Electrochemical doping of (μ-pyrazine)-phthalocyaninatoiron(II)

Galvanostatic doping of [rrmPcFe(pyz)]_n (Pc = phthalocyaninato, pyz = pyrazine)using several anions leads to well characterized compounds with the stoichiometry PcFe(pyz)X_y]_n (X = BF₄⁻, PF₆⁻, ClO₄⁴⁻, HSO₄⁻, SCN⁻ and BPh₄⁻). The stoichiometry of the doped samples was established by elemental analyses, thermogravimetric analyses (TG/DTA) and charge quantity measurements. Magnetic measurements and ⁵⁷Fe Mössbauer data show that the oxidation is mainly ligand centred. Four-probe conductivity measurements reveal increases in conductivity of up to four orders of magnitude. The increase in conductivity was accompanied with a broad electronic absorption in the infrared spectra. ¹³C CP-MAS solid-state n.m.r. spectra and X-ray powder diffraction data are also recorded.     

Nature of (001) and (00) faces and flocculation flotation of kaolinite

1　INTRODUCTIONThediasporicbauxiteresourceinChinaischar acterizedbyhighcontentofAl2 O3andSiO2 andlowmassratioofAl2 O3toSiO2 ,theratioisusually 5 8.ThediasporicbauxitewithlowmassratioofAl2 O3toSiO2 cannotbedirectlyprocessedbyBayer’stechnol ogy .ThesinteringorcombinationofsinteringandBayerprocessareoftenusedtotreatsuchdiasporicbauxite ,showingenergy intensiveandenvironmentalunfriendly[1] .ItisrequiredtoincreasethemassratioofAl2 O3toSiO2 toabove 10byphysicalseparationsothattheBayer…     

The Property of Alkylthiophosphoric Cobalt and Separation of Co(Ⅱ) and Ni(Ⅱ)

ＴｈｅＰｒｏｐｅｒｔｙｏｆＡｌｋｙｌｔｈｉｏｐｈｏｓｐｈｏｒｉｃＣｏｂａｌｔａｎｄＳｅｐａｒａｔｉｏｎｏｆＣｏ（Ⅱ）ａｎｄＮｉ（Ⅱ）ＬｉｕＸｉｎｇｚｈｉａｎｄＸｕｅＨｏｎｇ（刘兴芝）（薛红）ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，Ｌｉａｏｎｉｎｇ...     

Influence of Ca addition on valence electron structure of Mg_(17)Al_(12)

1　INTRODUCTIONMagnesiumalloyshaveemergedaspotentiallygoodcandidatesfornumerousapplications ,especiallyinautomotive ,aerospaceandelectronicindustry .Theirgoodproperties ,suchaslowdensity ,highspe cificstrengthandgooddampingcapacity ,makethemthepromisingreplacementsforotherstructuralmate rials,forinstance ,steel,castiron ,andevenalu minum[1,2 ] .Thewidelyusedmagnesiumalloysbe longtoMg Al Zn (AZ)series ,suchasAZ91(Mg 9Al 1Zn) ,whichhaveexcellentcastability ,goodroomtemperaturemechanicalp…     

Electroreduction of Co(Ⅱ) and La(Ⅲ)in UreaMelt

ＥｌｅｃｔｒｏｒｅｄｕｃｔｉｏｎｏｆＣｏ（Ⅱ）ａｎｄＬａ（Ⅲ）ｉｎＵｒｅａＭｅｌｔＹａｎｇＱｑｉｎ，ＱｉｕＫａｉｒｏｎｇａｎｄＰａｎＳｈｉｊｉａｎ（杨绮琴）（丘开容）（潘仕健）ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＺｈｏｎｇｓｈａｎＵｎｉｃｕｅ...     

Polymerization of dicarbonyl(η5-cyclopentadienyl) (η1-pyrrolyl)iron(II) : A new class of conducting polymers

Force field and semi-empirical MO calculations are used to predict the behavior of dicarbonyl(η⁵-cyclopentadienyl) (η¹-pyrrolyl)iron(II) (Fp-pyr, 1) under conditions commonly used to polymerize pyrrole. We also discuss similar calculations which were performed on a hypothetical tetramer. Details of chemical and electrochemical oxidations of 1 are presented, as well as thermal and spectroscopic analyses of the products. The product of the electrochemical oxidation does not appear to be electrically conducting, but those from the chemical polymerization have conductivities ranging from 5.2 × 10⁻⁵ to 2.5 × 10⁻¹ S/cm.     

Effect of Addition of Polytetrafluoroethylene (PTFE) and Silicon Carbide (SiC) on Properties of Electroless Nickel Alloy Coatings

IN RECENT YEARS,electroless deposition hasbecome an important technology to prepare compositematerials[1][2',especially the metallic matrix compositematerials with characteristics of Ni-P alloy andcomposite phases,and the prepared process which canbe used to design the functional materials131[41.Both theelectrolytic and electroless codeposited compositesdisplay the flexibility and potential advantagesThe ternary and even the polyalloys(such as Ni-Co-P,Ni-Mo-P,Ni-Cu-P,Ni-W-P-B)have mu…     

Preparation and characterization of bis(dimolybdo-nonatungstogermanate)lanthanates of potassium

The heteropoly complexes K12[Ln(GeW9Mo2O39)2] · nH2O (Ln = La, Ce, Pr, Nd, and Sm) were prepared for the first time and characterized by chemical analysis, infrared (IR) spectrum, ultraviolet (UV) spectrum, X-ray powder diffraction, and thermal analysis. IR, UV spectra, and X-ray powder diffraction studies show that the structure of the heteropoly complexes is a square antiprism consisting of eight oxygen atoms of two GeW9Mo2O398-, heteropolyanions and a lanthanide ion. The thermostability of heteropoly complexes is lower than that of saturated Keggin structure dodecatungstogermanate.     

Modeling of Fracture Toughness of Electroless Nickel (EN) Coatings

INDENTATION TEST is one of the methods forestimate fracture toughness of brittle coatings.According to this method,fracture toughness,KC[MPa.m],can be determined by the followingrelation[l,2]:(1)where P is the applied load[N],a the half diagonal ofthe indent[mm]and U the generated crack length alongeach tip of indenter[p.m].If the other cracks appeararound the indent,so U is definded an equivalent cracklength by dividing by4the total crack length,!,[!]:(2)where has a linear relation to…     

Effects of Microaddition of Ce on the Induced Magnetic Anisotropy of Amorphous Fe_(78)Si_9B_(13)

Controlling the magnetic anisotropy ofmagnetic material is extremely important forany technological applications.Fe_(78)Si_9 B_(13)amorphous alloy has been chosen for investi-gation.Although the alloy might be a goodsoft magnetic material,it might not be ideal ifthe quenching processing is carried out directly     

Infrared Spectra of La_(0.65)Ba_xMnO_(3-δ) Oxides

l 71liv t[.olk li.us,/illun(}iall) suP)orled b} lhe Trans--Cei1lDrJ Foundalion ()j' lhe Mu(f'tlIioiIal MiIli.vIF1 t)/' China an(l bylhe N'IIit)nal NIlur(Il ScIi.ncc Found'l/it)n '1f Chl)la.1* C()rresponding auth()r E-l11ailf Jthu @ sdu.edu.cn1 IntroductionRecently, colossal magnetoresistance CMRin perovskite manganese oxides La,--,A,MnO,with an Mn3 /Mn4 mixed valence has becomea topic of considerable interest[l--3]. Theseoxides exhibit semiconducting behavior in theparamagnetic …     

Extraction of aurum(III) with thiophosphate

1 Introduction Di-(2-ethylhexyl)monothiophosphoric acid is the extractant of thiophosphate type, which is abbrevi-ated to D2EHMTPA, and gold is widely used in aviation, electronics, chemical industry fields and currency exchange owing to its special chara…     

Extraction-chromatographic Separation of Microamount of Indium(Ⅲ) with DMH(MP) Resin and Its Analytical Application

The optimum conditions for extraction-chromatography using di-(l-methylheptyl) methylphosphonateresin to separate indium(Ⅲ) from its coexisting metal ions were studied. A procedure for extraction-chromatographic separation and spectrophotometric determination of indium has been developed. This proce-dure gives more clear-cut separation and higher accuracy and reproducibility than ordinarily used separationby solvent extraction with butyl acetate. Besides, it can be used to separate and determine cadmiumsimultaneously.     

Identification of Complex Ions of Nb(V)in FLINAK-O~(2-)System by Infrared Spectra

The FT-IR spectra for K_2NbF_7-FLINAK-O~(2-) solution were measured and compared with the spectraof crystalline K_2NbF_7 and K_2NbOF_6.The results show that the niobium fluoro-complex and/oroxyfluoro-complex ions are presented in these solutions.NbF_7~(2-) complex ion is the predominant species inNb(V)-FLINAK solution(not considering oxide impurity).The influence of O~(2-) on the oxyfluoro-complexions shows that NbOF_6~(3-) as a stable monooxyfluoro-complex anion presented in FLINAK-O~(2-) systemsand the number of NbOF_6~(3-) species are increased with increasing of O~(2-) when molar ratio of O~(2-)/Nb(V)is less than 1.     

Contents of Vol.3(1993)

Geology and Mining EngineeringNO·P喇Energy absorPtion of roek fragmentation under imPulsive loads with different wave forms …“.……”””‘二”“··…”’‘·“···········……Li,Xibing Lai,Haihui Gu,Desheng(1)(l)几Fraetal dimension as morPhology and size Parameters of fraetured Partieles of roek ”’‘”’‘’“’“‘”’‘”‘””‘””‘”””“””“””’‘’‘””””’“·”’“‘Li,GOnbo Xu,Xiaohe(l)(6)The develoPment of a mieroeomPuter Program for the three一di…     

Codepositon of Nanodiamonds with Chromium(Ⅲ)

This paper studied the dispersion of Detonation Nano-diamond(DND)in acid medium,then well dispersed DND suspension with different concentrations were added to the trivalent chromium electrolyte.The chromium and chromium-nanodiamond composite coatings were prepared by composite plating process.Scanning electron microscopy(SEM) confirmed the presence of composite coatings and Energy Dispersive X-ray Analysis(EDX)revealed the composition,the effect of coating time on microhardness of chromium coatings and chromium-nanodiamond coatings were disscussd.It is found that the addition of nanodiamond increases the microhardness of the coatings.When the concentration of DND in electrolyte is 2.0-3.0 g/L,the plating time is about 15-20 min,the maximum hardness is obtained.     

Electrochemical properties of M1Ni_(3.5)Co_(0.6)Mn_(0.4)Al_(0.5)–x wt%Mm_(0.89)Mg_(0.11)Ni_(2.97)Mn_(0.14)Al_(0.20)Co_(0.54)composites

In order to improve the overall electrochemical properties of AB5-type storage alloys, the new type composite alloys M1Ni3.5Co0.6Mn0.4Al0.5–x wt% Mm0.89-Mg0.11-Ni2.97Mn0.14Al0.20Co0.54(x = 0, 5, 10; M1 means mischmetal) were prepared by means of ball milling. The composite alloys are shown to be single La Ni5 phase by X-ray diffraction(XRD) patterns. The maximum discharge capacity slightly increases from 315 m Ah g-1for M1Ni3.5Co0.6Mn0.4Al0.5to 324 m Ah g-1(x = 5) and325 m Ah g-1(x = 10). The addition of AB3-type La–Mg–Ni-based alloy has a positive effect on the cycle stability.With the addition of Mm0.89Mg0.11Ni2.97Mn0.14-Al0.20Co0.54 alloy, the exchange current density(I0), the limiting current density(IL), and the diffusion coefficient of hydrogen(D) of the alloy electrodes increase, leading to a corresponding improvement of the high rate dischargeability.     

Phases in the crystallization process of Zr_(65)Al_(7.5)Ni_(10)Cu_(17.5)metallic glass

The crystallization process of metallic glass Zr65Al7.5Ni10Cu17.5, (atom fraction in %) were studied by transmission electron microscopy and X-ray diffraction. Two stages of crystallization process, which are indicated by the two exothermic peaks in the differential scanning calorimetry diagram, were studied separately. It is found that the phases in the various stage of the crystallization are different, In the first stage, it consists mainly of tI-CuZr2 and tP-Al2Zr3 phases, between which a definite orientation relationship is found. While in the second stage, in addition to the above phases, phase hP2-Al2NiZr6 and phase hP3-α-Zr appear, between which another orientation relationship is also found. At the same time, a comparison is made based on the study of the phases exist in the arc-melted master ingot. The lattice parameters of the identified phases were determined and some interesting similarities were found. According to these similarities, all the phases were classified into two groups. The fi     

Effects of rapid quenching on microstructures and electrochemical properties of La_(0.7)Mg_(0.3)Ni_(2.55)Co_(0.45)B_x(x=0-0.2) hydrogen storage alloy

1 Introduction Ni-MH batteries have been used widely by virtue of several of their advantages, such as high capacity, capable of performing a high rate charge/discharge, high resistance to overcharging and over-discharging, a long cycle life, environment…     

Alloy Design of Gamma(TiAl)Alloys

ＡｌｌｏｙＤｅｓｉｇｎｏｆＧａｍｍａ（ＴｉＡｌ）ＡｌｌｏｙｓＹｏｕｎｇ－ＷｏｎＫＩＭ（ＵＥＳ，Ｉｎｃ．，Ｄａｙｔｏｎ，ＯＨ４５４３２，ＵＳＡ）Ａｂｓｔｒａｃｔ：Ｕｎｂａｌａｎｃｅｄｐｒｏｐｅｒｔｉｅｓｆｏｒｂｏｔｈｆｉｎｅ－ｇｒａｉｎｅｄｇａｍｍａａ...