding,Xue Liu,Liyong Yuan,Weiqun Shi
Covalent organic frameworks (COFs) with crown ether units have drawn great attention due to their potential applications in adsorption, catalysis, and sensing. However, employing crown ethers to construct COFs is still challenging in light of the flexible nature of macrocycles. Here, a highly crystalline one-dimensional covalent organic framework (1D-18C6-COF) with crown ether units on the ribbon edge was synthesized. The water-mediated hydrogen bond network and π–π stacking hold the 1D COF ribbons together. The combination of experimental and DFT studies demonstrated that the hydrogen bond network plays a crucial role in the structure crystallinity. The 1D-18C6-COF was applied as an adsorbent for strontium, and it exhibited rapid kinetics with good selectivity. In the competitive adsorption experiment, a separation factor of 1900 was achieved, representing one of the largest values for cesium/strontium separation. This work provides new insights into the design and functional exploration of crystalline COFs with flexible units.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 43
·15294-15302
·
IF 6.4
Tianyu Liu,Bo Yan,Jinxu Ma,Qiang He,Linan An,Kepi Chen
The development of dielectric capacitors for applications under medium-low fields is of great significance to the integration and miniaturization of electronic circuits. Lead-free piezoelectric ceramics based on the morphotropic phase boundary (MPB) compositions have made great progress in the past two decades. In this study, we selected an MPB composition of 0.8525BNT–0.10995BKT–0.03755BT (BBNKT) as the matrix and Sr(Mg1/3Nb2/3)O3 (SMN) as the end member to form relaxor ferroelectric ceramics for energy storage applications. We showed that 0.85BBNKT–0.15SMN ceramics exhibited a recoverable energy storage density Wrec of 3.53 J cm−3 and an efficiency η of 86.3% at a medium-low electric field of 310 kV cm−1. The ceramics also exhibited good thermal stability (25 °C–180 °C), frequency stability (1 Hz–100 Hz), and fatigue resistance (>105 cycles). The current study provided a new idea for the compositional design of energy storage ceramics by modifying the piezoelectric ceramics with MPB compositions into high-entropy relaxor ferroelectrics.
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