JOURNAL OF ALLOYS AND COMPOUNDS
·
2013
·
IF 2.39
Liangliang Li,Yongfei Liu,Xiaoying Qin,Di Li,Jian Zhang,Chunjun Song,Ling Wang
Highly dense and fine-grained (Sr 1− x Gd x )TiO 3− δ ceramics ( x = 0.05–0.12) were fabricated by a sol–gel process plus spark plasma sintering, and their thermoelectric properties were investigated from ∼300 K to 1100 K. The results show that the electrical resistivity of the (Sr 1− x Gd x )TiO 3− δ ceramics decreases greatly while maintaining large absolute value of the Seebeck coefficient | S | upon Gd doping. As a result, a large power factor ( PF ) greater than 10 μW cm −1 K −2 is obtained in (Sr 0.9 Gd 0.1 )TiO 3− δ in the temperature range from 400 K to 1000 K, and peak PF reaches 16 μW cm −1 K −2 at ∼570 K. Simultaneously, the lattice thermal conductivity κ L reduces remarkably (e.g. κ L decreases from 2.7 to 2.13 W m −1 K −1 at ∼1000 K). Owing to the large PF and low κ L , a record value of figure of merit ZT = 0.37 is achieved at 1006 K for (Sr 0.9 Gd 0.1 )TiO 3− δ , indicating that appropriate combinations of fine-grained microstructure with both high densities and proper doping as well as oxygen deficiency are essential to the effective enhancement of thermoelectric performance of STO-based ceramics.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Lingwei Lu,Meilin Lv,Gang Liu,Xiaoxiang Xu
Constituting solid solutions has been an appealing means to gain control over various physicochemical properties. In this work, we synthesized a series of SrTiO 3 -BiFeO 3 solid solutions and systematically explored their structural, optical and photocatalytic properties. Our results show that all solid solutions crystallize in a primitive cubic structure and their band gap values can be easily tuned by adjusting molar ratios between SrTiO 3 and BiFeO 3 . Photocatalytic hydrogen production under both full range and visible light irradiation is greatly improved after forming solid solutions. The highest hydrogen production rate obtained is ∼180 μmol/h under full range irradiation (λ ≥ 250 nm) and ∼4.2 μmol/h under visible light irradiation (λ ≥ 400 nm), corresponding to apparent quantum efficiency ∼2.28% and ∼0.10%, respectively. The activity is found to be strongly influenced by surface area and light absorption. Theoretical calculation suggests that Fe contributes to the formation of spin-polarized bands in the middle of original band gap and is responsible for the band gap reduction and visible light photocatalytic activity .
研究领域:
材料化学
·
光催化
·
能源材料
·
无机固体化学
·
半导体物理
·
太阳能转化
·
表面科学
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2020
·Vol. 39
·期 5
·541-547
·
IF 3.104
Yingqi Wang,Wenqi Ma,Yuexin Song,Jingjing Chen,Jiao Xu,Dajian Wang,Zhiyong Mao
In this work, Eu 3+ doped SrTiO 3 powders were synthesized by sol-gel method and the influences of Eu 3+ dopants on the crystalline structure, microstructure morphology, electronic band-gap and photocatalytic performance for degradation of organic pollutant were investigated in detail. Research results reveal that the incorporated Eu 3+ ions in SrTiO 3 lattice are preferable to substitute the Sr 2+ -Ti 4+ ions pair by two Eu 3+ ions. The presence of Eu 3+ ions plays a significant role for the microstructure morphology of the SrTiO 3 powders, leading to the formation of smaller size nanoparticles with a higher specific surface area . The light absorption capability of the resulting materials is improved owing to the narrowing of the band-gap induced by Eu 3+ dopants . As a result, the enhanced photocatalytic activity application for photodegradation of Rhodamine B solution is demonstrated for the SrTiO 3 powders doped with Eu 3+ ions.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境化学
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DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 6
·
IF 3.7
Shaohang Sun,Yize Liu,Chaohao Hu,Yanli Zhang,Yan Zhong,Dianhui Wang
SrTiO3has attracted considerable attention owing to its favorable electronic structure and chemical stability among various semiconductor photocatalysts. However, its practical application is hindered by a wide bandgap and rapid recombination of photogenerated charge carriers. Herein, we report the fabrication of a SrTiO3/carbon quantum dot (CQD) heterojunction via a two-step hydrothermal method for efficient CO2-to-CH4photocatalysis, a strategy that circumvents the need for high-temperature treatment and noble metals. TEM images revealed well-defined lattice fringes and intimate interfacial contact between SrTiO3and CQDs, suggesting efficient charge transfer pathways. Optical measurements confirmed that CQD modification extends the visible-light absorption range of SrTiO3to 420 nm while significantly enhancing charge separation efficiency. The SrTiO3/CQDs composite with 10 wt% CQD loading exhibited optimal activity, achieving a CH4evolution rate of 1.16 μmol·g−1·h−1—16.3 times higher than that of pristine SrTiO3. Mechanistic investigations demonstrate that CQDs serve as efficient electron reservoirs, facilitating interfacial charge transfer and suppressing the recombination of photogenerated charge carriers. The catalyst maintained stable performance over four consecutive cycles, confirming its structural robustness and reusability. This work demonstrates that CQD modification effectively enhances the visible-light response and charge separation efficiency of SrTiO3, offering a viable strategy for designing high-performance photocatalysts toward solar fuel production.
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DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2026
·Vol. 132
·期 8
·722
·
IF 3
Song Zhe,Xiao Chunyan,Gao Qixuan,Ma Haoyi,Yue Xiting,Lu Jiatian,Jiang Ming
Peroxymonosulfate (PMS)-assisted photocatalytic degradation represents an efficient advanced oxidation process for water purification. In this study, a novel SrTiO₃/Cu₂SnS₃ heterojunction was synthesized via a hydrothermal method, which was employed for visible-light-driven PMS activation to degrade norfloxacin (NOR). The STO/CTS-2 (n SrTiO₃ /n Cu₂SnS₃ = 2) composite exhibited superior catalytic performance, achieving 92.65% NOR degradation within 60 min, attributed to enhanced charge separation and efficient PMS activation. Comprehensive characterization confirmed the heterostructure formation, optimized band alignment, and improved light absorption. Radical trapping experiments revealed that superoxide radicals (•O₂⁻) dominated the degradation process, with additional contributions from SO 4 •⁻ , •OH, 1 O 2 , and h⁺. A plausible NOR degradation pathway and the underlying PMS activation mechanism were proposed. This study provides new insights into visible-light-driven PMS activation and presents an effective strategy for antibiotic wastewater treatment.
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产品关联
DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 18
·3914
·
IF 3.7
Yanlong Gao,Hongfei Wu,Senwei Wu,Xinhong Chu,Xiujian Zhao,Gopinathan Sankar,Shouqin Tian
The photocatalytic decomposition of methylene blue (MB) from textile wastewater is promising, though many photocatalysts suffer from a wide band gap, unspecific catalytic active sites and inefficient charge carrier separation. Here, a series of SrTiO3-based catalysts modified with highly dispersed nickel species were synthesized via a facile annealing process in a NH3atmosphere obtained from the decomposition of ammonium bicarbonate. The loading amount of nickel is precisely regulated by controlling the concentration of a nickel nitrate hexahydrate solution. The sample containing 0.5 wt% Ni showed a complete degradation of MB under the irradiation of a xenon lamp for 75 min, exhibiting the best performance with an apparent reaction rate constant (k) 3.2 times higher than that of pure SrTiO3. The enhancement in photocatalytic performance can probably be attributed to the strong metal–support interaction between the highly dispersed Ni species and SrTiO3, which can modulate the band structure by adjusting the concentration of oxygen vacancies, suppress charge recombination, and thus promote efficient carrier separation. Furthermore, the highly dispersed Ni species appears to enhance the adsorption and activation of the reactants on the catalytic surface. This work demonstrates the potential of SrTiO3as a support for a range of highly dispersed catalysts with active metal species that can provide new insights and a practical foundation for the rational design of high-performance SrTiO3-based composite photocatalytic materials.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 27
·12317-12324
·
IF 3.5
Lu Ye,Zhang Ji,Zhao Xinyi,Zhou Kedong,He Lei
Ceramic capacitors are receiving increasing interest because of their applications in pulsed-power devices. The perovskite oxide Bi 0.5 Na 0.5 TiO 3 (BNT)-based ferroelectric ceramics are regarded as prospective lead-free candidate for dielectric capacitors because of the high polarization and outstanding relaxor behaviour. Herein, the relaxor ferroelectric (0.7− x )Bi 0.5 Na 0.5 TiO 3 –0.3SrTiO 3 – x Ca 0.7 Sm 0.2 TiO 3 ceramics synthesized through solid-state route and exhibited pseudocubic perovskite structure and strong relaxor behaviour. With increasing Ca 0.7 Sm 0.2 TiO 3 content, the moderate permittivity and reduced grain size contributed to the monotonically increased electric breakdown strength. Among prepared samples, the x = 0.2 ceramic displayed slimmer polarization-electric field curves with a remarkable recoverable energy density (~6.8 J/cm 3 ) and a satisfied efficiency (~82.2%) under external electric field of 450 kV/cm. Moreover, the x = 0.2 ceramic also exhibited a superb thermal reliability of energy storage properties (3.9–4.5 J/cm 3 with variation of 13.3% in 25–160 °C) resulting from the diffuse phase transition. The above results make the x = 0.2 ceramics becoming promising candidates for pulsed-power devices.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2026
·
IF 4.7
Qinghu Guo,Ting Wang,Mengchen Yao,Shangshu Li,Yiren Liu,Weiping Gong,Hua Hao
The demand for advanced microwave dielectric ceramics for 5G base station filters drives the need for materials combining moderate permittivity, high quality factor (Q × f), and near-zero temperature stability (τf). This work investigates Ga2O3-doped SrTiO3–NdAlO3 (ST-NA) ceramics. The optimal base composition (0.5ST-0.5NA) achieves εr = 40.2, Q × f = 12,729 GHz, τf = 5.89 ppm/°C. To further enhance the microwave dielectric performance, Ga2O3 doping was introduced into the ST-NA ceramics. The substitution of Ga3+ for Ti4+ not only induces associated oxygen vacancy formation but also effectively suppressed the reduction of Ti4+ to Ti3+ during sintering, thereby reducing conduction loss, while the dielectric constant remained relatively stable. Consequently, 1.5% Ga2O3-doped ST-NA ceramic exhibited excellent overall microwave dielectric properties, with εr = 40.7, Q × f = 21,441 GHz, τf = 1.78 ppm/°C. These results demonstrate that Ga2O3-doped ST-NA ceramics are promising candidates for temperature-stable, low-loss microwave components in 5G and other high-frequency communication systems.
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS-CONDENSED MATTER
·
2016
·Vol. 28
·期 47
·475501
·
IF 2.209
LiDong Dai,Lei Wu,HePing Li,HaiYing Hu,YuKai Zhuang,KaiXiang Liu
The electrical transport properties of undoped and yttrium-doped strontium titanate (Sr(Ti1 – xYx)O3 – δ, x = 0, 0.02) under high pressure were investigated with in situ impedance spectroscopy measurements. A pressure-induced conductivity switching for undoped and 2 mole% Y-doped strontium titanate is observed at around ~10.0 and 7.0 GPa respectively, which are caused by a cubic to tetragonal I4/mcm phase transition. The decrease of the phase transition point of 2 mole% Y-doped strontium titanate can be attributed to larger Y3+ atoms occupying the B-site and the creation of more oxygen vacancies, which lead to octahedra tilting and symmetry breaking. The results of the voltage-bias dependence of grain-boundary impedance of undoped and 2 mole% Y-doped strontium titanate at different pressures revealed that Schottky-type potential barriers formed at grain boundaries are the key factor for the accumulation of oxygen vacancy at the interface under pressure.
研究领域:
材料科学
·
凝聚态物理
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Weijie Zhao,Jing Zhang,Jiaqi Pan,Wenhui Zhao,Jiantao Niu,Jianfeng Qiu,Chaorong Li
The 1D Ag 3 PO 4 sensitized SrTiO 3 nanowires are prepared by simple route of electrospinning-in situ deposition technique. The results of the thermogravimetry (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive Spectrometer (EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–Visible diffuse reflectance spectroscopy (UV–Vis) indicate that the Ag 3 PO 4 nanoparticles has been deposited on the surface of the SrTiO 3 nanowires successfully. Experimental results showed that compared with pure SrTiO 3 , the as-prepared 1D Ag 3 PO 4 sensitized SrTiO 3 nanowires exhibit obvious enhancement of photocatalytic performance and stability. Especially, the Ag 3 PO 4 /SrTiO 3 (3AS sample) had a satisfactory photocatalytic activity for degrading methylene blue (MB) more than 98% under visible light irradiation. As to pure SrTiO 3 and Ag 3 PO 4 , only 9.8% and 49% of MB was decomposed after 35 min irradiation respectively. Furthermore, the mechanism of the enhancing photocatalytic activity could be ascribed to the nano-heterojunction of the Ag 3 PO 4 /SrTiO 3 , the visible light response of the Ag 3 PO 4 , and the 1D structure of the nanowires.
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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 4
·2350-2359
·
IF 2.1
Ying Lu,Peng Li,Juan Du,Chengchao Hu,Jigong Hao,Kunyu Zhao,Huarong Zeng,Wei Li
(1 − x )Bi 0.5 Na 0.47 Li 0.03 Ti 0.99 Sn 0.01 O 3 – x SrTiO 3 (BNLST– x ST) lead-free ceramics were synthesized by traditional solid phase sintering. When x = 0.4, the ceramic achieves a high energy storage density W rec of 3.78 J/cm 3 as well as a superior efficiency η of 90.3% under 360 kV/cm. The charge–discharge curves related to temperature and cycle show that the 0.6BNLST–0.4ST sample has good temperature stability (20–180°C) and cycling reliability (variation of W D < 5%). Moreover, a fast discharge rate ( t 0.9 = 0.219 μs) and a large discharge energy density ( W D = 1.89 J/cm 3 ) are achieved at 220 kV/cm. The results show that BNLST– x ST energy storage ceramics are promising materials for devices with pulsed power capacitor.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2021
·Vol. 40
·期 5
·1077-1085
·
IF 4.003
Song Yue-Xin,Ma Wen-Qi,Chen Jing-Jing,Xu Jiao,Mao Zhi-Yong,Wang Da-Jian
In this work, 15 types of rare earth (Re) ions, including Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ and Lu 3+ doped perovskite SrTiO 3 powders were synthesized by sol–gel method. The influence of Re ions doping on the crystal structure, morphology and optical property as well as the photocatalytic activity for the photodegradation of rhodamine B (RhB) was investigated in detail when the synthesized Re ions doped SrTiO 3 powders were served as catalysts. The presented results revealed that the crystal structure is invariable, whereas the morphology and the optical bandgap are variable for the resultant SrTiO 3 powders when different Re ions were incorporated into the SrTiO 3 lattice. The relatedness between the morphology, optical property and photocatalytic activity of the synthesized SrTiO 3 catalysts doped with variable Re ions were analyzed deeply, providing an insight into the influence factors on the photocatalytic activity of catalysts. Graphic abstract
研究领域:
材料化学
·
光催化
·
无机功能材料
·
环境催化
·
纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）