Materials Literature
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When pyrophyllite was subjected to mechanical treatment by dry grinding, the alteration was greater along the c axis of its structure because reflections from basal planes (00 l ) disappeared well before those from nonbasal planes, producing anisotropic X‐ray line broadening observed on grinding. X‐ray analysis showed…
The particular phase in which a liquid crystal system will exist is that which has the lowest free energy at a certain temperature. The free energy may depend on variables such as temperature, pressure, chirality, etc. One way in which the stability of a particular thermodynamic phase, relative to its neighbours, woul…
When HF / H 2 O vapor derived from an azeotropic solution of HF / H 2 O was used to etch various oxides of silicon, the etch rates were found to have qualitatively similar dependence on the wafer temperature. However, the sensitivites of the dependence were found to vary greatly among the different oxides. Consequentl…
The specific heat (Cp) versus temperature (T) curves of aged Cu-7.8 and 9.3 at% Be alloys are measured in conjunction with transmission electron microscopy in order to study the precipitation process from a viewpoint of thermal stability of metastable phases. Heat absorptions due to the re-dissolution of G.P. zones, γ…
High temperature strength of pressureless sintered TiB2 with Cr and C additives had been investigated. The bending strength was measured for temperatures between room temperature and 1400°C in air and in argon atmosphere. The bending strength was 385MPa at room temperature and increased from 560MPa at 800°C to 620MPa…
Abstract Several workers have proposed different models for the ionization distribution function ϕ(ρz), involving features related to the interaction of electrons with matter, e.g. ionization cross‐section, stopping power, electron back‐scattering and mass absorption coefficients (MACs). A number of expressions have b…
The suspension hydration of coarse‐grained (0.07 m 2. g −1 ) tricalcium silicate (C 3 S) in relatively large amounts of water (1 g per 500 mL) was studied as a function of time (up to 48 h), temperature (10°, 25°, and 40°C), and pH (8, 10, 11, 11.5, 12). The pH of the solution was maintained with dilute HCl, and both…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical investigation of the electronic structure of the mixed-sandwich complex (.eta.5-cyclopentadienyl)(.eta.6-benzene)iron and its cationA. Le Beuze, R. Lissillour, and J. WeberCite this: Organometallics 1993, 12, 1, 47–55Publication Date (Print):January 1, 1993Public…
Luminescence from semiconducting metal–oxide single crystals can provide important insights into the nature of the surface–adsorbate bond. This study examines cathodoluminescence from a zinc oxide single crystal and changes induced by adsorption and reaction of various oxygen-containing reagents on the (0001) Zn-polar…
High- and low-spin cobalt(II) trizene 1-oxide bis(chelates) have been isolated. The low-spin complexes possess square-planar structure whilst the high-spin complexes are tetrahedral. The molecular structure of high-spin [Co(OMeN3C6H4Me-4)2] has been determined: triclinic, space group P, Z= 2, a= 7.970(5), b= 10.174(5)…
Abstract Lattice strains have been produced in cadmium telluride by grinding for different durations. X‐ray diffractograms have been obtained at different stages of grinding. The lattice constants, particle size, lattice strain and Debye‐Waller factors have been determined. From the correlation between the strain and…
Well crystallized zinc ferrite powder has been synthesized from a mixed-metal solution of ZnCl2 and FeCl2 near room temperature. A single phase of zinc ferrite was formed through the so-called green-rust structure containing Fe2+, Fe3+, Zn2+, OH– and Cl– at a temperature range of 30–60 °C, after aging for more than 2…
In situ FTIR results are presented for the electrochemical cycling of polypyrrole films containing entrapped sodium dodecyl sulfate, in aqueous sodium perchlorate and aqueous sodium carbonate solutions. In perchlorate solution, the film is oxidised in two stages, involving the formation of polarons and bipolarons; no…
This paper provides both experimental and theoretical evidence of the remarkable flexibility of B–O–X bond angles (X = Si or Ge). Single-crystal X-ray diffraction analyses of PhB(OSiPh3)2, PhB(OGePh3)2 and B(OSiPh3)3 are reported. In the compound B(OSiPh3)3, the B–O–SiPh3 units are sterically constrained and the three…
Abstract In the natrochalcite-type compounds NaCu 2 (H 3 O 2 )(SO 4 ) 2 and RbCu 2 (H 3 O 2 )(SeO 4 ) 2 the lengths of the two different hydrogen bridges vary widely: 2.44 Å and 2.70 Å in the Na-S member, and 2.60 Å and 3.03 Å in the Rb-Se member. Both structures were refined by single-crystal neutron diffraction meth…
The phase compOSitIOn, exothermal reaction energy, hydrothermal-induced phase transition and development of microstructure in aluminium phosphate cements (APCs), formed by the hydrothermal-catalyzed acid-base reaction between alumina as the base reactant and NH 2 H 2 PO 4 -based fertilizer (Poly-N) as the acid reactan…
A method is presented for predicting the thermal conductivity of low density, silica based fibrous insulators. It is shown that the method can be used to extend data values to the upper material temperature limits from those obtained from the test data. It is demonstrated that once the conductivity is accurately deter…
Relaxation of the 1A1 [graphic omitted] 5T2 spin equilibrium in acetonitrile of the complex of FeII with the multidentate pyridyl macrocyclic ligand N,N′,N″-tris(2-pyridylmethyl)-1,4,7-triazacyclodecane (tp[10]aneN3) after perturbation by a pulsed laser provides the first example of biphasic kinetics for spin crossove…
The highly asymmetric induction imparted by the iron chiral auxiliary [(η5-C5H5)Fe(CO)(PPh3)] is exploited in the preparation of homochiral (R)- and (S)-α-pentylsuccinates. Their application in the synthesis of (–)-actinonin and (–)-epi-actinonin is described.
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