APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 11
·1-10
·
IF 2.983
Cui Yongbao,Yan Tianxiang,Wang Zhaohui,Sun Haochen,Lei Xiuyun,Yan Shiguang,Fang Liang,Liu Laijun
(1 − x )K 0.5 Na 0.5 NbO 3 – x La(Zn 0.5 Zr 0.5 )O 3 [(1 − x )KNN– x LZZ, x = 0.005, 0.010, 0.015, 0.020] ceramics were synthesized to fulfill the application requirement of high-temperature ceramic capacitors. The influence of LZZ content on the phase structure, microstructure morphology, dielectric and conductivity behaviors of this system was conducted. An orthorhombic phase for 0.005 ≤ x ≤ 0.010 and an orthorhombic-tetragonal coexisting phase for 0.015 ≤ x ≤ 0.020 were determined by the X-ray diffraction, Rietveld refinement, and dielectric spectra. The ceramic with x = 0.015 exhibits an ultrahigh and stable permittivity ( ε' ~ 1892, ± 15% variation) and a low dielectric loss (tan δ ≤ 0.05) in a wide temperature region of 82–382 °C owing to the composition heterogeneity-induced shoulder-like peak and diffuse phase transition from tetragonal to cubic. The activation energies from the high-temperature dielectric relaxation and conductivity behaviors initially enhance greatly and then increase slowly, which could be related to the synergy effect of decreased oxygen vacancies and microstructure morphology evolution.
研究领域:
材料科学
·
电子工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Fenglai Mo,Zihan Su,Boxun Liu,Lingyu Wan,Yongsheng Li,Jiayu Li,Xinli Liu,Guanlin Liu,Devki N. Talwar,Huilu Yao,Xiaolong Hu,Zhiyuan Zhou
We have synthesized a ceramic sample 0.85Pb(Sc0.5Ta0.5)O 3 -0.15PbTiO 3 [0.85PST-0.15PT] of perovskite structure by using a conventional solid-state reaction method. Systematic impact of annealing time (AT) is studied methodically for comprehending the ferroelectric and dielectric properties, as well as electrocaloric effect and energy harvesting performance. After 40 h of AT and using the electric field of 40 kV/cm on 0.85PST-0.15PT, we have achieved maximum ferroelectric polarization (P = 46.9 μC/cm 2 ), energy capture performance (W = 0.542 J/cm 3 ), and large positive electrocaloric effect (ΔT ∼ 1.63 K and ΔS ∼ 1.23 J/(K.kg)). Additionally, we also achieved high dielectric constant (ε = 23,350) and low dielectric loss (tanδ = 0.039) at the frequency of 1 Hz. As compared to an unannealed situation, the results on ceramic sample with 40 h of AT have revealed increase in P, ε, ΔT, ΔS, and W by 36%, 27%, 37%, 12% and 14%, respectively. Optimal values of AT differed radically for achieving the highest performance in each category. The best performance of energy storage (W energy ∼ 0.638 J/cm 3 ) and energy loss (W loss ∼ 0.498 J/cm 3 ) densities are achieved with the AT of 30 h. The performance of 0.85PST-0.15PT sample increased gradually with the increase of AT until it attained the highest value and then decreased by further increasing AT – exhibiting a peak distribution. Our investigations have provided valuable insights of optimizing the performance of 0.85PST-0.15PT ceramic system through annealing.
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CHINESE SCIENCE BULLETIN
·
2010
·Vol. 55
·期 35
·4018-4025
·
IF 0.917
Wang XiaoPeng,Tong ShengRui,Ge MaoFa,Wang WeiGang,Wang DianXun
The electronic structures of six mono-terpenoids and two of their oxygenated derivatives were studied by He I photoelectron spectroscopy (PES). The observed bands were interpreted on the basis of empirical arguments and theoretical calculations. The first vertical ionization potentials for β -pinene, α -terpinene, terpinolene, γ -terpinene, limonene, myrcene, citral, and terpinene-4-ol were determined to be 8.73, 7.57, 8.26, 8.30, 8.53, 8.68, 8.71, and 8.77 eV, respectively. Most of these values have not been determined by PES before. The correlations of the first vertical ionization potentials of these compounds to the natural logarithms of rate constants for their reactions with the radicals OH, NO 3 , and O 3 were determined. The correlation coefficients for their reactions with OH, NO 3 , and O 3 were 0.97, 0.91, and 0.95, respectively. This method is a powerful technique for predicting the rate constants for the atmospheric oxidation reactions of terpenoids.
研究领域:
物理化学
·
大气化学
·
环境科学
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高影响因子
MATERIALS LETTERS
·
2026
·
IF 2.6
Yi Xu,Jian Zhou,Xiaozhi Wang,Chenchen He,Zemin Yu,Jiayi Du,Xiaoyong Wei,Yujun Feng,Zhuo Xu,Ran Xu
The phase transition behavior of Pb(Hf 1- x Ti x )O 3 (PHT) ceramics with low Ti content (x = 0.02–0.06) was systematically investigated. Results reveal that increasing Ti content induces the transition from the antiferroelectric (AFE) to the ferroelectric (FE) phase, with the phase boundary located near x = 0.05 (95/5 composition). For PHT 98/2, a dielectric anomaly at 125 °C corresponds to an AFE I → AFE II transition. In PHT 96/4, a high-temperature ferroelectric phase was identified, with a sequential phase evolution of AFE → FE → PE upon heating. PHT 95/5 exhibits clear ferroelectric behavior but retains a partial AFE component, resulting in a non-monotonic temperature dependence of remnant polarization ( P r ). These findings suggest that the AFE/FE phase boundary in the PHT system lies near 95/5 and that its phase transition characteristics closely resemble those observed in Pb(Zr 1- x Ti x )O 3 (PZT)-based materials.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Sheng-Guo Lu,Xiongwei Lin,Jiang Li,Dandan Li,Yingbang Yao,Tao Tao,Bo Liang
The electrocaloric effect (ECE) in lead-free (Ba 1−x Sr x )(Sn 0.05 Ti 0.95 )O 3 (BSSnT) (x = 0.05, 0.10, 0.15, 0.20) ceramics were investigated around room temperature using direct and indirect approaches. Results indicate that the maximum ECE occurs near the Curie temperature and slightly shifts towards high temperatures with the increasing applied electric field. The directly measured ECE is larger than that calculated using the Maxwell relation. The maximum electrocaloric strength ΔT/ΔE = 0.52 × 10 −6 K m/V was obtained at T = 36 °C, with an adiabatic ΔT of 1.05 °C at 2 MV m −1 . An analytic formula of electrocaloric strength (dT/dE) was deduced, via which the maximum dT/dE was estimated. The factors affecting the electrocaloric strength were discussed, and the experimental results were compared with those derived from the formula.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 15
·118583
·
IF 6.3
Qinghu Guo,Ting Wang,Jinglong Fan,Yimang Zhao,Xiangyu Meng,Xiaoyi Gao,Zhonghua Yao,Weiping Gong,Hanxing Liu,Hua Hao,Shujun Zhang
Electrostrictive ceramics are crucial for high-precision actuators due to their low hysteresis, fast response, and low heat dissipation. In this work, Nd 3+ was strategically employed to optimize the electrostrictive properties of x Nd-doped Pb(Ni 1/3 Nb 2/3 )O 3 -PbZrO 3 -PbTiO 3 (PNN-PZ-PT) ceramics. A phase transition from the morphotropic phase boundary to a cubic structure, accompanied by enhanced dielectric relaxor behavior was observed with increasing Nd content, which can be attributed to the disruption of long-range ordered ferroelectric domains caused by aliovalent Nd doping-induced local structural heterogeneities—thereby reducing strain hysteresis and enabling improved electrostrictive response. Notably, outstanding electrostrictive strain of 0.105% and high electrostrictive coefficient M 33 = 10.5 × 10 −16 m 2 /V 2 were obtained under a 10 kV/cm for the 3%Nd-doped PNN-PZ-PT ceramic, superior to other relaxor ferroelectric ceramics. Additionally, this composition exhibits outstanding cycling reliability with only 5% strain degradation over 10 6 electrical cycles, positioning it as a promising candidate for precision micro-actuators applications requiring ultra-stable, high-efficiency electromechanical responses.
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高影响因子
ADVANCED MATERIALS
·
2026
·
IF 29.1
Tiandu Sheng,Jian Li,Lihua Wang,Haiying Nie,Shili Gan,Yun Zheng,Jiujun Zhang,Tingliang Xie
The irreversible O3-P3 phase transition in layered sodium oxide cathodes leads to severe volumetric strain and capacity fading. While recent progress via high-entropy design or dual-phase structuring has improved structural stability, these strategies primarily focus on suppressing rather than guiding the phase transition pathway. Herein, we propose an “intermediate phase engineering” concept in a high-entropy O3-type cathode, Na 0.9 Ni 0.32 Zn 0.08 Co 0.1 Fe 0.1 Mn 0.3 Ti 0.1 O 2 (Na9NZCFMT), which enables the spontaneous formation of a strain-buffering OP2 intermediate phase at 3.8 V. Unlike conventional approaches that suppress phase transitions, the OP2 phase acts as a structural buffer that actively guides oxygen-layer gliding along an ordered, low-strain pathway, reducing the volumetric strain from 6.86% to 3.12%. Through integrated in situ XRD, XAS, STEM, and DFT calculations, we unravel the formation condition and buffering mechanism of this OP2 phase: The local coordination environment modulated by specific elements lowers the energy barrier for its formation, leading to a thermodynamically favored and kinetically accessible intermediate state. The cathode exhibits highly reversible structural evolution and anionic redox, delivering 91.5% capacity retention after 100 cycles. This work offers a generalizable strategy for designing stable high-voltage layered cathodes.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Siyue Wei,Xue Chen,Guangzhi Dong,Laijun Liu,Qi Zhang,Biaolin Peng
Ferroelectric ceramic with a large electrocaloric ( EC ) effect at a very low electric field is very attractive in the next solid state refrigeration technology. In this work, two Pb(Sc 0.25 In 0.25 Nb 0.25 Ta 0.25 )O 3 (PSINT) medium-entropy ceramics were successfully synthesized by a spark plasma sintering (SPS) technology, including one-step-SPS processed and two-step-SPS processed samples. A large EC effect (△ T ∼ 0.85 K) with a high EC strength (△ T /△ E ∼ 0.021 K cm/kV) around room temperature are obtained at a very low electric field (∼40 kV/cm) in the two-step-SPS processed sample. Moreover, the working temperature range is very broad (∼120 K), which can be responsible for the high relaxation degree of the dielectric peak. It can be believed that the PSINT medium-entropy ceramics can be promising candidates for application in the next-generation EC cooling devices.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yin Xu,Ying Wu,Wei Zhang,Xiaohui Fan,Yan Wang,Hui Zhang
Sucralose (SUC) is ubiquitously present in aquatic ecosystems in many parts of the world, owing to its widespread usage and ineffective elimination in wastewater treatment plants. This study investigated the mineralization of SUC in aqueous solution via UV/O 3 process and found that SUC can be mineralized efficiently. Effect of several operating parameters like solution pH, O 3 concentration, gas flow rate and initial SUC concentration, on TOC removal were explored. Results indicated that the mineralization efficiency of SUC reached almost 90% in 120 min after UV/O 3 treatment at neutral pH. The intensity of hydroxyl radicals generated in sole O 3 and UV/O 3 processes were compared using the fluorescence spectra analysis. Toxicity tests carried out using Daphnia Magna indicated that the UV/O 3 process under the used experimental conditions was much more effective in the detoxification of the SUC solution than sole O 3 process. The presence of inorganic anion like NO 3 − exhibited an enhancement on the mineralization rate, while Cl − showed some positive effect at low concentration (1 mM) but inhibited SUC mineralization at higher concentrations (10–200 mM). Finally, the intermediates produced in UV/O 3 process were identified by LC-MS analysis and a possible transformation pathway was briefly discussed.
研究领域:
环境科学
·
水处理工程
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2018
·
IF 3.441
Tao Lu,Ying Chen,Min Liu,Wenju Jiang
In this study, a batch experiment was used to investigate the degradation of real evaporative condensing liquid of shale gas wastewater (ECLSGW). We showed that compared to the O 3 , ultraviolet (UV), UV/TiO 2 , and O 3 /UV/TiO 2 processes, the O 3 /UV process has better performance in removing the chemical oxygen demand (COD) and total organic carbon (TOC) of ECLSGW under the same conditions. The effects of initial pH (3–12), ozone flow rate (0.1–0.5 L/min), UV power (15–50 W), and reaction time (0–60 min) on the degradation of ECLSGW via the O 3 /UV process were investigated using a single-factor experiment. Moreover, the optimal experimental conditions were obtained using a quadratic polynomial prediction model (R Adj 2 =0.9961) that was obtained from the central composite design (CCD) of the response surface methodology (RSM). Under optimal experimental conditions, the COD and TOC removal efficiency reached 93.12 and 95.5%, respectively. In addition, gas chromatography–mass spectrometry analysis showed that the O 3 /UV process could nearly completely mineralize organic pollutants in the ECLSGW. Hydrogen peroxide (H 2 O 2 ) and hydroxyl radical ( OH) were identified by manganese dioxide (MnO 2 ) and tert-butanol (TBA). The mechanism research showed that OH plays an important role in the degradation of organic pollutants. In summary, the O 3 /UV process is an effective method to degrade ECLSGW.
研究领域:
环境科学
·
废水处理
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3312
·
IF 4.6
Hang Li,Yanling Yang,Xing Li,Habib Ullah
Surfactants are increasingly used in systems that come into contact with the human body, such as food, pharmaceuticals, cosmetics and personal hygiene products. Increasing attention is being devoted to the toxic effects of surfactants in various human contact formulations, as well as the removal of residual surfactants. In the presence of ozone (O3), anion surfactants—a characteristic micro-pollutant—such as sodium dodecylbenzene sulfonate (SDBS) in greywater, can be removed using radical advanced oxidation. Herein, we report a systematic study of the SDBS degradation effect of O3activated by vacuum ultraviolet (VUV) irradiation and the influence of water composition on VUV/O3, and determined the contribution of radical species. We show a synergistic effect of VUV and O3, while VUV/O3reached a higher mineralization (50.37%) than that of VUV (10.63%) and O3(29.60%) alone. The main reactive radicals of VUV/O3were HO•. VUV/O3had an optimal pH of 9. The addition of SO42−had almost no effect on the degradation of SDBS by VUV/O3, Cl−and HCO3−slightly reduced the reaction rate, and NO3−had a significant inhibition on the degradation. In total, SDBS had three isomers, with which the three degradation pathways were very comparable. Compared with SDBS, the toxicity and harmfulness of the degradation by-products of the VUV/O3process decreased. Additionally, VUV/O3could degrade synthetic anion surfactants from laundry greywater effectively. Overall, the results show the potential of VUV/O3in safeguarding humans from residual surfactant hazards.Keywords:ozone;surfactants;toxicological analysis;vacuum ultraviolet
研究领域:
环境科学
·
化学工程
·
毒理学
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PubMed
高影响因子
Carbon Energy
·
2024
·Vol. 7
·期 1
·e627
·
IF 19.5
Yingcong Liu,Xing Zhou,Dongwei He,Xiaowei Liu,Chao Yang,Dawei Xu,Meilong Wang,Ruitao Sun,Bin Zhang,Jingjing Xie,Jin Han,Wen Chen,Ya You
The O3-type layered cathode with high Ni content has attracted much attention because of its high capacity and simple synthesis process. However, surface side reaction and O3–P3 phase transitions would occur during Na + insertion/extraction, resulting in unsatisfying electrochemical performance. Herein, O3-Na[Ni 0.6 Co 0.2 Mn 0.2 ]O 2 (NNCM622) cathode is modified by a NaTiO x coating layer in a wet chemistry method, which reduces the parasitic reaction and facilitates Na + migration. Simultaneously, the partially doped Ti improves structural stability by restraining the irreversible multiple-phase transition. As a result, the modified NNCM622 cathode obtains a high specific capacity of 143.4 mAh g −1 and an improved capacity retention of 69% after 300 cycles. Our work offers new prospects for stabilizing the NNCM622 cathode with a feasible coating strategy.
研究领域:
材料科学
·
电化学
·
储能
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高影响因子
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