Materials Literature
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An experimental study of ionic thermocurrents in doped LiF, NaCl, KBr and KI has been carried out in order to study the dependence of the activation parameters with the ionic radius of the impurity R i . A simple model, which includes lattice distortion around the impurity, has also been developed. This model can expl…
The absolute strengths of the exponential absorption tails of amorphous semiconductors can be correctly predicted from the band-to-band absorption spectra and the exponents of the tails only. This result shows that the tails are due to transitions between band-derived states, and that the mechanism giving rise to thes…
Abstract Observations have been made on medium- and large-sized platelets in a natural type Ia diamond. Attempts have been made to detect any regularity in the structure of the platelets by means of electron diffraction, but none was found. The displacement associated with the platelets has been determined to be extri…
Abstract Most natural diamonds contain nitrogen as the main impurity. In some rare diamonds (termed type lb) the nitrogen is mainly present as single substitutional atoms. However, the large majority of diamonds (termed type Ia) contain the nitrogen atoms in various forms of aggregate. The different types of aggregate…
Abstract The constituent molecules of thermotropic liquid crystals invariably contain an aromatic core to which is attached one and often two n-alkyl chains. Nuclear magnetic resonance investigations have revealed that the chain does not exist entirely in an all-trans configuration and that the orientational order of…
Abstract The temperature‐ and pressure‐dependent equilibria for the addition of an extra N , N ‐dimethylforrnamide (DMF) or trimethylphosphate (TMP) ligand onto [Nd (DMF) 8 ] 3+ ‐ and [Nd(TMP) 6 ] 3+ ‐species respectively have been measured by visible spectrophotometry. Complementary NMR. studies on other lanthanide i…
Abstract The mechanism of anodic dissolution and hence of corrosion of W in alkaline solutions (NaOH, Na 3 PO 4 ) has been investigated by measuring anodic Tafel lines by the galvanostatic technique, and calculating both the Tafel slope b and the effect of pH on anode potential as diagnostic criteria for the mechanism…
Photoluminescence measurements were carried out to study the annealing effect of Zn-doped p-type InSe. The diffusion constant of Zn atom along the c -axis in InSe was estimated to be D =2.7×10 7 exp (-2.5 eV/ k T )cm 2 s -1 from the depth profiles of the 1.17 eV emission peak intensity. The isochronal annealing behavi…
New nonstoichiometric cesium bromo aurates(I,III) Cs 1+x (AuBr 4 )(AuBr 2 , Br 3 ,Br) x have been synthesized, in which the almost equally shaped anions AuBr 3 - and Br 3 - can interchange themselves. The compounds crystallize in a disordered cubic perovskite structure with a = 547.5 pm or in a tetragonal superstructu…
X-ray mass attenuation coefficients for polycrystalline samples of copper have been measured with a high-precision energy-dispersive method. Estimates of the scattering contributions to the attenuation coefficients are made. The photoelectric coefficients deduced from the experimental results are compared with theoret…
Zircaloy cladding chemical reactions with coolant water and UO2 fuel at elevated temperatures under a reactivity initiated accident (RIA) condition were studied from a metallurgical point of view on the basis of the nuclear safety research reactor (NSRR) experiments. The cladding-fuel chemical reaction was extensively…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConcerning the preparation of optically pure N-(thiocarboxy)-L-aspartic anhydrideFredric J. Vinick and Stanley JungCite this: J. Org. Chem. 1982, 47, 11, 2199–2201Publication Date (Print):May 1, 1982Publication History Published online1 May 2002Published inissue 1 May 1982ht…
Polythiourethane polymers were synthesized from a few glycol polythioglycolates and TDI or MDL Castor oil tristhioglycolate, a new trithiol, was tried as a crosslinking agent. Mechanical and solvent resistance properties of the cured products are reported.
IGSCC of 13%Cr and 18%Cr Ferritic stainless steels with various carbon, nitrogen, and titanium contents, has been studied in high temperature aqueous environments. Conventional ferritic stainless steels became susceptible to IGSCC in high temperature water irrespective of the existence of chloride ions, when they were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical properties of water-soluble porphyrins. 1. Equilibriums between some ligands and iron(III) tetrakis(4-N-methylpyridyl)porphyrinD. Weinraub, P. Peretz, and M. FaraggiCite this: J. Phys. Chem. 1982, 86, 10, 1839–1842Publication Date (Print):May 1, 1982Publication Hist…
Estimation of gap conductance in nuclear reactor fuel rods requires values for thermal accommodation coefficients of several gases on Zircaloy, uranium-dioxide, stainless steel, and other surfaces. These values for Zircaloy-2 have now been obtained by observing cooling rates of a Zircaloy sphere suspended in the sever…
Fine Ce‐Y oxide powders were prepared by coprecipitation of the carbonate, followed by calcination at 620°C. Hydrolysis of trichloroacetic acid was used to precipitate most of the material from a homogeneous solution; addition of ammonium bicarbonate and ripening of the precipitate were used to increase the yield to 6…
Abstract The corrosion behaviour of high manganese (19.8 – 32.5%)aluminum (7.1 – 10.2%) austenitic steels in different aqueous solutions has been examined. Potentiodynamic tests in 1 N sulphuric acid solution show high current densities either in the active or in the passive region and the formation of a thick film wh…
Transmission electron microscopy is used to characterize the hole-formation process due to laser writing in evaporated and sputtered Te thin films and in a Se-Te bilayer. Bilayers, with Se as the top layer, combine the effect of an antireflective coating with protection against oxidation and provide the advantage of a…
Abstract Anodic protection makes it possible to keep materials which can be passivated in a “passive” state or to bring them into this state, even in unfavourable conditions. With sulphuric acid concentrations of 93–99% this method permits the use of inexpensive, stainless austenitic steels, e.g. 1.4541 and 1.4591, at…