JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 15
·12771-12776
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IF 2.324
Qing Zhenjun,Ji Zhenguo
The effects of barium ions non-stoichiometry on the phase composition, microstructure, and microwave properties of Ba 1+x Co 2 V 2 O 8 (x = 0–0.5) ceramics were studied. XRD results show that the single phase of BaCo 2 V 2 O 8 was found in the composition of x equal to zero while a secondary phase of Ba 2 V 2 O 7 started to precipitate at 0.5 ≥ x ≥ 0.2, as confirmed by SEM and EDX. The appearance of Ba 2 V 2 O 7 phase with higher sintering temperature is the main reason of the increase of the optimum sintering temperature of the system. The comparisons between theoretical and experimental values of microwave dielectric properties indicate that the appearance of second phase (Ba 2 V 2 O 7 ) leads to the decrease of dielectric constant and the improvement of the temperature coefficient of frequency and the quality factor values. Ba 1.5 Co 2 V 2 O 8 ceramic sintered at 925 °C showed good properties: ε r = 11.5, Q × f = 47,230 GHz and τ f = − 32.1 ppm/°C.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Xiaofen Wang,Jiang Ma,Xirui Lu,Zhiwei Fang,Lingshuang Li,Linyan Li,Yushan Yang
Hollandite ceramics are considered as a promising host matrix for cesium immobilization. In the paper, [Cs x Ba y ][Fe 3+ 2 y + x Ti 4+ 8-2 y - x ]O 16 (0.3 ≤ x , y ≤ 0.75) ceramics were synthesized by solid-state reaction method using 133 Cs and 133 Ba as the substitutes for radioactive Cs and its daughter product Ba. It was found that the as-prepared (Cs,Ba)-hollandite solid solution shows a tetragonal structure ( I 4/m) with >90% crystallinity and good Cs retention at 1250 °C. Moreover, the normalized release rates of Cs and Ba are in the order of 10 −3 g m −2 d −1 for 28 days, exhibiting excellent aqueous durability.
研究领域:
材料科学
·
核废物管理
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DOI
高影响因子
OPTICS EXPRESS
·
2025
·Vol. 33
·期 4
·8043-8054
·
IF 3.3
Mengjiao Li,Xiaoshuai Zhang,Xiaoyi Ma,Jia Li,Jie Gong,Panlai Li,Panlai Li,Xiaoyan Yu,Zixuan Wang,Chengrun Liu,Guodong Zhang,Guodong Zhang,Zhijun Wang,Zhijun Wang
To facilitate the development of near-infrared light sources for photovoltaic and night-vision lighting applications, it is crucial to obtain novel near-infrared emitting phosphors. Herein, a novel Eu2+-activated broadband near-infrared emitting phosphor CaScBO4: Eu2+ is reported. Under 558 nm light excitation, CaScBO4: Eu2+ exhibits broadband near-infrared emission centered at 780 nm with a full width at half maxima of 147 nm. The luminescence intensity is significantly enhanced by 7-fold through a cation modulation strategy using Ba2+ for Ca2+ substitution. The mechanism of the increase of the luminescence intensity is explained in detail by the change in the symmetric stretching force of the B-O bond before and after the substitution. Finally, the Ca0.85Ba0.15ScBO4: Eu2+ phosphor was encapsulated in a 558 nm chip to form a phosphor-converted light-emitting diode device, and exploratory experiments were performed to explore the applications in night vision lighting. The results show that the phosphor has great potential for application in the field of night vision lighting.
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Building Engineering
·
2023
·
IF 6.4
Ting Zhang,Hongbo Tan,Jian Ni,Baoguo Ma,Xiaohai Liu,Pian Chen,Tao Shi
To lower the corrosion hazards of the steel bar in reinforced concrete, binding chloride ion by producing Cl-AFm is an effective way. In the presence of calcium ions and sulfate ions, Cl-AFm could transform into ettringite , and release the chloride ions into pore solution , with negative effect on reinforced concrete. In order to avoid the negative effect, barium ion was introduced to preferentially precipitate the sulfate ions. In this study, the effect of barium ion on the transformation reaction of ettringite into Cl-AFm was studied, and the combination effect of barium ion and sulfate ion on chloride binding was discussed. The results showed that barium ion could improve the chloride binding capacity of ettringite. The mechanism was that barium ion could be precipitated by sulfate from AFt to form BaSO 4 , and then result in the formation of Cl-AFm.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2015
·
IF 2.947
Chuande Huang,Xiaodong Wang,Xin Liu,Ming Tian,Tao Zhang
In this paper, the phase evolution, microstructure changes, and element diffusion for the formation of BaSnO 3 from BaCO 3 and SnO 2 were extensively investigated. It was found that BaCO 3 rapidly diffused on surface of SnO 2 at the initial stage of the reaction (approximately 700 °C), forming a uniform BaSnO 3 shell. Subsequently, BaSnO 3 grew via two different routes depending on the calcination temperature. When the reaction was carried out below 820 °C, BaSnO 3 phase further grew by diffusion of barium ions across BaSnO 3 layer to SnO 2 phase, since the BaSnO 3 interlayer prevented the direct reaction between surface BaCO 3 and SnO 2 core. Once a higher temperature above 820 °C was provided, Ba 2 SnO 4 were generated by reaction between BaCO 3 and BaSnO 3 shell. Under such circumstances, pure BaSnO 3 was obtained by diffusion of barium ions from Ba 2 SnO 4 across BaSnO 3 to SnO 2 . The rate-determining step in both cases was assigned to the diffusion of barium ions.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yushan Yang,Xiaofen Wang,Shunzhong Luo,Xiaoyong Yang,Jiang Ma
[Cs x Ba y ][(Al 3+ ,Ti 3+ ) 2 y + x Ti 4+ 8-2 y - x ]O 16 (0.4 ≤ x , y ≤ 0.8) ceramics were synthesized to investigate the substitution effects of Ba 2+ for Cs + on the stability of hollandite-ceramic waste forms. It was found that the substitution of Ba 2+ for Cs + in the (Cs,Ba)-hollandite system does not cause substantial variation in the crystallographic phase and microstructure. The normalized release rates of Cs and Ba at 90 °C in deionized water were < 0.005 g m −2 d −1 after 28 days. These results indicate that hollandite ceramics are an ideal host for permanent radioactive caesium disposal.
研究领域:
材料科学
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核废料管理
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DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2022
·Vol. 53
·期 5
·1023-1032
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IF 2.925
Luo Yuhua,Yao Haifeng,Zhang Yahui,Dong Yongping
Abstract In this paper, a sensitive electrochemiluminescence (ECL) method for the detection of Ba 2+ was proposed based on its apparent enhancing effect on the anodic luminol ECL at a cucurbit[7]uril (Q[7])-modified glassy carbon electrode (Q[7]/GCE). The cavity of the modified Q[7] could accommodate more dissolved oxygen at the electrode surface which reacted with luminol to generate strong anodic ECL signal compared with a bare GCE. Ba 2+ ions exhibited further enhancing effect on luminol ECL when they were immobilized at the portal of Q[7] through chelating with carbonyl group of Q[7]. The increment of ECL signal varied linearly with the concentration of Ba 2+ , as a result, an ECL sensor for the quantitative detection of Ba 2+ was constructed. Under the optimal condition, Ba 2+ could be sensitively detected in the range of 1.0 × 10 –7 to 1.0 × 10 –4 mol L −1 , and the detection limit was calculated as 10 nM (3σ). The proposed ECL sensor exhibited satisfactory analytical performance and could be used in real samples analysis, which provided a new strategy for metal ions detection. Graphic abstract
The encapsulation of dissolved oxygen by Q[7] can enrich oxygen concentration at
the electrode surface, which can react with luminol to emit enhanced ECL. The
presence of Ba 2+ can increase the amount of O2
•- at the electrode surface through the
formation of barium-peroxide species, which can further enhance luminol ECL. Thus,
an ECL sensor for the sensitive detection of Ba 2+ was built.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Baochen Wang,Ziyao Wang,Yangai Liu,Shiling Duan,Zhaohui Huang,Minghao Fang
Control of Eu valence is one of the main issues to obtain mixed−valent Eu 2+/3+ co−doped phosphor with flexible−tunable emission spectra. In this study, for the first time, we report a simple single cation substitution strategy for controlling Eu valence. The structure of Sr 1− x Ba x Al 2 Si 2 O 8 host was tailored by Ba 2+ substitution for Sr 2+ ions. The lattice parameters show a linear evolution with increase in Ba 2+ amount. Correspondingly, the Eu 3+ emission intensity also increases over Ba 2+ amount. The spectral variation was considered to be attributed to the suppression of Eu 3+ reduction by the lattice stress, which is introduced by ion substitution. Finally, valence control of Eu and spectral tuning of Eu 3+/2+ co−doped Sr 1− x Ba x Al 2 Si 2 O 8 phosphor were realized by the proposed strategy. This study will open a novel avenue for Eu valence control and spectral tuning of mixed–valent Eu doped phosphors.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 14
·8538-8545
·
IF 2.599
Li Gang,Zhang Guoping,Sun Rong,Wong Ching-Ping
Alginate/polyacrylamide hybrid hydrogel has attracted intense interests in different fields, but the low tensile strength and stiffness limit its comprehensive application. In this hydrogel system, the alginate–cation network plays an important role. Thus, based on the unique structure of alginate and its special interaction with different metal cations, we designed a new method of introducing barium and ferric ions together to crosslink the alginate sufficiently, creating a stronger alginate network. As a result, the prepared hybrid hydrogel exhibits enhanced strength and stiffness, which may serve as a new way to develop stronger hydrogel.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Jie Yang,Huan Zhou,Jie Li,Cunbing Xu,Yifan Li,Sifan Wang,Jiangbo Chen
The solid–liquid phase equilibria of the Ba2+//Cl–, S2–, and OH––H2O quaternary system and its three subternary systems at 298.15 K are studied via the isothermal solubility phase equilibrium method. The solubility data, liquid properties of density and pH, and phase diagrams of the ternary and quaternary systems are obtained. Solid species of Ba(OH)2·8H2O, BaCl2·2H2O, Ba(OH)Cl·2H2O, and BaS exist in the quaternary system and corresponding ternary systems at 298.15 K. The four solid species build up two invariant points, one disproportionate and one proportionate, and four phase regions. The largest phase area is covered by Ba(OH)·8H2O, and the lowest water point is the proportionate invariant point saturated by BaCl2·2H2O, Ba(OH)Cl·2H2O, and BaS.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
INFRARED PHYSICS & TECHNOLOGY
·
2023
·
IF 3.3
Bin Duan,Changchun Ding,Yuxiang Wu,Yongqiang Li,Wei Jin,Fengyi Wang,Junshan Hu
The present work investigates the near-single green emission properties of Ba 2+ doped Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ upconversion luminescence. The Ba 2+ doped Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ phosphors were successfully synthesized via the high-temperature solid-phase method. XRD pattern analysis showed that Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ was a single phase, and Ba 2+ doping did not induce heterophase phase. Under 980 nm near-infrared laser irradiation, Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ phosphors emit strong green luminescence (530 nm, 2 H 11/2 → 4 I 15/2 , 557 nm, 4 S 3/2 → 4 I 15/2 ) and weak red luminescence (664 nm, 4 F 9/2 → 4 I 15/2 ). The upconversion green-red luminescence integral intensity ratio of Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ phosphor is 32.1. This enhancement can be attributed to the presence of defect bands that facilitate excitation photon absorption and efficient energy transfer from abundant electrons into Yb 3+ ( 2 F 5/2 ) and Er 3+ ( 4 I 11/2 ) ions. More importantly, the maximum S A and S R of Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ phosphor as a temperature sensor are 1.44 % K −1 (at 548 K) and 1.28 % K −1 (at 298 K), respectively.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Shixue Zhong,Yan Xin,Li’e Mo,Bijiao He,Fang Zhang,Chen Zhao,Linhua Hu,Huajun Tian
Manganese-based layered compounds offer promising cathode materials for aqueous zinc-ion batteries (AZIBs) due to their high safety, low cost, and environmental friendliness. However, their sluggish reaction kinetics, poor conductivity, and irreversible manganese dissolution result in severe capacity fading. Herein, a simple two-step method is successfully proposed to intercalate Ba2+ ions into layered manganese oxide (Ba-MnO2), which were utilized as cathode materials for AZIBs. Ba2+ ions have been innovatively introduced into the MnO2 cathode, generating abundant oxygen vacancies. Notably, the incorporated Ba2+ spontaneously forms an in situ BaSO4 layer during charging, which functions as a protective cathode electrolyte interface. These improvements promote the conductivity and ion diffusion of MnO2, enabling a reversible MnO2/Mn2+ deposition/dissolution reaction. The Zn//Ba-MnO2 full battery delivers a high capacity of 355 mA h g–1 at 0.3 C and maintains an ultrastable cycling stability of over 1200 cycles even at 3 C. This work provides an innovative strategy and a profound understanding of designing high-performance cathodes for AZIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）