CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ying Li,Yong Hong Ma,Aihua Mao,Xiwei Qi
A series of transparent (1- y )La 2 O 3 –Ga 2 O 3 - y Sm 2 O 3 - x Eu 2 O 3 (where x = 0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14, and y = 0, 0.04) were successfully synthesized using a containerless solidification process. Co-doping with Sm 3+ and Eu 3+ enhanced the energy absorption of Eu 3+ , notably improving the characteristic emission peak 5 D 0 - 7 F 2 of Eu 3+ . The peak emission intensity for y = 0.04 was observed at x = 0.08, attributable to the concentration quenching of Eu 3+ ions. As the concentration of Eu 3+ increased, the energy transfer effect on emission intensity diminished. Attributed to the energy transfer between Sm 3+ and Eu 3+ , Sm 3+ may primarily serve as the sensitizer, and Eu 3+ as the activator. According to the Dexter theory, which suggests that the interaction between activator ions and their adjacent ions is the primary mechanism of energy transfer and quenching among Eu 3+ ions and adjacent ions, an increase in Eu 3+ concentration leads to a decrease in the distance between Eu 3+ and adjacent ions, strengthening their interaction, and potentially inducing concentration quenching. Furthermore, with an increase in Eu 3+ concentration, the CIE chromaticity coordinates for the samples co-doped with Sm 3+ and Eu 3+ shifted significantly, enhancing the color purity of the emitted light and bringing it closer to the NTSC color standard coordinates (0.67, 0.33).
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Kun Zhang,Yan Huang,Yin-Jing Shen,Shuang Ma,Ting-Ting Chen
The development of convenient and efficient fluorescence techniques is of great significance for selective detection and precise determination of biotoxic N 2 H 4 in human health and environmental sciences. By the pre-organization-assisted template synthesis , disclosed here is a luminescent Sm(III) macrocycle-based probe Sm - 2 m bearing dynamic imine bonds as recognition moieties which provides the selective and ratiometric turn-off fluorescence sensing for N 2 H 4 over various amine species based on the N 2 H 4 -induced structure transformation. This fluorescent sensing process finished within 20 min shows the low limit of detection (0.18 μM, 7.2 ppb) and wide linear sensing range (0–60.0 μM). Furthermore, probe Sm - 2 m is also be used to quantitatively determine N 2 H 4 in vapor gas and water samples through fluorescence color changes, which are evaluated by the Sm - 2 m -impregnated test paper strips and RGB value outputs. Finally, our proposed smartphone-based analytical method gives satisfactory N 2 H 4 detection results. It is thus believed that this work can shed some lights on development of optical probes and detection techniques for N 2 H 4 , even other hazardous chemicals.
研究领域:
化学
·
环境科学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS-CONDENSED MATTER
·
2021
·Vol. 33
·期 26
·265701
·
IF 2.333
Chengping He,Xue Ming,Qing Li,Xiyu Zhu,Jin Si,Hai-Hu Wen
Recently, superconductivity at about 9–15 K was discovered in Nd1−xSrxNiO2 (Nd-112, x ≈ 0.125–0.25) infinite-layer thin films, which has stimulated enormous interests in related rare-earth nickelates. Usually, the first step to synthesize this 112 phase is to fabricate the RNiO3 (R-113, R: rare-earth element) phase, however, it was reported that the 113 phase is very difficult to be synthesized successfully due to the formation of unusual Ni3+ oxidation state. And the difficulty of preparation is enhanced as the ionic radius of rare-earth element decreases. In this work, we report the synthesis and investigation on multiple physical properties of polycrystalline perovskites Sm1−xSrxNiO3 (x = 0, 0.2) in which the ionic radius of Sm3+ is smaller than that of Pr3+ and Nd3+ in related superconducting thin films. The structural and compositional analyses conducted by x-ray diffraction and energy dispersive x-ray spectrum reveal that the samples mainly contain the perovskite phase of Sm1−xSrxNiO3 with small amount of NiO impurities. Magnetization and resistivity measurements indicate that the parent phase SmNiO3 undergoes a paramagnetic–antiferromagnetic transition at about 224 K on a global insulating background. In contrast, the Sr-doped sample Sm0.8Sr0.2NiO3 shows a metallic behavior from 300 K down to about 12 K, while below 12 K the resistivity exhibits a slight logarithmic increase. Meanwhile, from the magnetization curves, we can see that a possible spin-glass state occurs below 12 K in Sm0.8Sr0.2NiO3. Using a soft chemical reduction method, we also obtain the infinite-layer phase Sm0.8Sr0.2NiO2 with square NiO2 planes. The compound shows an insulating behavior which can be described by the three-dimensional variable-range-hopping model. And superconductivity is still absent in the polycrystalline Sm0.8Sr0.2NiO2.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RENEWABLE ENERGY
·
2019
·
IF 5.439
Qing Zhou,Xinyan Zhong,Xingyue Xie,Xuanyi Jia,Baiquan Chen,Ning Wang,Lihong Huang
Biomass-derived acetic acid (HAc), as a hydrogen storage medium, can be transformed to hydrogen via on-board reformer for fuel cells. Steam reforming (SR) of HAc is a traditional hydrogen production process, but endothermicity of SR is a concern for heat management in dynamic on-board application. Auto-thermal reforming (ATR) of HAc is a promising route, while catalyst deactivation in harsh ATR atmosphere should be addressed. Samarium-promoted ordered mesoporous Ni-xSm-Al-O catalysts were synthesized via improved evaporation-induced self-assembly (EISA) method, and tested in ATR of HAc for hydrogen production. The Ni-2Sm-Al-O catalyst produced a stable HAc conversion near 100.0% and a hydrogen yield at 2.6 mol-H 2 /mol-HAc in a 30-h test. Meanwhile, the Ni-2Sm-Al-O catalyst shows resistance to oxidation , sintering and coking; this improved reactivity and durability can be attributed to basic Sm oxides and ordered mesoporous framework with confinement effect : the basic sites are beneficial to adsorption and activation of HAc, and the ordered mesoporous framework constrains the thermal agglutination of Ni metal and formation of coking, while intermediate carbonous species of *CH x (x = 0–3) can be gasified via the Sm 2 O 3 -Sm 2 O 2 CO 3 cycle. These Sm-promoted Ni-based catalysts are also tested with different temperatures and O/C, and show potentials in ATR of HAc for hydrogen production.
研究领域:
能源化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jian Wu,Ying Zhang,Min Luo,Bing Lu,Yan Yang,Kai Sun,Daming Chen,Yingli Liu,Jie Li
Co 2 Z ferrite with superior performance is a beneficial material for high filter devices and antenna substrates. In this work, Ba 3 Co 2 Fe 24-x Sm x O 41 ( x = 0.00–0.50 with a step of 0.10) materials were prepared using low temperature-fired process with 2.5 wt% of Bi 2 O 3 . The phase formation, microstructure, magnetic property , complex permittivity, and complex permeability were studied using X-ray diffraction, scanning electron microscopy, vibrating sample magnetometer , and vector network analyzer. The materials remained in a single hexagonal phase, and the grain size increased with increase of Sm-doped content. Saturation magnetization of samples increased at first and then decreased. When x = 0.20 and 0.30, the value of 4π M S was 2910.4 G and 2861.7 G, respectively. The variation of saturation magnetization is mainly due to the occupancy of Sm 3+ ions. When Sm 3+ ion doped Fe 3+ ion of Co 2 Z ferrite, Sm 3+ ion first preferred to occupy 4e IV site due to its low electronegativity, and then occupied 12k and 4f sites at high doped content, affecting magnetic moment and magneto-crystalline anisotropy. Furthermore, low-temperature sintering improves magnetic-dielectric properties of Sm-doped materials in high-frequency range. The real part of magnetic permeability (μ′) reached a maximum value of 8.4 when x = 0.20 and the real part of dielectric permittivity (ε′) reached a maximum value of 14.1 when x = 0.30. The magnetic loss and dielectric loss remained low (tanδ μ = 0.05–0.08 and tanδ ε = 0.005–0.04) and the off-cut frequency was nearly 1 GHz. The results indicated that these magnetic-dielectric materials have great potential for high-frequency antenna applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Jieying Li,Jiachun Liu,Quwei Ni,Qijian Zhu,Zhi Zeng,Jiansheng Huo,Chenggang Long,Qianming Wang
The strategy to enhance phosphor stability against thermal quenching and moisture conditions will contribute to controlling the feature of phosphor-converted white-light-emitting diodes (pc-WLEDs). Herein, an effective strategy is achieved with the incorporation of Sm3+ ions, and a robust reddish-orange emission (no thermal quenching up to 498 K) is obtained based on Ba3LaNb3O12 as a host. In light of excitation by near-ultraviolet irradiation at 408 nm, Ba3LaNb3O12:Sm3+ gives rise to a typical signal ascribed to the 4G5/2 → 6HJ/2 (J = 5, 7, 9, and 11) transitions of Sm3+ ions. The concentration quenching effect is observed when the Sm3+ content exceeds 10%, and the quenching mechanism is caused by electronic dipole–dipole interactions. Based on the narrow emission curves, a very high color purity (92.4%) could be recorded. The Sm3+ substitution at the Ba2+/La3+ site leads to a rigid structural lattice and abundant electron-trapping centers for the Sm3+ ions, which will be responsible for the zero-thermal-quenching phenomenon. In addition, oleic acid (OA) is selected to form a hydrophobic covering surface structure to protect Ba3LaNb3O12:Sm3+, which can assist in improving the moisture resistance. The most favorable parameters concerning the warm-light emission (a high general color rendering index, Ra, of 85.7 and a low correlated color temperature, CCT, of 4965 K) can be achieved in pc-WLEDs containing an OA-modified sample. Moreover, its luminous efficiency, LE, can maintain 82.9% of its initial value after 120 h under controlled environmental conditions of 85 °C and 85% humidity. These results pave a new way to optimize the sample as a potential candidate for red-emitting materials.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2016
·Vol. 119
·期 6
·
IF 2.101
Shi Xin Xin,Liu Xiao Qiang,Chen Xiang Ming
The evolution of structure, ferroelectric, and piezoelectric properties in Bi 1−x Sm x Fe 0.99 Ti 0.01 O 3 ceramics was extensively investigated within the entire morphotropic phase boundary region with 0 ≤ x ≤ 0.20. A sequential phase transition of R3c-Pna2 1 -Pbnm with increasing Sm content was revealed by Rietveld refinement of the X-ray diffraction data together with the macroscopic ferroelectric measurements. Both ferroelectric and piezoelectric properties showed a great enhancement in the vicinity of the R3c/Pna2 1 (polar-to-polar) phase boundary, which should be caused by the field-induced phase transition between these two phases. Such field-induced phase transition might be essentially accompanied by a change of magnetic state, which indicated a way of controlling magnetism by means of electric field.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·Vol. 63
·期 6
·845-853
·
IF 1.004
Chen X.,Gao R. -L.,Li B.,Wang H. -M.
Abstract Reaction of SmCl 3 ·6H 2 O with 3 equiv. of dihydroxodiphenylarsonium chloride [Ph 2 As(OH) 2 ]Cl resulted in the first structurally characterized lanthanide complex of organoarsinate [Sm(μ-O 2 AsPh 2 ) 3 ]. Single crystal X-ray diffraction reveals that this complex belongs to the trigonal system, \(R\bar{3}\) space group, with a = 24.077(3) Å, b = 24.077(3) Å, c = 10.708(1) Å, β = 120°, V = 5375.8(1) Å 3 and Z = 6. This homoleptic compound features a 1D polymer arrangement in which two Sm atoms are bridged by three diphenylarsinate [Ph 2 AsO 2 ] – ligands under syn,syn μ 2 –η 1 :η 1 bridging mode. The coordination number of Sm center is 6, giving an almost perfect octahedron geometry. The antibacterial activity of [Sm(μ-O 2 AsPh 2 ) 3 ] is much weaker than the free ligand [Ph 2 As(OH) 2 ]Cl.
研究领域:
无机化学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hongbo Liu,Xu Wang,Chaoyong Deng,Min Zhang
In this investigation, the photoluminescence properties, energy transfer phenomenon of BaY 2 ZnO 5 :Sm 3+ /Eu 3+ doped/co-doped phosphor are reported and synthesized by high temperature solid state reaction method. The crystal structure, micromorphology, optical diffuse reflectance and photoluminescence properties of the samples were studied. The results show that concentration quenching phenomenon is found. With the increase of Eu 3+ ion concentration, the emission peaks of Sm 3+ gradually decrease, indicating that energy transfer between Sm 3+ and Eu 3+ . The optimal concentrations are 0.05 mol and 0.2 mol for single doping Sm 3+ and Eu 3+ , respectively. The energy transfer efficiency is calculated to be 78.47–95.19 %. The BaY 2 ZnO 5 phosphors have potential application value in the fields of white light LEDs and anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hongrui Jia,Jiahao Mi,Zhen Li,Linghang Wang
Sm-doped Pb(Mg 1/3 Nb 2/3 )-PbTiO 3 (PMN-PT) binary ferroelectric ceramics has received extensive attention due to the excellent dielectric and piezoelectric properties . However, its Curie temperature ( T c ) is greatly reduced by Sm doping and T c is only 89 °C at the optimum piezoelectric coefficient. In this work, Sm-doped Pb(Mg 1/3 Nb 2/3 )O 3 –Pb(Zn 1/3 Nb 2/3 )-PbTiO 3 (Sm: PMN-PZN-PT) ternary ferroelectric ceramics near MPB were successfully manufactured and the crystal structure, microstructure and electric properties were investigated with respect to Sm doping content. A high piezoelectric coefficient of 870 pC/N and a high T c of 146 °C were achieved simultaneously in PMN-PZN-PT ternary ceramics with 1% Sm doping content. In addition, the room temperature dielectric constant was greatly improved by Sm doping and the P r , P s and E c values gradually decrease with the increase of Sm content. These results indicate that Sm-doped PMN-PZN-PT ceramics may be an attractive material for high performance piezoelectric device applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Longfei An,Yan Shan,Congmin Yang,Kezheng Chen,Xuegang Yu
In modern detection technology, the integration of lidar and microwave radar significantly increases the risk of exposure for high-value military equipment. Developing materials with multi-band stealth compatibility is a critical countermeasure to mitigate detection risks. In this study, a brownish-yellow samarium iron oxide material compatible with both 1.06 μm laser stealth and radar stealth was synthesized using the co-precipitation method, whose properties can be tuned by varying the raw material ratios. When the samarium-to-iron (Sm:Fe) ratio was 3:7, the primary crystalline phase was Sm 3 Fe 5 O 12 . Conversely, at Sm:Fe ratios of 1:1, the primary crystalline phase shifted to perovskite-type SmFeO 3 . Notably, Sm 3 Fe 5 O 12 material, prepared with a samarium-to-iron molar ratio of 3:7 and sintered at 800°C, demonstrated a reflectivity of 29.6 % at 1064 nm and excellent microwave absorption performance at 14.64 GHz, achieving a minimum reflection loss (RL min ) of −24.56 dB at a thickness of 4 mm and the effective absorption bandwidth of 1.36 GHz (13.76–15.12 GHz). This study provides a simple method for synthesizing brownish – yellow magnetic samarium iron oxide, which shows wide application in laser stealth, radar stealth and visual camouflage in plateau desert environments.
研究领域:
材料科学
·
光学工程
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 3
·512
·
IF 3.2
Zechi Ma,Zixuan Yuan,Zhonghua Yao,Jiangxue Chen,Hua Hao,Minghe Cao,Hanxing Liu
Piezoelectric materials (PZTs) enjoy extensive applications in the field of electromechanical sensors due to their sensitive response to external electric fields. The limited piezoelectric response for single-layer piezoceramic pellets drives the use of multilayered technology to increase the electric displacement of a single piezo device. As is well known, Ag is commonly used as a metal for electrodes in devices based on traditional PZTs, which always densify at a high temperature above 1100 °C, resulting in Ag migration. Here, a high-performance samarium-ion-doped Sm0.01Pb0.99(Zr0.54Ti0.46)O3ceramic was selected as parent materials to develop a new Ag-cofired ceramic matrix with a sintering temperature of 920 °C by glass flux. The ceramic composition with 2.0 wt% glass addition exhibits the excellent performance of piezoelectricd33~492 pC/N, planar electromechanical coupling coefficientkp~50.1%, mechanical quality factorQm~68.71, and Curie temperatureTc~356 °C, respectively. The cyclic stability ofd33was measured below 6.6% at 30 kV/cm, which indicates that the piezoceramic has good temperature stability and fatigue resistance. Therefore, this study provides a novel high-performance piezoelectric system to meet the cofired requirement for multilayered piezoelectric devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）