JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Yong Zhou,Jiamei Liu,Xudong Zhao,Bin Yang,Bing Li,Xiaoyang Liu
Because of their unique electrical and magnetic properties, the perovskite multiferroic materials exhibit significant potential in spintronic device applications. However, synthesizing room-temperature multiferroic materials with robust magneto-electric coupling effects remains a major challenge. In this work, Yb 3 + , with an ionic radius slightly smaller than Y 3+ , was selected for A -site doping in the h -YMnO 3 , which has a high ferroelectric transition temperature (T C ∼ 900 K) and a low antiferromagnetic transition temperature (T N ≤ 70 K). This similar ionic radius allows Yb to substitute the Y site effectively while introducing distinct electronic states, thereby optimizing the structure and multiferroic properties of h -YMnO 3 without significantly altering the crystal structure. A series of Yb-doped Y 1- x Yb x MnO 3 ( x = 0, 0.1, 0.2, 0.3, 0.4, 0.5 and 1) materials were synthesized via conventional solid-phase reaction. The effects of Yb doping on the structure, magnetism, and ferroelectricity of h -YMnO 3 were studied. X-ray diffraction (XRD) and corresponding XRD refining results show that as Y 3+ is replaced by Yb 3+ with smaller radii, the cell parameters and cell volume of Y 1- x Yb x MnO 3 decrease, the cell is compressed, and the lattice structure of Y 0.5 Yb 0.5 MnO 3 obtained under the condition of Yb semi-doping changes significantly. Subsequent magnetic and room-temperature ferroelectric test results show that the Y 1- x Yb x MnO 3 series samples have anti-ferromagnetic ground states. In particular, the proper inclination of Mn 3+ ions in the double perovskite structure of Y 0.5 Yb 0.5 MnO 3 generates strong Dzyaloshinskii-Moriya (DM) interactions, resulting in relatively strong antiferromagnetism. The antiferromagnetic Neel temperature (T N ) from 37 K to 41 K. Yb 3+ -induced inclined ferroelectricity enables Y 0.8 Yb 0.2 MnO 3 to achieve the highest ferroelectric polarization of 0.030 µC cm −2 , which is 180 % greater than that of h -YMnO 3 . The results demonstrate that Yb doping plays a crucial role in regulating the structure and multiferroic properties of h -YMnO 3 , offering a novel strategy for developing room-temperature multiferroic materials with robust magneto-electric coupling.
研究领域:
材料科学
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凝聚态物理
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhanxiang Yin,Zhongyuan Liu,Yuan Yu,Cunyin Zhang,Peng Chen,Jianxun Zhao,Pan He,Xin Guo
Polycrystalline BiCuSeO is considered as a promising thermoelectric material due to its intrinsically low thermal conductivity and moderate Seebeck coefficient. However, its low electrical conductivity and coupled electron–phonon transport properties restrict the further improvement of the thermoelectric performance. In this work, Pb and Yb dopants are incorporated into BiCuSeO to substitute for Bi sites via ball milling and high-pressure and high-temperature sintering, leading to a synergistic optimization of the electron and phonon transport and improved thermoelectric performance. The carrier concentration exhibits an enhancement with increasing Pb&Yb co-doping contents. Meanwhile, the decreased carrier mobility is suppressed appropriately by coordinating with the interplay of Pb and Yb dopants on the electronic structure. Besides, Pb&Yb co-doping combined with high-pressure and high-temperature sintering introduces abundant grain boundaries, dislocations, and point defects to effectively decrease the lattice thermal conductivity by scattering phonons in a broad frequency range. Coupled with the synergistic optimization of the electrical and thermal properties, a maximum zT of 1.2 is achieved in Bi0.88Pb0.06Yb0.06CuSeO at 850 K, which significantly outperforms the majority of oxygen-containing thermoelectric materials. Our study suggests that dual doping of bivalent ions and rare-earth elements at Bi sites is an effective strategy for improving the thermoelectric performance of BiCuSeO.
研究领域:
材料科学
·
热电材料研究
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2016
·Vol. 3
·期 8
·1082-1090
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IF 4.532
Min Li,Xiaoyang Liu,Li Liu,Bing Ma,Benxian Li,Xudong Zhao,Wenming Tong,Xiaofeng Wang
A series of Yb3+/Tm3+ co-doped β-NaYF4 (β-NaYF4:Yb,Tm) crystals have been successfully synthesized via the molten salt synthesis (MSS) method. A unique strong green emission of Tm3+ was observed, which cannot be obtained by any other method. The red, green and blue (RGB) light emissions have been obtained simultaneously in the presence of a single activator (Tm3+). The influencing factors of crystal growth have been studied in detail, in order to understand the change of the transition probabilities of Tm3+. Subsequent studies indicate that the RGB light emissions of Tm3+ can be effectively tuned by varying the concentration of sensitizers (Yb3+ and Mn2+) and the reaction time. Consequently, the effective multicolor upconversion (UC) luminescence was obtained, especially a strong white light, which was not obtained in the β-NaYF4:Yb,Tm system earlier. To our knowledge, it is the first time that the UC properties in the β-NaYF4:Yb,Tm system have been investigated by altering the transition probabilities at the same energy level of Tm3+.
研究领域:
材料科学
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光学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Jing Wang,Xiaowei Mei,Fan Zhang,Yongsheng Liu,Dong Wang,Jingxin Li,Ning Dong
This study systematically investigates the influence of preparation temperature on microstructure and generation mechanism of Si–Y–B-Yb ceramics as anti-corrosion matrix. Main phases of Si–Y–B-Yb ceramics are Y/YbB 4 , YSi 2 , and Si, where Y/YbB 4 is derived from the reaction between YSi 2 and YbB 6 . With increase in preparation temperature, open porosity of Si–Y–B-Yb ceramics gradually decreases, reaching 0.24 % at 1350 °C, and internal phases transform from a dispersed distribution to clearly defined boundary state. Based on this, high-temperature water-oxygen corrosion behavior of Si–Y–B-Yb ceramics is characterized in 50 vol% H 2 O+50 vol% O 2 environment at 1250 °C for 100 h. In this corrosive environment, silicate phase appears on the surface of Si–Y–B-Yb ceramics. With prolonged corrosion time, silicate phase gradually forms more complete protective layer, hindering further corrosion by water-oxygen environment. These results demonstrate the feasibility of proposed Si–Y–B-Yb materials for corrosion protection.
研究领域:
材料科学
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腐蚀与防护
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DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 12
·125017
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IF 1.449
Hanyu Yao,Honglie Shen,Quntao Tang
In this paper, Mn doped NaYF4:Er,Yb phosphors were successfully synthesized by a simple solvothermal method. According to the results of x-ray diffraction, scanning electron microscopy and photoluminescence measurement, Mn doping had a remarkable effect on the crystal phase, size, and especially upconversion (UC) properties of these phosphors. Under 980 nanometer (nm) laser excitation, the UC luminescence intensity could be enhanced by increasing Mn concentration. Temperature-dependence measurement of the samples from 300–30 K showed two green emission bands (2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions of the Er3+ ion), which meant that the UC phosphors were suitable for temperature sensor by using the fluorescence intensity ratio (FIR) method. The FIR value decreased with temperature, and the experimental data were well fitted with a theoretical function. The higher maximum value of sensitivity (0.0057 K−1) for 20% Mn sample in contrast to that of 0% Mn one (0.0036 K−1) indicated that Mn doped sample had a higher sensitivity for temperature sensing. The results demonstrated that Mn doping would be a good way for optimizing the sensitivity of fluorescence-based temperature sensor.
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
DALTON TRANSACTIONS
·
2017
·Vol. 47
·期 5
·1666-1673
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IF 4.029
Yan Lv,Lin Yue,Qian Li,Baoyi Shao,Sen Zhao,Haitao Wang,Shijia Wu,Zhouping Wang
Herein, the design and synthesis of a multifunctional (Fe3O4-NaYF4:Yb,Tm)@TiO2 photocatalyst through a facile sol–gel process combined with electrostatic self-assembly has been reported. Particularly, as an upconversion sensor, NaYF4:Yb,Tm nanoparticles have the ability to convert near-infrared (NIR) light into ultraviolet (UV) emissions, so that the catalytic body TiO2 can indirectly utilize the NIR part of sunlight but not UV light. The excellent photocatalytic activity of the hybrid samples is evaluated using a model of the degradation of methylene blue (MB). Most importantly, the obtained materials exhibit remarkable magnetic properties because of the addition of a magnetic component (Fe3O4), therefore, the photocatalysts possess desired recyclability and reusability, which is significant for actual applications. Finally, the possible photocatalysis mechanism of the nanohybrids is discussed and hydroxyl radicals (OH˙) are confirmed as the main reactive species.
研究领域:
材料科学
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环境科学
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纳米技术
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DOI
PubMed
高影响因子
Materials Today Communications
·
2024
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IF 3.7
Hao Ren,Shoujun Ding,Yuhang Zheng,Chuancheng Zhang,Miaomiao Wang,Yong Zou,Wenpeng Liu,Lu Cheng
Fluorescence intensity ratio thermometry represents a novel non-contact approach for rapid and precise temperature measurements. In this study, a Yb,Er co-doped Gd 3 Sc 2 Al 3 O 12 single crystal (Yb,Er:GSAG) was investigated, exploiting the dual-mode luminescence of upconversion and downconversion for optical temperature sensing applications. The crystal exhibited distinct luminescence behaviors when subjected to 266 nm, 355 nm, and 980 nm laser excitations , manifesting a dark blue appearance under 266 nm ultraviolet (UV) excitation and a green hue under 355 nm and 980 nm excitations. Specifically, under 355 nm excitation, the crystal demonstrated a predominantly pure green upconversion, with a green-to-red ratio of 38. For the first time, we propose an investigation into the temperature sensing behavior under dual-mode luminescence in the same crystal, utilizing the fluorescence intensity ratio of the 2 H 11/2 and 4 S 3/2 thermally coupled energy levels of Er 3+ . The obtained maximum relative sensitivities ( S R ) for the two fitted luminescence modes were found to be 101.80×10 −4 K −1 at 300 K (980 nm excitation) and 126.39×10 −4 K −1 at 300 K (355 nm excitation), respectively. The impressive S R values substantiate Yb,Er:GSAG crystal as highly promising candidates for optical temperature sensing applications.
研究领域:
光学材料
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物理化学
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温度测量技术
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DOI
高影响因子
Crystals
·
2021
·Vol. 11
·期 11
·1328
·
IF 2.589
Daini Wang,Wenxia Wu,Xiaojun Tan,Bernard A. Goodman,Shoulei Xu,Wen Deng
As a development on previous research on single crystals of Pr3+-doped yttria-stabilized zirconia (YSZ), we report here the preparation and optical properties of Yb/Pr co-doped YSZ single crystals with different Yb2O3concentrations. Results from X-ray diffraction (XRD) and Raman spectroscopy indicated that all of the crystal samples had a cubic phase structure, and transmission was ≥88% in the 550–780 nm range. Photoluminescence (PL) under excitation with a 980 nm laser showed upconversion emission, and several peaks were observed centered on 448 nm, 508 nm, 525 nm, 542 nm, 617 nm and 656 nm. The effects of excited state absorption (ESA), energy transfer upconversion (ETU), cross relaxation (CR), and cooperative energy transfer (CET) on the upconversion luminescence and energy transition mechanism in YSZ crystals were further studied. The fluorescence lifetime of the3P0→3H5transition at 542 nm reached 207 μs, which shows that the samples are of potential use for laser and fluorescence output.Keywords:optical floating zone method;yttria-stabilized zirconia (YSZ) single crystal;Pr/Yb co-doped;upconversion luminescence
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yi Zhang,Chengyu Sun,Yihao Ji,Kaicheng Bi,Haipeng Tian,Bin Wang
Developing the highly efficient adsorbents for improved recovery of rare earth elements from industrial wastewater is significant. Therefore, two defective MIL-101 series, named as MIL-101(Cr)-D and MIL-101(Fe)-D, were fabricated by introducing benzoic acid as the second ligand to coordinate with metal clusters. The controlled samples were characterized by XRD, ATR-IR, TGA, EPR, and BET tests, verifying the presence of oxygen-vacancy sites and the integrity of crystalline structure. In addition, the adsorption kinetics, the adsorption isotherms, the influences of pH and different REE ions on adsorption performance, and the cycling stability of defective and normal MIL-101s were carefully discussed and compared. The results showed that the adsorption capacities of MIL-101(Fe)-D10 and MIL-101(Cr)-D20 were 27.88 and 37.45 mg·g −1 respectively for Yb(III) capture at 30 °C and pH = 6, were much higher than those of the corresponding normal MIL-101. Furthermore, the adsorption mechanisms of two defective MIL-101s have been analyzed by EDS, mapping and XPS, confirming the surface complexation interactions between Yb(III) and O-vacancy sites originated from Cr-O and Fe-O clusters. Meanwhile, the excellent reusability of MIL-101(Cr)-D10 was validated by the successive twelve adsorption recycles and XRD analysis. Hence, this work supplies the feasible and facile strategy for manufacturing the missing-linker defective MOFs, endowing these adsorbents with the enhanced adsorption performance towards Yb(III) from aqueous solution.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 22
·期 3
·944-950
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IF 5.101
Yuan Ren,Min Chen,Linfeng Hu,Xiaosheng Fang,Limin Wu
This paper presents an oil/water interface self-assembly strategy for the fabrication of hydrophobic nanoparticles into mono- and multi-layered nanofilms with NaYF4:Yb,Er nanoplatelets as a prototype. In this approach, hydrophobic β-NaYF4:Yb,Er nanoplatelets dispersed in chloroform solvent are used as the sub-phase, then a certain amount of water is added to produce a chloroform/water interface. When ethanol is added, the up-conversion NaYF4:Yb,Er nanoplatelets are found to readily self-assemble at the oil/water interface into a closely-packed mono- or multi-layer nanofilm with a preferred [001] orientation. Compared with the previous water/oil interface self-assembly strategy, the present method is not only used for fabrication of hydrophobic nanoparticles into high quality nanofilms, but also is environmentally friendly and is safe to the operator.
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 26
·10202-10207
·
IF 4.097
Min Pang,Xuesong Zhai,Jing Feng,Shuyan Song,Ruiping Deng,Zhuo Wang,Shuang Yao,Xin Ge,Hongjie Zhang
Water-soluble hexagonal NaScF4:Yb/Er nanocrystals have been directly synthesized via a facile one-step hydrothermal route. The as-prepared nanocrystals were monodisperse and could form stable colloidal solutions in polar solvents, such as water and ethanol. The novel NaScF4:Yb/Er nanocrystals exhibited intrinsic intense red upconversion emission, in contrast to other lanthanide-doped fluoride nanocrystals. Remarkably, the upconversion emission intensity was enhanced ∼6.8 times through the coating of an active-shell (containing Yb3+) surrounding the NaScF4:Yb/Er core nanocrystals, owing to surface passivation effect and efficient energy transfer from Yb3+ ions in both the core and the shell to Er3+ ions. These water-soluble hexagonal NaScF4:Yb/Er nanocrystals with intense red emission are ideal for a variety of in vitro and in vivo biological imaging applications.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhiquan Chen,Didi Yang,Zhenda Liang,Yongtao Xu,Yijun Pang,Gang Xu,Chaoxiang Chen,Kunyu Ma,Li Zhou,Bing Yan
Microbial pollution and antibiotic contamination can pose a serious threat to human health. The rational development of efficient and low-cost methods is critical to solving these problems. In this study, novel Z-scheme heterojunctions consisting of Yb-MnO 2 and nitrogen-doped carbon quantum dots (N-CQDs) were fabricated to achieve efficient photocatalytic degradation of tetracycline (TC) and the destruction of bacteria ( Escherichia coli used as a model). Results showed that the Yb-doping strategy improves the characteristics of host MnO 2 by weakening the lattice interface and increasing its surface area. Compared with Yb-MnO 2 , Yb-MnO 2 /N-CQDs heterostructures exhibited superior photocatalytic activity in TC degradation under simulated solar light. The remarkable photocatalytic and mild oxidation abilities of Yb-MnO 2 /N-CQDs led to an impressive 97.88% removal rate of TC. Additionally, the structure displayed robust resistance to various ions and broad pH levels. Notably, the Yb-MnO 2 /N-CQDs heterostructures exhibited excellent bactericidal activity, with no observed bacterial resistance even after 20 consecutive trials. Furthermore, quenching experiments demonstrated that 1 O 2 and O 2 − were the primary radicals involved in the Yb-MnO 2 /N-CQDs-based photocatalysis process. The remarkable photocatalytic activity of Yb-MnO 2 /N-CQDs can be attributed to two key factors. Firstly, the large surface area and abundant oxygen defects provide rich active sites for reactant degradation. Secondly, the Z-scheme heterojunctions formed between Yb-MnO 2 and N-CQDs effectively facilitate the separation of photogenerated electron-hole pairs and increase the reduction/oxidation potentials for reactive oxygen species generation. This study presents a promising novel photocatalyst for the facile and energy-saving treatment of antibiotic and microbial pollution, and it may provide new insight into the design of highly efficient heterogeneous photocatalysts.
研究领域:
环境科学
·
材料科学
·
微生物学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）