Materials Literature
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The electronic, e.s.r., and i.r. spectra, and some magnetic moments of a number of stable penta-ammine complexes of the copper(II) ion are reported. The spectra are shown to be consistent with a square-based pyramidal configuration for the Cu(NH3)52+ cation, but not consistent with a trigonal bipyramidal configuration…
Abstract The light absorption spectra of monoionic montmorillonite suspensions with Li, Na, K, Rb, NH 4 , Cs, Mg, Ca and Ba as adsorbed ions were studied in the wavelength range 200–800 mμ. Theoretical analysis of the spectra showed that in the visible range, only scattering is responsible for light intensity attenuat…
Linear polymer of acetylene was prepared in which the oxygen content was as low as 0.7 %. The electrical conductivity and Seebeck voltage but not the energy gap depended on the extent of oxidation of the samples. Adsorbed donor and acceptor gases affected electrical conductivity but not e.s.r. spin assay. It was concl…
A new method of measuring the charge density on a dielectric surface has been developed. An electrode is vibrated in the surface field to produce a signal that is displayed on an oscilloscope, or measured with a VTVM. A bias is then applied across the vibrating and fixed electrodes sufficient to produce zero output si…
The nucleation, early growth, and structure of Ni‐P on SnCl 2 ‐ PdCl 2 activated dielectric substrates were studied. The SnCl 2 ‐ PdCl 2 treatment was found to provide small catalytic sites on the substrate, serving as the nuclei for Ni‐P growth. The average diameter of catalytic sites was estimated to be less than 10…
Raman and infrared spectra have been measured of a number of transition-metal complexes of the form [MO2X4]n–(M = MoVI, WVI, or VV; X = F, Cl, or ½ Ox), and a cis configuration of the oxygen ligands has been found for these d0-species. The results are compared with those obtained for trans-dioxo-complexes and the díff…
Using the phase diagram and a simple solution model, a subliquidus miscibility gap was estimated for the B 2 O 3 ‐SiO 2 system. The predicted coexistence boundary, showing a consolute temperature of 520°C, was flat and symmetrical and extended across the complete binary. Gradient furnace heat treatments of selected co…
Chloramphenicol-resistant strains of Staphylococcus aureus contain an inducible enzyme which inactivates chloramphenicol by acetylation in the presence of acetyl coenzyme A. The products of acetylation are chromatographically indistinguishable from those obtained with chloramphenicol-resistant Escherichia coli harbori…
Abstract ESR spectra of cupric ions in borate, silicate, and phosphate glasses were analyzed by the LCAO MO method of Maki and McGarvey. The covalency of the B 2g π‐orbital was found to change with the bond strength of the network‐former. Particularly it reflected clearly the weakening of BO bonds in alkali borate gl…
Trap levels in thin layers (500 to 6000Å) of Al2O3 and various types of SiO2, all on Si substrates, were investigated using thermoluminescence glow curves in a temperature range from 30° to 300°C. Layers were studied which had been exposed to doses of Co60-gamma radiation up to several Mrads. Previously unirradiated S…
Abstract A method of preparation has been developed which allows the growth of large homogeneous single phase ingots of such alloy systems as GeTe‐MnTe, GeTe‐SnTe, etc. … We have measured the thermoelectric power and the thermal conductivity of both GeTe and two alloys of the system Ge 1− x Mn x Te, in the temperature…
In 1958 exposure tests were started in Sweden to gain knowledge of the natural patination and the corrosion behavior of copper and copper alloys when used outdoors. The investigation covered 36 alloys in sheet or rod form: 5 coppers, 20 brasses, 5 phosphor bronzes, 1 silicon bronze, 1 aluminum bronze, 1 cadmium bronze…
Abstract Maximum stacking fault energies for α‐type stacking faults in the b.c.c. lattice are estimated for the group Va and VIa transition metals and iron. The half widths of glissile type split screw dislocations should be in all cases at least one total Burgers vector.
The electronic spectra of a number of compounds of manganese(II) in which the metal is surrounded by an octahedral arrangement of halogen atoms have been analysed, and values for the Racah parameters, B and C, and the ligand-field parameters, Δ, calculated. The compounds include MnX2(X = F, Cl, Br, I), (MeNH3)2MnCl4,…
Abstract The magnetic properties of TiFe 2 and ZrFe 2 are investigated within their homogeneity range in dependence on the concentration. TiFe 2 is antiferromagnetic at titanium excess and at stoichiometric composition and it is ferromagnetic at iron excess. ZrFe 2 is ferromagnetic throughout the whole homogeneity ran…
Fabrication of experimental insulated-gate field-effect transistors on single crystal ZnO is described. Measured transconductance of 10 µmhos is two orders of magnitude smaller than that predicted for this structure by the Hall mobility of 220 cm2/V ċ s. Threshold voltage indicates relatively large values of surface s…
AN APPLICATION IS DESCRIBED OF THE FINITE ELEMENT TECHNIQUE TO THE ANALYSIS OF SYSTEMS REPRESENTATIVE OF PAVEMENT STRUCTURES. USE IS MADE OF A DIGITAL COMPUTER PROGRAM WHICH GENERATES SUITABLE FINITE ELEMENT CONFIGURATIONS FOR AXISYMMETRIC STRUCTURES AND ACCOMMODATES APPROXIMATIONS OF NONLINEARITY WHICH APPEAR APPROPR…
A comparison is drawn between the thermal behaviour of poly-[2,2-propane-bis-(4-phenyl carbonate)] and the model compound diphenyl carbonate. On this basis a rearrangement mechanism is suggested to account for the main chemical and physical features of the degradation of the polymer between 300 and 389°.
Spectra of some rare earth activated phosphors, where may be Y, Gd, or La, are presented. The most efficient phosphors, particularly in the matrix, are those activated by Sm +3 , Eu +3 , and Dy +3 . It is shown that has an output efficiency comparable to commercial phosphors. , when properly prepared, has an output in…
Abstract The equilibrium Ca(OH) 2 ⇌ CaO+H 2 O has been studied at pressures of steam up to 50 bars and at temperatures of up to 800° C. The dissociation pressures determined are in agreement with the data derived by some previous workers at pressures of less than one bar but they conflict with data published for highe…