Materials Literature
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In this brief survey, the theoretical models for nucleation of new grains in annealed cold-worked metals are reviewed in the light of recent researches in the author's laboratory. The importance of strain-induced boundary migration is gradually emerging. The role of vacancies in enhancing the mobility of grain boundar…
Eleven weak absorption peaks of Fe3+ and two broad absorptions of Cr3+ doped in synthetic yttrium-aluminium-garnets, Y3Al2A13O12, have been assigned to d-d transitions of the metal ions in octahedral and tetrahedral sites. All of these absorption peaks have 1:1 correspondence to transitions which are predicted to occu…
The anisotropic thermal expansion and compressibility coefficients of black phosphorus have been determined by high temperature single‐crystal x‐ray diffraction, by high pressure x‐ray diffraction and by neutron (time‐of‐flight) diffraction and are Ka = 1.5(2), Kb = 15.1(4), Kc = 12.1(4), Kv = 30.2(1.0) × 10−4 kbar−1.…
Ferritic stainless steels containing more than 13% chromium are subject to severe embrittlement, known as the 475° C embrittlement, when heated in the temperature range of 400–550° C. Several experimental and review papers have been published about this phenomenon concerning binary iron–chromium alloys. On the other h…
The corrosion of 3S aluminium (Al-Mn alloy) and its inhibition in solutions of phosphoric acid has been studied. The extent of corrosion increases with increase in acid concentration and with the length of the period of immersion. At 0·5% inhibitor concentration the efficiency of the inhibitors increases in the order:…
Critical-point drying of microorganisms for scanning electron microscopy can be rapidly and effectively accomplished by use of a newly described specimen holder. Up to eight different samples of spores or vegetative cells are placed between polycarbonate membrane filters in the holder and processed through solvent deh…
We investigate here the threshold behaviour of Williams domains and of the dielectric alignment in homeotropic and parallel oriented nematic films for different signs and magnitudes of the dielectric anisotropy. The theoretical predictions of the Helfrich theory are in agreement with the experiment.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation and Prediction of Excess Thermodynamic Functions of Strongly Nonideal Liquid MixturesIsamu Nagata and Toshiro YamadaCite this: Ind. Eng. Chem. Process Des. Dev. 1974, 13, 1, 47–53Publication Date (Print):January 1, 1974Publication History Published online1 May 20…
Abstract Macronet isoporous polystyrene structures are obtained by cross‐linking of dissolved polystyrene by means of bischloromethylated benzene or biphenyl. Macronet isoporous cation exchangers, irrespective of the type and amount of cross‐linking agents, can be completely saturated with the tetrabutylammonium ions.…
Nitric oxide and carbon monoxide have been used to poison a propene disproportionation catalyst prepared from molybdenum hexacarbonyl on silica. Nitric oxide is strongly adsorbed, and an effective poison, but infra-red spectra indicate that adsorption occurs on more than one type of site, so that estimates of the acti…
There has been much research and speculation recently on the nature of radiation induced defects in zirconium and its alloys, and in particular on the absence of voids at high fluences and temperatures in the range 0.3 to 0.5 T m (T m is the absolute melting temperature). Wolfenden and Farrell1 have reviewed the evide…
Abstract After a brief historical introduction the influence of curatives on the chemical structure of vulcanizates is discussed. Emphasis is given to physically important features of network structure such as crosslink density, crosslink type, and various main‐chain modifications. The significance of extra‐network ma…
The deleterious consequences of hydrogen on an engineering structure come about through an influence on either the crack initiation or the slow crack growth stage of fracture. Whether or not these two stages of fracture are affected by hydrogen will depend on a number of primary and secondary influences which severely…
The apatites are an important group of minerals ; isotypes have been synthesized that include substitutions for Ca, P and F. For Ca are included : Sr, Pb, Ba, Cd, Sn", Eu" and Mn", as well as various combinations with Na, K, Al and RE. For P are included : V, As, B, Ge, Si, S, Se, Cr, and Al, as well as CO₃ groups for…
X-Ray analysis shows that in the porphyrin monocation one pyrrole ring, probably protonated, is tilted 14° from the plane through the other three pyrrole rings by the repulsions between the inner three hydrogen atoms.
An investigation was made of the anisotropic electrical conductivity (σ‖ and σ⊥) of MBBA (p-methoxybenzylidene-p-n-butylaniline) containing tetrabutylammonium tetraphenyl-boride (henceforth denoted as AB where A+ is the tetrabutylammonium cation and B− is the tetraphenylboride anion). Alignment parallel and perpendicu…
trans-[ PtX4L2](L = PMe3, AsMe3, or SMe2; X = Cl or Br) and, except X = Br for SMe2, cis-complexes have been isolated, together with the salts Prn4N[PtX5L], Prn4N[PtI5PMe3], Prn4N[PtCl5NMe3], and [PtCl3(PMe3)3] BF4. The vibrational spectra of the complexes have been studied. 1H N.m.r. measurements have been made for t…
In binary systems, consisting of two structually similar components of which one is a liquid crystal, extrapolation of the transition curves should yield values for latent transition temperatures of the non-liquid crystalline substances. The reliability of this method of arriving at the latent transition temperatures…
The mechanism of formation of green rusts, Fe3O4, α-FeOOH, γ-FeOOH, δ-FeOOH and amorphous ferric oxyhydroxide, which are important atmospheric corrosion products of iron and steels, in aqueous solution at room temperature, has been investigated. The formation processes on which end products are determined are strongly…
Comparative evaluations of the wear resistance of isotropic pyrolytic carbons deposited in fluidized beds (Pyrolite carbons) were carried out at room temperature in distilled water. The test procedure employed a polished, rotating disk bearing on a polished flat specimen. Couples of pure and silicon-alloyed Pyrolite c…