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Comparison of the Thermomagnetic and Thermal Effects duringNanocrystallization of Amorphous Fe_(76.5-x)Cu_1Nb_xSi_(13.5)B_9 Alloys

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Journal of Materials Science & Technology 1998年第4期14卷 323-326页

作者： B.Varga and Tak■cs(Dept. of Mechanical Engineering Technology Technical University of Budapest, H-1111 Budapest Bertalan L. utca 2., Hungary) A.Lovas and P.Kamasa(Research institute for solid {2. {3., Hungarian academy of sciences, H-152. Budapest, Dept. of Mechanical Engineering Technology Technical University of Budapest Bertalan L.utca 2 H-1111 Budapest Hungary Research institute for solid {2. {3. Hungarian Academy of Sciences P.O.Box 49 H-1525 Budapest Hungary state key Lab. of RSA Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China institute of Materials Science Hungarian Academy of Science P.O.Box 49 H-1525 Budapest Hungary

The results of thermomagnetic (TM) and calorimetric (DSC) measurements have been compared in order to clarify some details of the mechanism of nanophase-formation from Finemet-type precursors with different Nb contents. It was found that the main features of the DSC thermograms (shape, relative separation and amplitude of the exothermic peaks characteristic for the precipitation of the Fe-(Si) solid solution and the transition metal borides) depend mainly on the composition of the precursor glass, and are only slightly affected by the heating rate between 2. and 80 K/min. The amplitude of the uprise of the magnetization in the TM curves (attributed to the precipitation of bcc-Fe(Si) and borides) decreases with increasing Nb-content. The Curietemperature of the precursor glasses. Tc(am1), the remainder amorphous phases, Tc(am2. and the bcc nanophase, Tc(n-Fe) are determined from the thermomagnetic curves. The shape of the TM curves is interpreted on the basis of the reactions describing the crystalIization of the hypo-eutectic Fe-B glasses.

关键词： Comparison of the Thermomagnetic and Thermal Effects duringNanocrystallization of Amorphous Fe B9 Alloys Cu x)Cu1NbxSi

Photo-induced effect in the layered perovskite manganite La_(1.2.Sr_(1.8)Mn_(1.8)Co_(0.2.O_(7)

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Science China(physics,Mechanics & Astronomy) 2004年第1期47卷 113-120页

作者： ZHANG Ruili1, DAI Jianming1, SONG Wenhai1, MA Yongqing1, YANG Jie1 & SUN Yuping1,2.1. key Laboratory of Internal Friction and Defects in solids, {2. of solid {3. physics, chinese academy of sciences, Hefei 2.003., China 2. National Laboratory of solid {3. Microstructures, Nanjing University, Nanjing 2.0008, China Correspondence should be addressed to Zhang Ruili (email: rlzhang@***) Received September 1, 2.03 key Laboratory of Internal Friction and Defects in solids Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China National Laboratory of solid state Microstructures Nanjing University Nanjing 210008 China

It is helpful to study the photo-induced effect in the perovskite manganites not only for elucidating the mechanism of colossal magnetoresistance (CMR) effect but also for potential applications in technology. The laser-induced effect in the Co doping layered perovskite manganites La1.2.r1.8Mn1.8Co0.2.7 is studied in this paper and the obtained results are also compared with that gained in the Nd-doping manganites with cubic perovskite structure.

关键词： laser, layered perovskite manganites, photo-induced effect, spin-state.

Research progress in terahertz quantum cascade lasers

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Science China(Information sciences) 2012年第1期55卷 16-26页

作者： CAO JunCheng key Laboratory of Terahertz solid-{2. Technology,Shanghai {3. of Microsystem and Information Technology,{3. academy of sciences,Shanghai 2.0050,China 1. key Laboratory of Terahertz solid-{2. Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

The terahertz(THz)quantum cascade laser(QCL)is a coherent THz source based on intersubband transitions of unipolar *** semiconductor lasers,THz QCLs are solid-state,electrically pumped,tunable,and can be easily *** paper reviews the state of the art for the design,operation temperature,and output power of THz *** applications in THz communication and imaging are also discussed.

关键词： terahertz quantum cascade laser communication imaging

EPR STUDY OF THE FORMATION OF[Li^+O^-]ION PAIR ON Li-DOPED ZnO

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chinese chemical Letters 1993年第3期4卷 251-254页

作者： Ting Lu YANG Liang Bo FENG Shi Kong SHEN Han Qin Wang state key Laboratory of Oxo Synthesis and Selective Oxidation,{2. {3. of {3. physics,chinese academy of sciences,{2. 73.000

In this letter the study of Li-doped zinc oxide by electron paramagnetic resonance method is described.A signal observed at g_=2.013.g_=1.955 on the degassed sample at 92.K was designated to F_s^+ centers(surface oxygen ion vacancies with a single trapped electron).When the sample was quenched from 1003. into liquid oxygen at 77K under 2. KPa O_2.[Li^+O^-] ion pairs valued at g_=2.02. and g=2.003.with superhyperfine constant a=2.0G,which resulted from ~7Li nucleus,formed at Li^+-substitutional site in ZnO lattice.A probable mechanism of [Li^+O^-]ion pair formation was proposed.

关键词： Li EPR STUDY OF THE FORMATION OF[Li ION PAIR ON Li-DOPED ZnO ZnO

Synthesis and Characterization of Tetrametal Cluster〔Co2.CO）6〕〔μ-HC2.H2.CH2.2.-μ〕〔Co2.CO）6〕

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chinese Journal of Structural Chemistry 1999年第4期 64-67页

作者： CHEN XueNian ZHANG Jie YIN YuanQi (state key Laboratory for Oxo Synthesis and Selective Oxidation,{2. {3. of {3. physics, the chinese academy of sciences, lanzhou 73.000) SUN Jie (Shanghai {3. of Organic Chemistry, the chinese Ac

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｔｅｎｓｅｉｎｔｅｒｅｓｔｉｎｔｒａｎｓｉｔｉｏｎｍｅｔａｌｃｌｕｓｔｅｒｓｃｏｎｔｉｎｕｅｓｂｅｃａｕｓｅｔｈｅｙｒｅｐｒｅｓｅｎｔｐｏｓｓｉｂｌｅｃｏｎｃｅｐｔｕａｌｂｒｉｄｇｅ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｔｅｎｓｅｉｎｔｅｒｅｓｔｉｎｔｒａｎｓｉｔｉｏｎｍｅｔａｌｃｌｕｓｔｅｒｓｃｏｎｔｉｎｕｅｓｂｅｃａｕｓｅｔｈｅｙｒｅｐｒｅｓｅｎｔｐｏｓｓｉｂｌｅｃｏｎｃｅｐｔｕａｌｂｒｉｄｇｅｓｂｅｔｗｅｅｎｈｏｍｏｇｅｎｅｏ...

关键词： cobalt dipropargyl ether carbonyl crystal structure

Adsorption and reaction of CO and O_2.on the Ag/Pt(110) surface studied by photoemis-sion electron microscopy

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chinese Science Bulletin 2001年第12期46卷 998-1002页

作者： HUANG Weixin & BAO Xinhestate key Laboratory of Catalysis, Dalian {2. of {3. {3., chinese academy of sciences, Dalian 11602., China state key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian China

The Ag/Pt(110) model catalyst was prepared by evaporating silver on Pt(110). Adsorption and reaction of CO and O2.on Ag/Pt(110) surface were studied in situ by photo-emission electron microscopy (PEEM) during the pressure range of 10-5-10-2.Pa at 480 K. The Ag/Pt(110) surface consisted of Pt(110), AgPt interface and Ag area after annealing at 500 K. The dosing pressure of CO and O2.had a larger influence on their adsorption on the Ag area than on the Pt(110) and AgPt interface. Small Pt clusters formed on the Ag area and AgPt interface, which had a stronger ability to adsorb CO than Pt(110) terrace. The existence of Ag had an obvious influence on the kinetic of CO oxidation on Pt(110). No pattern was observed on the AgPt interface under the same condition when the formation of reaction-diffusion waves occurred on Pt(110).

关键词： silver Pt(110) carbon monoxide oxygen adsorption reaction photoemission electron microscopy.

Generation of surface electrons in femtosecond laser-solid interactions

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Science China(physics,Mechanics & Astronomy) 2006年第3期49卷 335-340页

作者： XU Miaohua1, LI Yutong1, YUAN Xiaohui1,2. ZHENG Zhiyuan1, LIANG Wenxi1, YU Quanzhi1, ZHANG Yi1, WANG Zhaohua1, WEI Zhiyi1 & ZHANG Jie1 1. key Laboratory of Optical physics, {2. of physics,{3., Beijing 100080, China 2. state key Laboratory of Transient Optics Technology,{3., Xi’an 710068, China key Laboratory of Optical physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China state key Laboratory of Transient Optics Technology Chinese Academy of Sciences Xi’an 710068 China

The characteristics of hot electrons produced by p-polarized femtosecond laser-solid interactions are studied. The experimental results show that the outgoing electrons are mainly emitted in three directions: along the target surface, the normal direction and the laser backward direction. The electrons flowing along the target surface are due to the confinement of the electrostatic field and the surface magnetic field, while the electrons in the normal direction due to the resonant absorption.

关键词： hot electrons,surface magnetic field,femtosecond laser pulses

Investigation of the lubrication Failure Mechanisms of Several Thin solid Films

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Investigation of the Lubrication Failure Mechanisms of Sever...

A ^(13.CO isotopic study on the CO promotion effect in methane dehydroaromatization reaction over a Mo/HMCM-49 catalyst

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作者： Qunji Xue Deyang Yu state key Laboratory of {2. {3. {3. institute of chemical physics chinese academy of sciences {3. {12. P. R. China

＜正＞The lubrication failure mechanisms of several physical vapor deposited （PVD） thin solid films, especially of the ones for precision ball bearing and harmonic drive applications, have been investigated. The pro... 详细信息

关键词： PVD solid films Ball bearing: Harmonic drive lubrication failure mechanism

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Journal of Natural Gas Chemistry 2010年第1期19卷 1-5页

作者： Songdong Yao, Changyong Sun, Juan Li, Xiumin Huang, Wenjie Shen state key Laboratory of Catalysis, Dalian {2. of {3. {3., chinese academy of sciences, Dalian 11602., Liaoning, China [a] state key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China

The promotion effect of CO in methane dehydroaromatization was investigated using ^13.O probe molecules. By alternative injection of ^13.O to the methane feed, the distribution of ^13.xC6-xH6（x= 0-3. products changed significantly, confirming the participation of ^13.O in the reaction network. The addition of ^13.O did not change the conversion of CH4 but improved slightly the durability of the methane dehydroaromatization （MDA） reaction, which might be caused by the interaction of the dissociated oxygen species and the deposited carbon species. The ratio of ^13.xC6-xH6 （x = 0-3. varied with the time on stream, which was determined by the competitive reactions of methane decomposition and ^13.O dissociation.

关键词： ^13.O labeling methane dehydroaromatization Mo/HMCM-49 catalyst deactivation