Materials Literature
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The preparation, X-ray crystal structures, conductivities, and preliminary spectroscopic characterization of new charge transfer salts of general formula (D)32+ P2–, where D is an organic donor and P hexatungstate (or molybdate) acceptor dianions having the Lindquist structure, are given.
Abstract Pedogenic calcite‐crystal coatings on clasts were examined in four soils along an altitudinal gradient on Kyle Canyon alluvium in southern Nevada. Clast coatings were studied rather than matrix carbonate to avoid the effects of soil matrix on crystallization. Six crystal sizes and shapes were recognized and d…
The effect of deformation-induced martensite on the tensile behavior of metastable austenitic stainless steel has been investigated on a AISI Type 301 stainless steel containing a small amount of copper using the X-ray diffraction technique and transmission electron microscopy. The formation of martensite during tensi…
An α-unsaturated ketone and acetone undergo a selective coupling to an α-unsaturated vic-diol, under the influence of a zinc–copper couple and ultrasonic irradiation in aqueous acetone suspension.
Supported reagents prepared by adsorption of chromium(VI) and manganese(VII) on alumina are capable of catalysing the aerial oxidation of organic substrates.
The authors describe the experimental testing of the accuracy of the classical and generalized (nonlinear) Preisach models of hysteresis. The experiments performed for two typical magnetic tape materials show that both models are about equally accurate when the reversal values of the magnetic field are larger than or…
The intermetallic precipitates in Zircaloy are generally considered to be of special importance for the properties of the alloy. However, basic feature of the precipitate formation, such as the solubility limits of iron and chromium in a ZrSn matrix, are still unknown. Investigations have been performed with the objec…
Clear 3/8'' Lucite rod models at a scale of 1'' = D (the native-type period), and using four different colored ribbon markers to indicate one set of 'equivalent bands' in the SLS band pattern, clearly show the possible distribution of 'holes' and staining loci in native-type fibrils. Close-packed ordered arrays of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropolyvanadates containing two and three manganese(IV) ions: unusual structural features of Mn2V22O6410- and Mn3V12O40H35-Hikaru Ichida, Kenji Nagai, Yukiyoshi Sasaki, and Michael T. PopeCite this: J. Am. Chem. Soc. 1989, 111, 2, 586–591Publication Date (Print):January 1…
Studies of a wide range of intramolecularly five-co-ordinated silicon compounds with chelating nitrogen donors have been made, with a view to obtaining further information on the details of nucleophilic substitution reactions at silicon. The crystal structure of 2-(dimethylaminomethyl)-phenyl-1 -naphthylsilane has bee…
Thin films of polyimide were prepared by spin coating the poly(amide–acid) precursor onto copper and aluminum substrates, followed by the usual heat treatment to promote imidization (curing) of the film. Films prepared on aluminum substrates were completely cured during the heat treatment, as shown by x-ray photoelect…
Measurements of the effect of heat treatment following cold work on the yield and shape memory behaviour in a NiTi alloy are reported. Tensile behaviour is found to depend on test temperature and initial structure as well as annealing temperature. Minimum values of stress required for stress induced martensite, marten…
Results from particle squashing tests designed to simulate the process of rolled in lubricant debris in rolling element bearings, are presented and showed to compare well with an earlier published theory. Measurements of the harder anvils after squashing various hard particles confirm our earlier theoretical results,…
As the wettability of solid oxides by liquid metals gives important information on the development of composite materials, metal- ceramics joinings, and the behaviour of deoxidation products in liquid metal, a large number of papers have been published. However, there are large discrepancies among the values reported.…
Monomeric and dimeric species of phthalocyanines with four, 15-crown-5-ether (1,4,7,10,13-pentaoxacyclopentadecane) voids at the 2,3 positions (ML)(where M = H2, Cu, Zn, Ni, or Co), have been studied using optical absorption and magnetic circular dichroism (m.c.d.) spectroscopies. The ready solubility of these crown e…
The concept of grain-oriented fabrication in ceramics, which utilizes anisotropy either in morphology or some specific property of the particle, is reviewed. A fabrication method, which maximizes the grain orientation, is described for Bi(4)Ti(3)O(12 ). The process utilized plate-like morphology of Bi(4)Ti (3)O(12) pa…
Two broad categories of austenitic steels are considered in this review: (a) alloys based on the Fe–Mn–C system, typified by austenitic wear resistant (Hadfield) steels and (b) alloys based on the Fe–Mn–Cr system, typified by austenitic corrosion resistant steels. Advances made in recent years in understanding and imp…
A new range of electron donor–spacer–acceptor systems has been assembled using co-ordination chemistry to link the subunits; rates of photo-induced electron transfer to the same acceptor ligand imply that tetraphenylporphyrins and octa-alkyl porphyrins have different solvent reorganisation energies.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAliphatic versus aromatic carbon-hydrogen activation and the x-ray crystal structure of [IrH(H2O)(7,8-benzoquinolinato)(PPh3)2]SbF6Maryellen Lavin, Elizabeth M. Holt, and Robert H. CrabtreeCite this: Organometallics 1989, 8, 1, 99–104Publication Date (Print):January 1, 1989P…
The excited-state dynamics of the Tm3+ ions in a singly doped crystal of LiYF4 is analysed. The Stokes fluorescence processes are interpreted by taking into account the numerous coincidences between the fluorescences emitted by the Tm3+ ions and by considering two kinds of sites. The anti-Stokes fluorescence dynamics…