Browsing 材料学院－已发表论文 by Issue Date
Now showing items 1-20 of 2359
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THE GLASS CERAMIC ROUTE TO HIGH-TC SUPERCONDUCTORS IN THE BI-CA-SR-CU-O SYSTEM
(1989)A superconducting ceramic of composition Bi1.5CaSr1.5Cu2Ox has been prepared by the glass-ceramic route by melting in platinum, quenching between aluminium plates to form a glass then heat treating in air at 824 degrees ... -
PROCESSING AND PROPERTIES OF CERAMIC FIBERS, WITH EMPHASIS ON SILICON-CARBIDE
(1990)The properties and thermal stability of high strength ceramic fibres are reviewed. Alumina and silicon carbide fibres show loss of strength at temperatures above 1000-degrees-C due to grain growth phenomena combined with ... -
[Ag_3(μ_3-Cl)_2(dppm)_3]ClO_4晶体的结构
(1990-10-28)[Ag_3(μ_3-Cl)_2(dppm)_3]ClO_4 晶体属单斜晶系。空间群 P2_1/n;a=1.155(9),b=2.752(4),c=2.296(4)nm;β=102.8(1)°;V=7.110 6 nm~3。分子骨架为一不对称的三角双锥体,三个Ag原子以Cl原子为桥连接起来。 -
[Ag_2(dppm)_2(Py)_2Cl]ClO_4的晶体结构
(1991-05-31)<正> dppm(dppm=Ph2_PCH_2PPh_2)是易与金属形成多核络合物的配体,将它与AgClO_4以相同摩尔比溶于吡啶,静置后析出[Ag_2(dppm)_2(Py)_2Cl]ClO_4络合物的无色晶体。选取单晶在ENRAF-NONIUS四圆衍射仪上测得晶体学数据为:空间群P2_12_12_1; -
双核银络合物[Ag_2(dppm)_2(Py)_2(μ-Cl)]ClO_4的合成与结构
(1991-07-02)<正> 二-(二苯基膦)甲烷(dppm)是一种易与金属形成多核络合物的有机膦配体。我们用dppm作为配体合成了一系列银的多核络合物,并对其结构进行了研究。本文报导了其中一个双核化合物[Ag_2(dppm)_2(Py)_2(μ-Cl)]ClO_4的合成及晶体结构、分子结构的测定。 -
CRYSTAL AND MOLECULAR STRUCTURES OF [Ag_2 (dppm)_2(Py)_2 (μ-Cl)]ClO_4
(1991-11-12)<正> It is acknowledged that diphenylphosphinomethane (dppm=ph_2PCH_2Pph_2)is a phosphine ligand which is inclined to form polynuclear metal complexes by reacting with metal ions. The title complex was prepared by adding 1 ... -
膦桥多核银络合物[Ag_4(dppe)_3(NO_3)_4]的合成与结构
(1991-12-27)<正> 膦桥过渡金属络合物和簇合物由于独特的结构特性和催化性能而引起人们的重视,许多这类的化合物已被合成和表征,但相应的银化合物的研究则较少。近年来,我们利用双齿膦配体dppm(Pb_2pCH_2PPh_2)和dppe(Ph_2PCH_2CH_2PPh_2)合成了一系列新型的膦配体银络合物。这些双齿膦配体结合硝酸根、氯离子和吡啶等配体以多种方式与银原子配位,呈现了丰富的配位结构特征。本文报导另一个新的dppe多核银络合物的合成与晶体结构 ... -
EFFECT OF OXYGEN CONCENTRATION ON THE PHOTOLUMINESCENCE SPECTRUM OF CDIN2O4 FILMS
(1992)The photoluminescence of transpartent and conductive CdIn2O4 thin films formed by rf sputtering has been investigated as a function of oxygen concentration. The photoluminescence peaks show a "red shift" as the oxygen ... -
ANODIC-OXIDATION OF NORCAMPHOR IN AQUEOUS-ELECTROLYTES
(J PRAK CHEM-CHEM ZTG, 1992)Norcamphor (1) was anodically oxidized at Pb/PbO2 anodes in 1 M . H2SO4, MeCN/H2O (V/V = 1/1). 3-Oxocyclopentaneacetic acid (3) and oxabicyclo[3.3.0]octan-3-one (4) were obtained with material yields up to 76% and 42%, ... -
ANODIC-OXIDATION OF 1,3-CYCLOHEXANEDIONE TO 1,2,3-CYCLOHEXANETRIONE
(CHEM LETT, 1992-04)1,3-cyclohexanedione can be electrochemically oxidized in aqueous sulfuric acid at platinum to the 1,2,3-cyclohexanetrione. Yields of about 76% and current efficiencies up to 54% were found. -
POSITRON-ANNIHILATION STUDIES OF HYDROGEN-INDUCED DEFECTS IN POST-DEFORMATION HYDROGEN-CHARGED POLYCRYSTALLINE COBALT
(1993)By means of Doppler broadening lineshape parameter measurement, the hydrogen-induced defects and their recovery behaviour in post-deformation hydrogen-charged polycrystalline Co are studied. The measured activation energy ... -
STUDY ON THE GAS-SENSITIVE EFFECT OF CDIN2O4 THIN-FILMS
(1993)Transparent and conductive CdIn2O4 (CIO) thin films are prepared by rf reactive sputtering from a Cd-In alloy target in Ar + O2 mixtures. The sensitivity of CdIn2O4 thin film sensors to the LP, CO, H-2, and C2H5OH gas ... -
ON THE POSITIONAL REACTIVITY ORDER IN THE SULFONATION OF PHENYL-SUBSTITUTED AND NAPHTHYL-SUBSTITUTED NAPHTHALENES WITH SO3
(1994)The sulfonation of 1- and 2-phenylnaphthalene, 1,1'- and 2,2'-binaphthyl, and that of the 2,2'-dihydroxy, 2,2'-dimethoxy and 2,2'-dimesyloxy derivatives of 1,1'-binaphthyl with SO3 in dichloromethane as solvent was studied ... -
ON THE POSITIONAL REACTIVITY ORDER IN THE SULFONATION OF BIPHENYL AND A SERIES OF OXY DERIVATIVES
(1994)The sulfonation of biphenyl (1) and its 2- and 4-methoxy, 3,3'- and 4,4'-dimethoxy, and 4,4'-dimesyloxy derivatives with sulfur trioxide in dichloromethane as solvent at 22 degrees C has been studied. Sulfonation of biphenyl ... -
STUDY OF TERNARY (TI,AL)N THIN-FILMS PREPARED BY ION-BEAM MIXING
(1994)A photochemistry study on nitrous oxide making use of site-selective excitation of terminal nitrogen, central nitrogen, and oxygen 1s-->3pi excitations is presented. The resonant Auger decay which takes place following ... -
AROMATIC SULFONATION 123 ON THE POSITIONAL REACTIVITY ORDER IN THE SULFUR-TRIOXIDE SULFONATION OF BENZENE, HALOGENOBENZENES, HALOGENONAPHTHALENES, AND CHLOROANTHRACENES
(1994)The reaction of sulfur trioxide with benzene, the four halogenobenzenes, and six halogenonaphthalenes in dichloromethane as solvent, and with four chlorinated anthracenes in nitromethane as solvent, has been studied by ... -
THE POSITIONAL REACTIVITY ORDER IN THE SULFUR-TRIOXIDE SULFONATION OF BENZENE AND NAPHTHALENE DERIVATIVES CONTAINING AN ELECTRON-WITHDRAWING SUBSTITUENT
(1994)The reaction of sulfur trioxide with derivatives of benzene and naphthalene containing an electron-withdrawing substituent, viz.-SO3H, -SO(2)Ph, -NO2, -CHO, -COPh, -CO2H, and -CO(2)Me, in dichloromethane as solvent at ... -
PH-DEPENDENT HYDROLYSIS AND DRUG-RELEASE OF CHITOSAN/POLYETHER INTERPENETRATING POLYMER NETWORK HYDROGEL
(1994-06)This paper describes a novel hydrogel based on crosslinked chitosan with glutaraldehyde interpenetrating polyether polymer network. The gel can hydrolyse in acid at 37-degrees-C due to the cleavage of imine bonds within ...