Materials Literature
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Electrochemical lithium insertion into W18O49 has allowed the determination of the existence of a range of intercalated phases, LixW18O49. For x < 22 the phases form through an intercalation reaction and four single-phase regions are detected: x= 0–2.6, 3.4–10, 11–15, 15.5–22. In the last of these composition ranges a…
Homologues series of some derivatives of 3,5-(4-substituted phenyl)-1,2,4-oxydiazole were synthesized and their phase behavior studied. Introduction of the pentagonal heteroaromatic ring leads to significant changes in mesomorphic behavior in comparison with analogous compounds containing the phenyl ring. The synthesi…
The electric field emanating from the surface of a poled ferroelectric can control the conduction properties of an overlying semiconducting film; this combination of materials can thus serve as a non-destructive readout, non-volatile memory device. Here we will describe a variety of experimental studies of these devic…
The thermal decomposition course of the MnII oxysalts Mn(NO3)2·4H2O, MnC2O4·2H2O and MnCO3 has been examined in different gaseous atmospheres by thermogravimetry and differential thermal analysis. The solid-phase decomposition products at some selected temperatures were characterized by various bulk and surface analyt…
Cyanocobalamin has been modified to afford a strapped hydrophobic vitamin B12 by introducing a 1,3-phenylenediacetyl moiety into the peripheral site of the corrin's B ring. The modified complex was characterized by various spectroscopic methods and cyclic voltammetry in comparison with the corresponding data for a sim…
A series of neutral osmium(VI)–oxo complexes having mesityl (mes) and cyanide ligands have been prepared and the crystal structures of [OsVI(py)2(CN)2(O)2](py = pyridine), [OsVI(tmen)(CN)2(O)2](tmen =N,N,N′,N′-tetramethylethylenediamine), [OsVI(mes)2(phen = 1,10-phenanthroline)] and [OsVI(mes)2(tmen)(O)2] determined.…
The characteristics of a field effect transistor with a lithium niobate gate insulator are reported. Shifts in the gate characteristics consistent with polarization switching have been observed. Comparisons with the results of some of the recently published theoretical models for ferroelectric gate transistors are mad…
The mixing enthalpy xH m of the liquid system Fe-Zr was measured in the Zr-rich range at 2180 K up to x Fe = 0.57 and at 2280 K up to x Fe = 0.58. Under the assumption of the associate Fe 2 Zr the temperature dependence determined can be described with the regular associate model. Based on the experimental data the fo…
The development of liquid metal breeder blankets for fusion reactors has been performed in the Forschungszentrum Karlsruhe as a part of the European fusion blanket development program with the aim to select the two most promising concepts in 1995 for further development. In this report are described the designs of sel…
The borate Ba 2 Ca(B03) 2 has been prepared and its structure determined by single crystal X-ray diffraction methods. It crystallizes in the monoclinic space group C2/m (#12) with a = 9.362(2), b = 5.432(2), c = 6.635(2) , = 119.38(1), and V = 302.6(1) A 3 . The structure was determined from 762 unique reflections and…
The volume resistivity and electromagnetic shielding properties of “Woodceramics” made of porous carbon material were investigated for the purpose of developing a new shielding material.The measured values of volume resistivity depended on the burning temperature, and changed from 1010Ω·cm to 10-2Ω·cm with increasing…
HVDC cables play an important role in a growing number of HVDC links. For almost all of these cables, mass impregnated paper is used as electrical insulation. The electrical conductivity of this insulation is given by a commonly used empirical formula. This formula takes into account the temperature and stress depende…
A stepwise peroxide initiated degradation of a PRO-FAX reactor grade polypropylene by reactive extrusion was compared with a single step degradation process. Measured properties of the polypropylene and the degraded products included shear and intrinsic viscosity, melt flow index, melting and crystallization temperatu…
Poly(ethylenc terephthalate) (PET) fibres having a wide range of structures and morphologies were prepared by heat-setting commercial PET yarn at fixed temperatures between 100 and 255°C under two conditions, i.e. while the yarn was free to relax and when it was held taut at constant length. The structural and morphol…
As a probe of physical chemical properties of the intracellular environment, we measured 39K NMR transverse relaxation rates in concentrated cell slurries of Escherichia coli K-12 grown in minimal medium over a range of osmolarities (from 0.1 to 1.0 OsM) and after plasmolysis. The 39K transverse relaxation at a resona…
Reaction of octahydridooctasesquisiloxane with Co2(CO)8 in hexane affords the complex [Si8O12H6]{Co(CO)4}2 which on pyrolysis at 300 °C in vacuo gives nanoparticulate Co2C encapsulated in an amorphous siliceous matrix; the magnetic coercivity of this material is 3.5 kOe.
Ge4S9(C3H7)2NH2(C3H7)NH2(C2H5) consists of chains of corner-linked adamantane units with a composition of [Ge4S9]2– which are separated by two dipropylammonium (DPA) cations; the first reported chain-like structure of [Ge4S9]2–.
Among the tens of thousands of species of protists recognized today, a goodly number are known as 'ambiregnal" because of their past treatment both as algae and as protozoa, which caused their names to fall under the jurisdiction of both
In the ageing of insulating materials by partial discharges, physical, chemical and electrical factors enter together into play. The paper aims to provide a general overview on the subject, especially for the physical and chemical phenomena, using information obtained from studies carried out with air corona discharge…
The structure of benzene solutions of Ga[GaCl4] and Ga[Ga2Cl7] has been investigated by 13C and 71Ga NMR, Raman spectroscopy and liquid X-ray scattering (LXS). Assignments of the vibrational spectra are based on a reinvestigation of the liquid Ga–GaCl3 system. The results for the Ga[GaCl4]–C6H6 system are in agreement…