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Saturable absorption and visible pulse modulation of few-layer topological nodal-line semimetal HfGeTe

Chinese Optics Letters 2024年第3期22卷 89-94页

作者：赵启明张首焱王树贤王刚于浩海张怀金 State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Topological nodal-line semimetals attract growing research attention in the photonic and optoelectronic fields due to their unique topological energy-level bands and fascinating nonlinear optical responses.Here,to the best of our knowledge,we first report the saturable absorption property of topological nodal-line semimetal HfGeTe and the related pulse modulation in passively Q-switched visible lasers.Few-layer HfGeTe demonstrates outstanding saturable absorption properties in the visible-light band,yielding the saturation intensities of 7.88,12.66,and 6.64μJ/cm^(2)at 515,640,and 720 nm,respectively.Based on an as-prepared few-layer HfGeTe optical switch and a pr:LiYF_(4)gain medium,Q-switched visible lasers are also successfully achieved at 522,640,and 720 nm.The minimum pulse widths of the green,red,and deep-red pulsed lasers are150,125.5,and 420 ns,respectively.Especially for the green and red pulsed laser,the obtained pulse width is smaller than those of the low-dimensional layered materials.Our work sheds light on the application potential of topological nodal-line semimetals in the generation of visible pulsed lasers.

关键词： visible pulsed laser topological nodal-line semimetals saturable absorption Q-switching pr doping

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production of phenolic compounds in catalytic pyrolysis of bagasse lignin in the presence of Ca_(0.5)pr_(0.5)FeO_(3)

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Journal of Rare Earths 2022年第2期40卷 279-288,I0004页

作者： Hongjing Han Qin Ge Mei Zhang Yanguang Chen Haiying Wang Yanan Zhang Yizhen Wang Hua Song Chunlei Zhang College of Chemistry&Chemical Engineering Northeast Petroleum UniversityDaqing 163318China Heilongjiang provincial Key Laboratory of Oil&Cos Chemical Technology Daqing 163318China

Herein,sodium dodecylbenzene sulfonate(SDBS)was used as a template to control the synthesis of Ca_(0.5)pr_(0.5)FeO_(3).Its microstructure,composition,and morphology were detected via X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),and scanning electron microscopy(SEM).The properties of catalyzing bagasse lignin(BL)pyrolysis were determined by thermogravimetric analysis(TG)test and evaluation of a fixed bed alumina microreactor.The results show that the sample Ca_(0.5)pr_(0.5)FeO_(3)regulated by SDBS has a cubic crystal phase,and the addition of SDBS does not cause phase transition.Moreover,when the SDBS concentration is 0.10 mol/L,the particle size is 200-500 nm and the specific surface area is 11.26 m^(2)/g.The yields of gas,liquid,and solid products in the BL catalytic pyrolysis are 39.58 wt%,26.76 wt%and 32.36 wt%,respectively.The contents of CO_(2)and CO decrease from 54.07%and 4.98%to 45.29%and 3.23%,respectively.The liquid products are mainly guaiacol,syringol,and phenol,and the total selectivity of phenols is 83.67%,accompanied by a small amount of non-aromatic oxygen-containing compounds(five-membered ring(furan)or ester).Compared with the BL pyrolysis and Ca_(0.5)pr_(0.5)FeO_(3)catalytic pyrolysis products,the selectivity of guaiacol compounds increases by43.26%,while those of syringol compounds and phenylketones decrease by 30.08%and 3.39%,respectively.The selectivity of 2,6-dimethoxyphenol is 28.37%.After five catalytic pyrolysis-regeneration cycles,the characteristic peaks of the catalyst do not change significantly and the particles are uniform,suggesting that the catalyst has good crystal phase stability and regeneration stability.

关键词： Bagasse lignin Calcium ferrite pr doping Catalytic pyrolysis Guaiacol Rare earths

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pr doped single-crystal LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2)cathode enables high rate capability and cycle stability for lithium ion batteries

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Journal of Materiomics 2023年第1期9卷 82-89页

作者： Xiaopei Zhu Han Yu Lina Cheng Feifei Xu Zilu Wang Li-Zhen Fan Key Laboratory of New Energy Materials and Technologies Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Tianjin Guoan Mengguli New Materials Science&Technology Limit Corporation Tianjin301811China Beijing Mengguli New Materials Science&Technology Co. LtdBeijing102200China

The massive application of single crystal(SC)ternary cathode material LiNi_(1-x-y)Mn_(x)Co_(y)O_(2)is largely restricted by the unsatisfactory rate capability which is caused by the sluggish Li+diffusion and structural instability.Herein,pr^(3+),a large radius ion is introduced to single-crystal LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2)to enhance Li^(+)conductivity and structural stability.With 0.4%pr doping,the Li(Ni_(0.5)Mn_(0.3)Co_(0.2))_(0.996)pr_(0.004)O_(2)cathode displays a capacity retention of 79.72%at 10 C,and a 98.17%capacity retention after 50 cycles at 25°C and 96.3%capacity retention after 50 cycles at 55°C within a 3.0–4.5 V voltage window.Electrochemical impedance spectroscopy confirms that the pr doping can effectively lower the charge-transfer resistance and facilitate the transportation of Li^(+)on the surface of LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2).The Direct current internal resistance result implies that the structure of the pr-doped cathode particles is more stable during cycling.In addition,differential scanning calorimetry measurements measurement combined with in situ X-ray diffraction confirms the thermo-stabilization effect of the pr dopant.

关键词： Single-crystal cathode material pr doping Rate capability Safety Lithium-ion battery

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Effects of praseodymium doping on thermoelectric transport properties of CaMnO_3 compound system

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Journal of Rare Earths 2013年第9期31卷 885-890页

作者：张飞鹏牛保成张坤书张忻路清梅张久兴 Institute of Physics Henan University of Urban Construction Key Laboratory of Advanced Functional Materials Chinese Ministry of EducationCollege of Materials Science and EngineeringBeijing University of Technology

The rare earth pr doped Ca1-xprxMnO3 （x=0, 0.06, 0.08, 0.1, 0.12, and 0.14） compound bulk samples were prepared to study the effect of pr doping on thermoelectric transport properties of CaMnO3 compound system. The doped samples exhibited sin-gle phase composition within the experimental doping range, with condensed bulk microstructure and small porosities. The electrical resistivity was remarkably reduced for doped samples, on account of the enhanced carrier concentration;the absolute value of See-beck coefficient was deteriorated mainly due to enhanced electron carrier concentration. The electrical performances of the doped samples reflected by resistivity and Seebeck coefficient fluctuations were optimistically tuned, with an optimized power factor value of 0.342 mW/（m·K2） at 873 K for x=0.08 sample, which was very much higher comparing with that of the un-doped sample. The lattice thermal conduction was really confined, leading to distinctly repressed total thermal conductivity. The thermoelectric per-formance was noticeably improved by pr doping and the dimensionless figure of merit ZT for the Ca0.92pr0.08MnO3 compound was favorably optimized with the maximum value 0.16 at 873 K.

关键词： CaMnO3 compound pr doping thermoelectric properties rare earths

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