检索结果-南通市图书馆

Evidence for Multiple Underlying Fermi Surface and Isotropic Energy Gap in the Cuprate Parent Compound Ca2CuO2cl2

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2018年第6期35卷 84-89页

作者： Cheng Hu Jian-Fa Zhao Ying Ding Jing Liu Qiang Gao Lin Zhao Guo-Oong Liu Li Yu Chang-Qing Jin Chuang-Tian Chen Zu-Yan Xu Xing-Jiang Zhou Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049 Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 10019 Collaborative Innovation Center of Quantum Matter Beijing 100871

The parent compounds of the high-temperature cuprate superconductors are Mott *** has been generally agreed that understanding the physics of the doped Mott insulators is essential to understanding the mechanism of high temperature superconductivity.A natural starting point is to elucidate the basic electronic structure of the parent *** we report comprehensive high resolution angle-resolved photoemission measurements on Ca_2CuO_2cl_2,a Mott insulator and a prototypical parent compound of the *** *** Fermi surface sheets are revealed for the first *** high energy waterfall-like band dispersions exhibit different behaviors near the nodal and antinodal *** distinct energy scales are identified：a d-wave-like low energy peak dispersion and a nearly isotropic lower Hubbard band *** observations provide new information of the electronic structure of the cuprate parent compound,which is important for understanding the anomalous physical properties and superconductivity mechanism of the high temperature cuprate superconductors.

关键词： CuO Evidence for Multiple Underlying Fermi Surface and Isotropic Energy Gap in the Cuprate Parent Compound Ca2CuO2cl2 Ca cl

Study of Photostimulable Luminescence Materials Sr_9Ca(PO_4)_6cl_2:Eu

在线全文

学校读者我要写书评

暂无评论

Rare Metals 1989年第4期9卷 49-53页

作者： Song Qingfang China Criminal Police Institute,Shenyang 110035Wang Yanji Zhao Wei Su Mianzeng Department of Chemistry,Peking University,Beijing 100871 China Criminal Police Institute 辽宁沈阳北京大学北京

The polycrystalline Sr_9Ca(PO_4)_6cl_2:Eu has been synthesized by solid state *** reaction condition,the appropriate raw materials and their quantity used,which may affect the photostimulable luminescence (PSL),have been systematically inves- *** properties of this PSL phosphor as a material for storing and reproducing the X-ray image in computer-aided radiography have been reported briefly.

关键词： Eu PO4 Study of Photostimulable Luminescence Materials Sr9Ca Sr cl

Effect of cl^-ion on Anodic Iron Dissolution in H_2S-Containing Sulfuric Acid Solutions

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第10期9卷 945-948页

作者： Li Jing YAN Lin NIU Hat Chao LIN Wei Tao WU Shang Zhang LIU(Institute of Corrosion and Protection of Metals, State Key Laboratory for Corrosion and Protection, Chinese Academy of Sciences, Shenyang 110015Department of Chemistry, Liaoning University, S Chinese Acad Sci Inst Corros & Protect Met State Key Lab Corros & Protect Shenyang 110015 Peoples R China Liaoning Univ Dept Chem Shenyang 110036 Peoples R China

The effect of cl- ion on the anodic iron dissolution in H2SO4 solutions containing H2S has been studied by using electrochemical polarization curve measurements. The competitive adsorption for cl- and HS- ions at an anodic potential has been calculated using the CNDO/2method. The results show that a ceftain concentration of the cl- ion can be adsorbed steadily and inhibit the anodic reaction of iron catalyzed by HS-. However, when the cl- ion reaches the saturation adsorption, it begins to promote the anodic reaction of iron due tO the increased negative charge of iron atoms.

关键词： iron anodic dissolution cl H_2S, CNDO/2

RESEARCH ON TRINUclEAR MOLYBDENUM clUSTER COMPOUNDS——CRYSTAL AND MOLECULAR STRUCTURE OF （C5H7S2）3[Mo3（μ3-S）（μ2-S2）3cl7]

在线全文

学校读者我要写书评

暂无评论

Science in China,Ser.B 1983年第11期26卷 1121-1130页

作者：黄金陵商茂虞卢嘉锡 Fujian Institute of Research on the Structure of Matter Academia Sinica Fuzhou

The space group of the title crystal is Pnam. The unit cell parameters are: a=17.226（4）, b=14.306（7）, c=15.074（4）; z=4, Dobs=2.03g·cm-3, Dcalc=2.063g·cm-3. The crystal structure was solved by the heavy atom method and refined by the full-matrix least-squares until the final conventional discrepancy factor was reduced to 0.068. The results of the investigation show that the crystal consists of trinuclear Mo cluster anions [Mo3（μ3-S）（μ2-S2）3cl7]3- together with planar （C5H7S2）+ monocations, surrounding the cluster anions. In the cluster anion three Mo atoms, forming a nearly equilateral triangle （2.755（1）, 2.755（1）, 2.743（1））, are bound by a μ3-S bridging atom, while each pair of Mo atoms is bridged further by a μ2-S2 ligand. Besides, each Mo atom is coordinated to two terminal cl atoms, so that the coordination sphere of each Mo atom approaches closely a pentagonal bipyramid. In addition, a single Gl atom, not at all involved in the coordination spheres of the three Mo atom

关键词： Mo3 CRYSTAL AND MOLECULAR STRUCTURE OF C5H7S2 RESEARCH ON TRINUclEAR MOLYBDENUM clUSTER COMPOUNDS cl

The CO_2 laser-induced radical-chain reactions between CH_3CF_2H and chlorine-atom donors CF_2clCFcl_2, CF_3Ccl_3 CFcl_3 or CF_2cl_2

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1992年第3期10卷 245-252页

作者： LI, Fang-Lin SHI, Ji-Liang BI, Qi-Xiu GU, Jia-Liang JIANG, Xi-Kui Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032 Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032

The CO_2 laser induced room temperature reactions of CH_3CF_2H or another protium-donor CH_3CHclCH_3 with chlorine-atom donors (Z--cl) CFcl_2CF_2cl, CF_3Ccl_3, CFcl_3 or CF_2cl_2, have been investigated. Some of these reactions can yield two important monomers (CF_2=CH_2 and CF_2=CFcl) for fluoropolymers simultaneously. The yield dependence of these two alkenes on experi- mental conditions has been studied. A laser-initiated chain process is supported by identifica- tion of Z--H intermediates in these reactions.

关键词： CI CF The CO2 laser-induced radical-chain reactions between CH3CF2H and chlorine-atom donors CF2clCFcl2 CF3Ccl3 CFcl3 or CF2cl2 CO CH cl

STUDY ON STRUCTURE OF SULFUR-BRIDGED TRANSITION METAL clUSTERS——CRYSTAL AND MOLECULAR STRUCTURE OF （C5H7S2）3 [Mo3（μ3-S）2 （μ2-cl）3cl6]

在线全文

学校读者我要写书评

暂无评论

Science in China,Ser.B 1982年第12期25卷 1269-1275页

作者：黄金陵商茂虞刘世雄卢嘉锡 Institute of Structural Chemistry Fuzhou University Fujian Fujian Institute of Research on the Structure of Matter Academia Sinica Fuzhou

The compound （C5H7S2）3[Mo3 （μ3--S）2 （μ2--cl）3 cl6] forms dark black octahedralcrystals with the following crystallographic parameters: a=22.885（10）A, c=25.407（7）A. Thespace group is I41/α, Z=16, ρobs.=2.073g/cm3, ρcalc.=2.126g/cm3. The 1621 independentreflections with I≥3σ were collected on a CAD-4 four-circle diffractometer by means of MoKαradiation. The structure was solved by three-dimensional Patterson synthesis and refined byleast squares technique to a final discrepancy factor of R=0.056. The results of our investiga-tion reveal that the molecule consists of a trinuclear Mo cluster anion and three planar *** the cluster anion. As the core of the anion the triad of Mo atoms, possessing anequilateral triangular configuration, is linked by two μ3--S bridging atoms and three μ2--clatoms. Besides, two terminal cl atoms are attached to each Mo atom to form an octahedralconfiguration. The diamagnetism and the short Mo-Mo distances （2.556 A, 2.641 A, 2.653 A）clearly indicate the existence of Mo-Mo bonds. The anion as a whole has an idealized D3h localsymmetry.

关键词： Mo3 STUDY ON STRUCTURE OF SULFUR-BRIDGED TRANSITION METAL clUSTERS C5H7S2 CRYSTAL AND MOLECULAR STRUCTURE OF cl

RESEARCH ON TRINUclEAR MOLYBDENUM clUSTER COMPOUNDS——CRYSTAL AND MOLECULAR STRUCTURE OF （Et4N）2[Mo3（μ3-O）（μ3-cl）（μ2-cl）3cl6]·EtOH

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science in China,Ser.B 1985年第2期28卷 561-568页

作者：商茂虞黄金陵卢嘉锡 Fujian Institute of Research on the Structure of Matter Academia Sinica Fuzhou

The title crystal belongs to the monoclinic system. The space group is P21/c with unit cell parameters: a=11.379（3）, b=20.766（2）, c=14.487（3）, β=91.49（2）°, V=3519（2）3Z=4, Dc=***-3, D0=***-3. The crystal structure was solved by the heavy atom method and difference Fourier synthesis and refined by the full-matrix least-squares to a final R factor of 0.040 based on 3261 unique reflections with intensities I≥3σ（I）. The structure consists of two sots of tetraethylammonium cations and trinuclear Me cluster anions. In the cluster anion the three Mo atoms form an isosceles triangle with Mo-Mo distances of 2.601（1）, 2.608（1）, 2.642（1）, respectively, showing a strong bonding interaction between the metal atoms. One μ3-O atom and one μ3-cl atom are situated above and below the triangle respectively, binding the three Me atoms to form a triangular bipyramidal cluster core. Each pair of Mo atoms is bridged further by a μ2-cl atom situated on the Mo3 triangular plane. In addition, each

关键词： Mo3 RESEARCH ON TRINUclEAR MOLYBDENUM clUSTER COMPOUNDS Et4N CRYSTAL AND MOLECULAR STRUCTURE OF EtOH cl

同方期刊数据库

CRYSTAL AND MOLECULAR STRUCTURES OF BIS （CYclOPENTADIENYL） BIS （2,4,6-TRICHLOROPHENOXY）TITANIUM, Cp2Ti（OC6H2cl3-2,4,6）2 （Ⅰ） AND TETRAKIS（CYclOPENTADIENYL）BIS （4-CHLOROPHENOXY）-μ-OXO-DIZIRCONIUM,[Cp2Zr（OC6H4cl-p）]2O （Ⅱ）

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 1982年第4期25卷 356-366页

作者：杨清传金祥林徐筱杰李根培唐有祺陈寿山 Peking University Institute of Elemento-organic Chemistry Institute of Physical Chemistry Nankai University

The crystal and molecular structures of （Ⅰ） and （Ⅱ） have been determined from single-crystal, X-ray diffraotion data collected by counter methods. Compound （Ⅰ） crystallizes inthe monoclinic space group C 2/c with a=19.618（11） ?, b=9.356（4） ?, c=15.985（8） ?,β=128.84 （3）°, Z=4. The molecule possesses Cpoint symmetry. Compound （Ⅱ） erystallizesin the monoclinic space group P 2/a with a=8.329（2） ?, b=36.509（13） ?, c=10.647（4）?, β=96.04（2）°, Z=4. The oxo-bridge links two [CpZr（OCHcl-p）] units together withthe bond angle Zr-O-Zr of 161.1（9）°. The relatively shorter Zr-O bond lengths show the pre-sence of partial double-bond character. Both Ti and Zr atoms have d° electronic configura-tion in （Ⅰ） and （Ⅱ）. The M-O bonds of the two compounds are discussed.

关键词： Cp2Zr Cp2Ti CYclOPENTADIENYL)BIS OC6H4cl-p AND TETRAKIS CHLOROPHENOXY CYclOPENTADIENYL OXO-DIZIRCONIUM cl

Nitrosyl Complexes *** of Na[Fe(CO)_3NO]with Cp~*M(CO)_3cl(Cp~*=η~5-CH_3C_5H_4,M=Mo or W):Crystal structures of Cp~*M(CO)_2NO and Cp~*M(μ_3-NH)(μ_2-NO)(μ_2-CO)Fe_2(CO)_6

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1993年第2期11卷 151-158页

作者： SUN,Wen-Hua YANG,Shi-Yan YIN,Yuan-Qi WANG,Han-Qing State Key Laboratory of Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000YU,Kai-Bei Chengdu Center of Analysis and Measurement,Chinese Academy of Sciences,Chengdu 610041 1State Key Laboratory of Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 7300002Chengdu Center of Analysis and Measurement Chinese Academy of Sciences Chengdu 610041

Sodium nitrosylcarbonyliron reacts with methylcyclopentadienylcarbonylmetal（Mo orW）chloride in CHOH/THF at room temperature to give CpMo（CO）NO（1a）(Cp=η-CHCH)or CpW（CO）NO（1b）,[CpMo（CO）]（2a）or[CpW（CO）]（2b）,and CpMo（μ3-NH）(μ2-NO)-（μ2-CO）Fe（CO）（3a）or CpW（μ3-NH）(μ2-NO)（μ2-CO）Fe（CO）（3b）,***1a,1b,3a and 3b were analyzed by IR,NMR,MS and elemental analyses,and the crystalstructures of 1b,3a and 3b were determined by X-ray diffraction *** new clusters 3aand 3b have μ3-NH ligands which were formed by redaction of NO in the synthetic reactions.

关键词： Nitrosyl Complexes 6.Reactions of Na[Fe with Cp Cp Crystal structures of Cp and Cp Mo NO Na NH cl