BULLETIN OF MATERIALS SCIENCE
·
2016
·Vol. 39
·期 1
·187-193
·
IF 0.895
CAO RENPING,QIN ZHENGDONG,JIANG SHENHUA,LIANG AIHUI,LUO ZHIYANG,YU XIAOGUANG
A series of CaNb 2 O 6 : x Sm 3+ (0 ≤
x
≤ 10 mol%) and CaNb 2 O 6 : Sm 3+ , Na + /B 3+ phosphors were synthesized by the solid-state reaction method in air. Their crystal structures and luminescence properties were investigated and analysed, respectively. Host CaNb 2 O 6 emitted blue light with excitation 270 nm. CaNb 2 O 6 : x Sm 3+ phosphors showed a systematically varied hue from blue to white by changing Sm 3+ ion concentration from 0 to 10 mol% with excitation of 270 nm and their chromaticity coordinates were the regions from (0.1665, 0.1767) to (0.2484, 0.2260). Luminescence properties of CaNb 2 O 6 : Sm 3+ phosphor were tuned and improved significantly by codoping B 3+ or Na + ions. Energy transfer between Nb \(_{\mathbf {2}}\textit {O}_{\mathbf {6}}^{\boldsymbol {2-}}\) group and Sm 3+ ion was observed and analysed via luminescence properties. The luminous mechanism was explained by energy level scheme and energy transfer process in CaNb 2 O 6 : Sm 3+ phosphor. The strong excitation band peaking at ∼ 407 nm indicated that the CaNb 2 O 6 : Sm 3+ , Na + /B 3+ phosphor has a potential application in white light-emitting diodes based on near-UV LED chip.
研究领域:
材料科学
·
无机化学
·
发光材料
·
固体物理
·
光电子学
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DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2025
·
IF 8.9
Haoran Yu,Liang Cao,Jiajia Wang,Jian Guo,Ji Zhang,Shan-Tao Zhang
Piezoelectric materials have wide commercial applications involving our everyday lives. The common categorized “soft” and “hard” piezoelectric materials have distinct even contradictory performance parameters typically exemplified by piezoelectric coefficient d 33 and mechanical quality factor Q m . However, for some special devices operated in resonant mode, simultaneously high or at least balanced performance parameters are needed. Here, we show the transition from “soft” to “hard” performance in 2 mol% Sm doped (0.36- x )Pb(Ni 1/3 Nb 2/3 )O 3 - x Pb(Mn 1/3 Nb 2/3 )O 3 -0.28PbZrO 3 -0.36PbTiO 3 quaternary solid solution piezoceramics, for which the d 33 and planar electromechanical coupling factor k p decrease, while Q m and Curie temperature T c increase monotonously with increasing x value. As the results, balanced performance with moderate d 33 = 446 pC/N, k p = 0.49, Q m = 425, and T c = 170 °C are achieved around x = 0.03. This work not only shows the feasibility for combining “soft” and “hard” performance by forming appropriate solid solutions, but also provides a suitable material basis for further simultaneously optimizing piezoelectric parameters.
研究领域:
材料科学
·
功能陶瓷
·
压电材料
·
固溶体
·
介电物理
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·Vol. 54
·期 30
·11581-11587
·
IF 3.3
Haoran Yu,Liang Cao,Jiajia Wang,Jian Guo,Ji Zhang,Shan-Tao Zhang
Pb(Ni1/3Nb2/3)O3-PbZrO3-PbTiO3 (PNN-PZ-PT) is one of the typical relaxor-PT piezoelectric systems. In order to further improve its Curie temperature (Tc) and piezoelectric properties, nominal Pb(Mg1/3Nb2/3)O3 (PMN) is introduced into 2mol% Sm-doped 0.36PNN-0.28PZ-0.36PT to form a (0.36 − x)PNN-xPMN-0.28PZ-0.36PT:0.02Sm (x = 0–0.24) quaternary solid solution. The phase, microstructure, domain structure, and electrical properties of the solid solution ceramics were investigated systematically. All the samples exhibit a single phase perovskite structure and are situated around the rhombohedral-tetragonal morphotropic phase boundary. With increasing x, the Tc increases gradually, while the piezoelectric coefficient d33 increases initially and decreases subsequently, reaching a peak value of 725 pC N−1 at around x = 0.15. In particular, this optimal composition illustrates high performance with Tc = 176 °C, planar electromechanical coupling factor kp = 0.63, remanent polarization Pr = 30 μC cm−2, and coercive field Ec = 8.9 kV cm−1. This study illustrates the viability of incorporating PMN into PNN-PZ-PT to optimize the comprehensive electrical properties, potentially offering a valuable guide for developing high performance relaxor-PT materials.
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DOI
PubMed
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2024
·
IF 2.5
Jitao Zhang,Xingkui Mu,Qingfang Zhang,Natallia Poddubnaya,Dmitry Filippov,Jiagui Tao,Fang Wang,Liying Jiang,Lingzhi Cao
Development of high-quality ferrites behaved enhanced properties via inclusion of ions in 3d n and 4f n series are desirable for efficient power conversion solid-state devices. Nevertheless, inadequate microscopic behaviors with complex chemistry in materials enables researchers to design and produce the macroscopic target device that remained rudimentary and mindless. In this work, the microscopic properties in nickel-zinc spinel ferrite series of Ni 0.8 Zn 0.2 Sm x Fe 2- x O 4 ( x = 0, 0.02, 0.04, 0.06, 0.08) encompassing XRD, SEM, EDS, VSM, FTIR and ESR were systemically characterized, and the evolutionary mechanism of the corresponding structural, micro-structure, elemental composition and distribution, magnetic, cations exchange, and micro-magnetic behavior was profoundly revealed. Under microscopic examinations, the optimum composition at x = 0.02 with well-arranged spinel structure, dense texture with expected elemental composition, favorable soft magnetic properties and micro-magnetic behaviors is evident. Fortunately, this optimum is in coincidence with the achievable maximum magneto-mechanical coefficient, even the macroscopic electric properties with stronger magnetoelectric (ME) interactions and higher power conversion efficiency (PE) in tri-layered ME samples as expected. Experimental results show that the eventual PE reaches its maximum of 75.67 % under R opt = 33kΩ for samples at x = 0.02, and exhibit a 2.24 times higher PE than that of sample without samarium substitution. These findings provide a holographic perspective to connect the microscopic beneficial effects of materials to bulk device that are promising for efficient power conversion solid-state electronics.
研究领域:
材料科学
·
磁性材料
·
固态电子学
·
功能陶瓷
·
能源转换技术
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Zeyi Wang,Luyao Zhang,Rong Su,Lu Yang,Feng Xiao,Lichuan Chen,Ping He,Dingming Yang,Yali Zeng,Yun Zhou,Ying Wan,Bin Tang
The abuse and uncontrolled discharge of antibiotics present a severe threat to environment and human health, necessitating the development of efficient and sustainable treatment technology. In this work, we employ a facile one-step electrodeposition method to prepare polyaniline/graphite oxide (PANI/GO) and samarium (Sm) co-modified Ti/PbO 2 (Ti/PbO 2 -PANI/GO-Sm) electrode for the degradation of amoxicillin (AMX). Compared with traditional Ti/PbO 2 electrode, Ti/PbO 2 -PANI/GO-Sm electrode exhibits more excellent oxygen evolution potential (2.63 V) and longer service life (56 h). In degradation experiment, under optimized conditions (50 mg L −1 AMX, 20 mA cm −2 , pH 3, 0.050 M Na 2 SO 4 , 25 °C), Ti/PbO 2 -PANI/GO-Sm electrode achieves remarkable removal efficiencies of 88.76% for AMX and 79.92% for chemical oxygen demand at 90 min. In addition, trapping experiment confirms that ·OH plays a major role in the degradation process. Based on theoretical calculation and liquid chromatography-mass spectrometer results, the heterocyclic portion of AMX molecule is more susceptible to ·OH attacks. Thus, this novel electrode offers a sustainable and efficient solution to address environmental challenges posed by antibiotic-contaminated wastewater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 9
·e20693
·
IF 3.8
Yanhao Song,Xiuhua Ji,Kui Tang,Yihao Zhang,Tongshen Xu,Shiyin Ji,Tao Duan
Zirconolite and pyrochlore are recognized as the promising candidates for HLW immobilization because of their excellent chemical durability, radiation resistance and so on. In this study, the nominal CaZr 1- x Sm x Ti 2- x Nb x O 7 ( x = 0.1–1.0) compounds were synthesized to explore their microstructure, phase evolution and chemical durability. The X-ray diffraction (XRD), back-scattered scanning electron microscopy with energy dispersive X-Ray spectrometry (BSEM-EDS) and Raman analysis results displayed that the phase transformation was two-layer to four-layer monoclinic zirconolite (2M to 4M) and then to cubic pyrochlore with concentration of Sm 3+ and Nb 5+ raising. The crystalline structure evolution of 2M to 4M zirconolite and zirconolite-4M to cubic pyrochlore were determined firstly at x = 0.2 and x = 0.3 sample, respectively. Zirconolite-4M with trace perovskite was prepared at x = 0.2 sample. Near single-phase pyrochlore would be obtained when x ≥ 0.4. Moreover, the chemical durability of zirconolite-4M was stronger than zirconolite-2M and the composite of zirconolite-4M and pyrochlore. The findings could be helpful for the design of zirconolite-based waste forms for actinides such as Np 3+ , Am 3+ , and others.
研究领域:
材料科学
·
核废物处理
·
无机非金属材料
·
固态化学
·
放射化学
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Shuqing Zhou,Qiuling Yang,Yi Liu,Lianrui Cheng,Tayirjan Taylor Isimjan,Jianniao Tian,Xiulin Yang
Crafting resilient catalysts that promote H 2 production through the hydrolysis of hydrogen storage materials like sodium borohydride stands paramount for the impending hydrogen economy. In this study, we propose a versatile metal–organic framework (MOF)-assisted approach to systematically explore the impact of electron-metal support interaction (EMSI) of Ru-modified Co-Sm 2 O 3 (Ru/Co-Sm 2 O 3 ) on H 2 evolution from NaBH 4 hydrolysis. Strategic annealing at 800 °C induces cobalt vacancies on the Ru/Co-Sm 2 O 3 surface, optimizing the exposure of active sites and amplifying mass-charge transfer efficiency. Consequently, the defect-enriched Ru/Co-Sm 2 O 3 showcases an impressive hydrogen generation rate (HGR = 0.430 mol min −1 g catalyst −1 ) and outstanding cycling resilience, eclipsing the performance of most contemporary catalysts. Experimental findings reveal that Sm can not only adjust the Ru lattice spacing to accommodate more BH 4 − , but also modulate the Co vacancy concentration, thus bolstering the charge transport and ameliorating the catalyst's electrical conductivity. DFT calculations confirm that the Michaelis-Menten/Eley-Rideal mechanism is more appropriate to explain the hydrolysis of NaBH 4 .
研究领域:
材料科学
·
催化化学
·
能源化学
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产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Muhammad Yousaf,Yuzheng Lu,Majid Niaz Akhtar,Ali Sarosh Khawaja,Khalid Mujasam Batoo,Sajjad Hussain,Asma Noor,Muhammad Akbar,Hu Enyi,M.A.K Yousaf Shah,Naveed Mushtaq,Bin Zhu
Lattice defects in rare earth (RE) doped single-phase semiconductor materials play a key role in structural modifications and physicochemical characteristics, resulting to enhance the ionic conductivity. In this work, we synthesized lanthanum doped samarium oxide with different mole ratios and applied it as a ceramics membrane fuel cell device to enable high peak power density (PPD) at low operational temperatures (520–400 °C). The samples are capable of triple charge H + /O 2− /e − conduction and enhance the catalytic function of the cell in terms of HOR and ORR kinetics by producing lattice defects. The fabricated Sm 1.5 La 1.5 Fe 5 O 12 (2-SLFO) fuel cell device exhibits a high OCV of 1.13 V with a maximum PPD of 864.26 mW/cm 2 at 520 °C. Durability measurement verifies that 2-SLFO-based fuel cell device can be worked for 60 h under fuel cell conditions (H 2 /air) at 520 °C. The first principle calculations using density functional theory (DFT) demonstrate that the higher oxygen vacancy concentration in the 2-SLFO sample may cause to the higher charge-transfer kinetics, subsequent in the enhancement of ions transportation of the fabricated fuel cell device.
研究领域:
材料科学
·
电化学
·
能源材料
·
固态离子学
·
燃料电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Zheng Gong,Yufei Gong,Junhui Hao,Zeyang Jang,Jiawei Yan,Tianle Bai,Yudong Xiao,Chun Wang
Near-infrared long-afterglow nanomaterials hold significant potential in nanomedicine platforms, including targeted drug delivery, precise imaging, and immunotherapy. Improving the particle size distribution and reducing the nanoparticle size to enhance biocompatibility are crucial. Due to the small size effect, reducing the nanoparticle size and improving uniformity typically lead to a decrease in afterglow performance. In this study, near-infrared long-afterglow nanoparticles, Zn 2 Ga 2.98 − x Ge 0.75 O 8 :Cr 3+ 0.02 ,Sm 3+ x ( x = 0, 0.02, 0.04, 0.06, 0.08) (ZGGO:Cr 3+ ,Sm 3+ x ), were synthesized using the Sm 3+ ion doping strategy at varying doping concentrations. This work reveals how cation substitution simultaneously affects the nanoparticle size and enhances the near-infrared long-afterglow luminescent performance. The Sm 3+ ion doping overcame the increased surface defects caused by the reduced particle size, while simultaneously improving the number of effective luminescent centers by modifying the crystal field environment around the luminescent center. The afterglow intensity and duration of ZGGO:Cr 3+ ,Sm 3+ x nanoparticles were significantly enhanced. The study shows that Sm 3+ ion doping effectively reduces the size of ZGGO:Cr 3+ ,Sm 3+ x nanoparticles while extending the near-infrared long-afterglow time by modulating trap depth, the interaction between traps and excited-state energy levels, and the competition between thermal activation and tunneling processes.
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Xiaoju Huang,Guihong Zhang,Chaoyong Deng,Min Zhang
Trivalent rare earth ions samarium and europium ions were doped into the prepared Gd 2 MgTiO 6 host crystal structure by high temperature solid phase method. XRD patterns show that the synthesized materials belong to the monoclinic structure with space group P 21 / n . Using UV-visible spectroscopy, the band gaps can be calculated to be 4.18, 4.15 and 3.84 eV for host, Sm 3+ and Eu 3+ -doped samples, respectively. For Sm-doped sample excited with 407 nm, the PL spectrum shows three prominent peaks at 565 nm, 603 nm and 649 nm, which are attributed to the transitions of 4 G → 5 / 2 6 H 5/2 , 4 G → 5 / 2 6 H 7/2 and 4 G → 5 / 2 6 H 9/2 , respectively. The 591 nm and 615 nm emissions of Eu 3+ doping correspond to the transitions from 5 D 0 to 7 F 1 and 7 F 2 , respectively. The optimal concentrations are 0.03 mol and 0.09 mol for Sm 3+ and Eu 3+ doping, respectively. The prepared samples can be used in the field of LEDs thanks to lower color temperature CCT=1700∼2200 K and higher color purity >97%.
研究领域:
材料科学
·
光电子学
·
固体物理
·
无机化学
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
C. Wang,X.Z. Zheng,L. Yue,P.J. Xia,M. Xu,W.B. Dai
The exploration of stable/efficient phosphor for n -UV chip pumped white light-emitting diodes ( w LEDs) remains an arduous task. Herein, a novel series of color tunable Eu 2+ /Tb 3+ /Sm 3+ tridoped Sc-based cyclosilicate phosphors (KBaScSi 3 O 9 : Eu 2+ /Tb 3+ /Sm 3+ ) have successfully designed and obtained via facile solid-state reaction based on comprehensive consideration of rigidly structural network of host, weak electron-phonon coupling strength and spectral adjustability of codopants via energy transfer (ET). The crystallographic occupancies of Eu, Tb and Sm primary in Ba/K, Ba and Ba sites in the monoclinic host, respectively were determined on the basis of the Rietveld refinements and crystal chemistry rules. The photoluminescence (PL) properties were systematically investigated in conjunction with structural analyses, implying that the ‘warm’ white light with excellent thermal stability is stemmed from combination of optimized blue (Eu 2+ ), green (Tb 3+ ) and red (Sm 3+ ) emissions via Eu → Tb → Sm ET strategy. Interestingly, Tb ions play both roles of green light luminescent center and ET bridge to achieve cascade ET for connecting Eu/Sm ion pairs because of the adverse metal-metal charge transfer (MMCT) effect (Eu 2+ + Sm 3+ → Eu 3+ + Sm 2+ ). Furthermore, the phosphor-converted w LEDs (pc- w LEDs), by encapsulating the optimal KBS: 4 %Eu/4 %Tb/6 %Sm with commercial n -UV LED chip, show high thermal stability with satisfactory electroluminescence (EL) performances. These results indicate the KBS: Eu/Tb/Sm phosphors are potential candidates for application in high power n -UV pumped pc- w LEDs.
研究领域:
材料科学
·
发光材料
·
固态照明
·
无机化学
·
光电子学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Yunfei Wang,Sixia Li,Yuzhu Yang,Peng Zhang,Wenfei Qin,Sai Zhou,Xuan Miao,Zenggang Lin,Weisheng Liu
Materials exhibiting long-persistent luminescence (LPL) in the visible spectrum hold pivotal importance for anti-counterfeiting and encryption. Nevertheless, conventional LPL materials generally possess a fixed afterglow color. This constraint makes it imperative to develop multimodal luminescent systems featuring spectrally tunable afterglow. Herein, the Er3+/Sm3+ co-doped Ca3Ga4O9 phosphors achieve multicolor photoluminescence (PL), upconversion luminescence (UCL), and color-tunable LPL by responding to multiple excitations modes ranging from ultraviolet (UV) to near-infrared radiation (NIR). Spectral analysis reveals a green-to-orange multicolor afterglow by varying the relative concentrations of Er3+ and Sm3+ ions. To unravel the mechanism of multicolor afterglow, afterglow spectra and thermoluminescence (TL) spectra are systematically employed to probe the trap distribution mediated by Er3+ and Sm3+ co-doping. Finally, their prospective application in optical anti-counterfeiting and information encryption is also systematically investigated based on the color-tunable LPL. This successful integration of multicolor, multimodal luminescence with color-tunable afterglow in a single host provides a novel platform for anti-counterfeiting and encryption, significantly expanding the visual diversity of displayable information.
研究领域:
材料科学
·
光学物理
·
固体物理
·
发光学
·
防伪技术
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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）