JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Di Pan,Yiping Guo,Kai Zhang,Huanan Duan,Yujie Chen,Hua Li,Hezhou Liu
In this work, (K 0.48 Na 0.52 )NbO 3 −0.05Ca x (Bi 0.5 Na 0.5 ) 1− x ZrO 3 lead-free piezoelectric ceramics were prepared by a conventional solid-state sintering method. The effects of Ca content on their phase structure, microstructures, and piezoelectric properties were systematically studied. With the increasing of Ca content, the rhombohedral-orthorhombic phase temperature gradually increases and Curie temperature of the ceramics without a conspicuous change. In addition, appropriate Ca ( x ≤ 0.2) content promotes the grain growth, which leads to a denser microstructure. Rhombohedral-orthorhombic and orthorhombic-tetragonal phase coexistence has been obtained in the composition range of 0.15 ≤ x ≤ 0.3. The ceramics with x = 0.2 possess enhanced piezoelectric properties of d 33 ∼308 pC/N and k p ∼49.0%, together with a high Curie temperature of T C ∼328 °C. Therefore, the material system of this work is a promising candidate for piezoelectric applications.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tengfei Yu,Rongrong Chen,Xiang Ji,Zhijun Fu,Subing Jiang,Meizhen Gao
In this study, we investigated the phase structure, Curie temperature, dielectric properties, piezoelectricity, and energy-storage properties of BiFeO 3 (BFO)-modified (Ba 0.95 Ca 0.05 ) (Ti 0.89 Sn 0.11 )O 3 (BCTSO) ceramics using both experimental and theoretical methods. The results indicated that the lattice distortion and chaotic distribution of the local charge increased with the BFO content, resulting in a phase transition and transformation from a ferroelectric to a relaxing ferroelectric. First-principles calculations revealed that the Curie temperature decreased with increasing BFO content, primarily because of an increase in the ground state energy. The variation in the permittivity of the BCTSO- x BFO ceramics with temperature and frequency is affected by the phase structure and Maxwell-Wagner interface polarisation, respectively. The electrical modulus measurements indicated that BCTSO- x BFO exhibited non-Debye-type dielectric relaxation for x = 0.0, 0.1, and 0.5 %, whereas BCTSO- x BFO showed Debye-type dielectric relaxation for x = 0.9%.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Yi Wei,Zhiyu Gao,Xiaohan Yun,Hang Yang,Yixin Liu,Guogang Li
Near-infrared light-emitting diodes (NIR-LEDs) are potential candidates in food composition analysis, temperature and security monitoring, biometrics, and medical applications. To realize the above objectives, the development of NIR-emitting phosphors is urgently required. Herein, a novel NIR emission is successfully achieved in Bi3+-activated XAl12O19 (X = Ba, Sr, Ca) compounds by constructing the selective site occupation of Bi3+ in Al3+ polyhedra with small coordination number. The designed phosphors exhibit broad-band NIR emission of Bi3+ from 600 to 1000 nm. Interestingly, a broad photoluminescence control from blue to red is also achieved by just changing the sintering atmosphere. The blue emission of Bi3+ should be assigned to the prior occupation in X2+ sites and the existence of oxygen vacancy. This work not only provides a novel insight to develop NIR-emitting Bi3+-activated phosphors but also helps to reveal the underlying NIR luminescence mechanism of Bi3+ in inorganic compounds.
研究领域:
材料科学
·
发光材料
·
固态化学
·
光学材料
·
无机化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Xianglei Liu,Tong Wang,Ke Gao,Xianguang Meng,Qiao Xu,Chao Song,Zhonghui Zhu,Hangbin Zheng,Yong Hao,Yimin Xuan
Solar thermochemical CO2 splitting to produce fuels is an effective route to reduce carbon emission. However, it is still a daunting challenge to achieve a high CO yield and good cycle stability simultaneously at a low reaction temperature. Here, Ca- and Ga-doped LaMnO3 is introduced for solar thermochemical CO2 splitting with an ultrahigh CO yield and excellent cycle stability at a moderate operation temperature. The average CO production reaches 513 μmol/g for La0.6Ca0.4Mn0.8Ga0.2O3 when operating between 1350 and 1050 °C. Such a high value sets a record among directly measured thermochemical CO production in the literature with the temperature swing limited within 300 °C. No obvious performance deterioration over eight cycles is observed due to stable structures. The high CO production of La0.6Ca0.4Mn0.8Ga0.2O3 can be attributed to the transition of the surface reaction to internal bulk diffusion induced by Ca doping and enhanced non-stoichiometry due to Ga doping. This work provides a promising alternative for solar thermochemical CO2 splitting with high fuel yield and cycle stability.
研究领域:
材料科学
·
可再生能源
·
催化
·
无机化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Shan Zhang,Mi Zhang,Xinye Zhou,Xuewen Li,Yangyang Ye,Zeyuan Chen,Kaining Yu,Qingyi Yang,Hui Sun,Min Li,Wenguang Liu,Xu Zhang
The composition and physical architecture of bone play vital roles in bone defect repair. Non-vascularized autografts are constrained by limited bone availability and unpredictable resorption. In this study, we synthesized artificial lamellar bone (ALB) by mimicking the physical structure of natural lamellar bone, integrating structure, properties, and function. Based on the principles of macromolecular crowding and charge shielding in regulating the hierarchical assembly of collagen, our strategy utilized the co -assembly of concentrated collagen with polyaspartic acid-Ca 2+ complexes (PAsp-Ca) to guide collagen ordered assembly and cross-linking, thereby fabricating a biomimetic organic scaffold. During assembly, abundant PAsp-Ca was embedded within the collagen, priming the dense collagen block for deep mineralization. The resulting mineralized ALB closely matched the structure, properties of natural bone and exhibited superior osteogenic performance to autograft in rat critical-sized mandibular defect models. The synergistic effect between new bone formation and material resorption persisted until ALB was completely replaced. This strategy establishes a new paradigm for enhancing the overall performance threshold of osteogenic materials.
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产品关联
DOI
高影响因子
ACTA MATERIALIA
·
2022
·
IF 9.209
Qian Liu,Ke-Feng Liu,Qi-Qi Wang,Xiao-Cun Liu,Fang Yu,Jian Liu,Yuan-Yuan Su,Sheng-Qing Xia
In this report, for the first time TiNiSi-type Zintl phases with the nominal formulae of ALiSb (A = Ca, Sr, Eu, Yb) were systematically investigated on their thermoelectric properties. The results indicated that ALiSb Zintl phases possessed intrinsically low lattice thermal conductivity despite the simple structure. In combination of thorough crystallographic and theoretical investigation, rattling-like scattering behavior originating from the Li atoms was suggested. As a result, the pristine ALiSb materials featured decent zT values of 0.4–0.7 at 823 K. With the electrical and thermal transport properties further optimized by configuring the solid solutions such as Sr 0.8 Eu 0.2 LiSb, the material approached a maximum zT up to 1.2 at the same temperature. These breakthroughs are distinct from the previous knowledge that low thermal conductivity in Zintl phases is usually realized through complex crystal structures, and for compounds with simple structures such as the TiNiSi type it is common to have poor thermoelectric performance. Owing to such a rattling-like scattering behavior, now light-element containing Zintl phases can be a promising resource for thermoelectric considerations as well. The mechanism is surely interesting and worth of in-depth investigation.
研究领域:
材料科学
·
热电材料
·
固体化学
·
晶体学
·
能源材料
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 12
·3569-3576
·
IF 5.934
Ran Wang,Guoan Lin,Xiaoxiang Xu
Nitrogen doping has been frequently adopted as a useful strategy to endow wide band gap semiconductors with visible light photocatalytic activities. Nevertheless, factors that may influence the effects of nitrogen doping are seldom touched. In this work, we synthesized a series of complex perovskites Sr3BNb2O9 (B = Mg, Ca and Sr) and applied nitrogen doping strategies to these compounds. Our results suggest that a wealth of important parameters such as structural distortions, cation ordering, nitrogen uptake, visible light absorption and surface hydrophilicity are all strongly correlated with cations in the B site. Accommodating large Sr cations in the B site helps to reduce structural distortions and the level of cation ordering. It is also helpful to increase nitrogen uptake, visible light absorption and surface hydrophilicity, all of which seem to be responsible for a much higher photocatalytic activity for water oxidation reactions. The strong correlations between B site cations and the aforementioned parameters open a new avenue for the design and development of efficient photocatalytic properties of these promising materials.
研究领域:
材料化学
·
光催化
·
无机功能材料
·
能源化学
·
半导体物理
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DOI
高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Guoliang Liu,Xuejiao Zhao,Lihan Zhang,Xiaoqi Wang,Manling Sui,Pengfei Yan
Layered O3–NaNi1/3Fe1/3Mn1/3O2 (NMF) is a promising cathode material for commercialization of sodium-ion batteries (SIBs), but it still faces challenges due to its poor cycling stability and air instability. Herein, we demonstrate that through optimized synthesis conditions (sintering and composition), a single Ca-dopant additive can synergistically achieve bulk-doping and surface-modification effects. Microscopic characterizations reveal that a robust rock-salt structure is constructed on the non-(003) surface facets due to Ca surface enrichment, which is developed through the Ca dopant exsolution process during high-temperature sintering. Combining bulk-doping and surface-modification effects, the 3% Ca-doped NFM cathode demonstrates superb cycling stability and improved rate capability, boosting the capacity retention from 61.4% to 90.5% after 200 cycles at 2.0–4.0 V. Further microanalysis reveals that the surface Ca-enriched modification layer not only effectively suppresses the cycling-induced surface degradation but also significantly improves the air storage stability by acting as a physical barrier layer to prevent moisture degradation. This work offers a new pathway to achieve bulk and surface modifications by a simple doping strategy and reveals the dual effects of Ca-doping for enhanced performance of O3-type layered oxide cathodes.
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Hao-Kai Lou,Peng-Fei Qian,Ze-Long Bao,Zhi-Liang Liu,Cheng-Yu Liu,Yu-Long Guo,Tian-Li Wang,Chun-Hao Chang,Wen-Hao Geng,Hong-Zhang Geng
Flexible and transparent conductive films are extensively employed in window defogging, wearable physiotherapy devices, transparent electrodes, electromagnetic interference shielding, flexible displays, etc. Though silver nanowires (AgNWs) and low-dimensional carbons (e.g., CNTs) and Ti₃C₂Tₓ MXene accelerate field development, persistent challenges such as CNTs dispersion instability and AgNWs oxidation susceptibility limit practical implementation. This study designed a multilayer composite film on PET: a cross-network conductive layer of AgNWs and citric acid-modified single-walled carbon nanotubes (CA-SWCNTs), encapsulated by an aluminum-doped zinc oxide (AZO) protective layer via sol-gel method. AgNWs with high aspect ratio (average diameter 74 nm, length 53 μm) were synthesized by polyol method as the conductive backbone. CA-SWCNTs enhanced hydrophilicity and interfacial bonding, forming a stable conductive/thermal network. By suppressing oxidation and reflection, the AZO encapsulation layer increased the transmittance at 550 nm from 81.3 % to 82.1 % while maintaining a low sheet resistance of 5.4 Ω/sq. The composite films delivered an EMI shielding efficiency of 28.9 dB (8.2 GHz), achieved rapid Joule heating to 120 °C within 90 s at 7 V, demonstrated robust stability over 5500 s of cyclic operation, and exhibited environmental endurance with merely 19.9 % sheet resistance increase after 480 h air exposure as well as a 22.1 % increase after 100 cycles of tape peeling tests. This work provides an innovative strategy for multifunctional flexible transparent devices.
研究领域:
材料科学
·
纳米技术
·
柔性电子学
·
电磁干扰屏蔽
·
能量转换与热管理
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 328
·期 3
·1019-1032
·
IF 1.371
Wang Yugang,Zhang Weimin,Chen Jiahong,Guo Yadan
A new type of Ca/Fe-phosphate composite CFP(CN) was prepared by a sol–gel method. The effects of pH, reaction time, initial uranium concentration, reaction temperature, and Mn(II) selective adsorption were investigated by static batch experiments. The adsorption process of CFP(CN) on U(VI) was in line with the quasi-second-order kinetic model and the Langmuir adsorption isotherm model. The results of thermodynamic analysis show that the adsorption of U(VI) by CFP(CN) is a spontaneous process with heat absorption and entropy increase. The adsorption mechanism of U(VI) on CFP(CN) was investigated by SEM, XRD and FT-IR.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Yongjun Sun,Shengbao Zhou,Wenquan Sun,Sichen Zhu,Huaili Zheng
In order to effectively remove the dissolved heavy metals and the heavy metals on the colloidal particles during the flocculation process, a novel dual-functional chitosan flocculant CMCTS-g-P(AM-CA) is prepared by ultraviolet light-initiated graft polymerization using CMCTS, AM, and ammonium dithiocarbamate. The main influencing factors of monomer concentration, monomer ratio, pH value, photoinitiator concentration, and illumination time are investigated on the basis of intrinsic viscosity, grafting rate, and grafting efficiency of CMCTS-g-P(AM-CA). Characterization results provided empirical evidence for existence of chelating groups. In addition, CMCTS-g-P(AM-CA) was applied to treat the simulated heavy metals and electroplating wastewater. The effect of CMCTS-g-P(AM-CA) dosage, pH value, and reaction G value on flocculation efficiency was also explored. After the two-stage flocculation, the residual concentration of Ni(II), COD, and turbidity of actual electroplating wastewater decreased to 0.96 mg/L, 93.00 mg/L, and 1.71 NTU after flocculation tests at optimal condition, respectively. Finally, the “3E” triangular evaluation model is established and applied to evaluate the flocculation performance of CMCTS-g-P(AM-CA) on the actual heavy metal wastewater further, thereby proving its excellent chelation flocculation performance.
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 4
·6375-6388
·
IF 4.223
Ahmad Khalil,Shah Izaz Ali,Ali Sharafat,Khan Muhammad Tariq,Qureshi Muhammad Bilal Ahmed,Shah Syed Hassan Ali,Ali Asmat,Rashid Wajid,Gul Hifza Nayab
Ferric hydrate has been extensively applied for the removal of various types of pollutants from wastewater because of its low cost and high efficiency. However, its wide-scale application has been greatly restricted by high-dose and low-adsorption capacity. Therefore, a novel Ca-doped ferrihydrite adsorbent has been synthesized and used for the enhanced removal of fluoride from wastewater in the presence of other co-existing ions. At 5 mg/L initial fluoride concentration and pH 5, the removal efficiency of fluoride approached to 97.5% and remained stable. Similarly, with the increase of dose from 100 to 300 mg/L, the fluoride removal linearly increased to 98% and remained plateau at neutral pH. Also, the presence of co-existing ions such as NO 3 − , SO 4 2− , Cl − , and natural organic matter has not significantly influenced the removal performance of the adsorbent. Fluoride removal best fit the pseudo-second-order reaction kinetics and Langmuir isotherm model. The prepared adsorbent exhibited a maximum adsorption capacity of 53.21 mg/g for fluoride uptake from water. The SEM-EDX confirmed the doping of Ca onto the ferrihydrite where the elemental peaks of Ca and Fe emerged at the energy value of about 3.6 Kev and 7.1 Kev respectively in EDX analysis. In addition, SEM results of Ca-doped ferrihydrite adsorbent illustrated that a large microplates type of products was acquired after synthesis. The regeneration results confirmed that adsorbent could retain their original adsorption capacity after five regeneration cycles. The current study suggested that Ca-doped ferrihydrite has the application potential for the enhanced adsorption of fluoride from the water phase. Graphical abstract
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DOI
PubMed
高影响因子
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