Materials Literature
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The crystal structure of celsian from Jakobsberg, Sweden, (Bao rrKo ouAl, 5Si2 ouO, a : 8.622,b: 13.078, c-- 14.4ll A,B: ll5.09,spacegro up 12/c)hasbeenrefi nedusing528.a' reflections (h-t k even, / even ) and 2'72'b' , reflections (h+ k odd, / odd) > 16. The 'b' reflections were measured at one-quarter the rate of'a'…
The need for random-numbers in simulation in nuclear physics, communications, risk theory, queue systems, industrial organization and many other related and similar topics is beyond question. Sooner or later the calculation part of these problems grows beyond human powers and a computer has to be involved. When using…
A new method for Monte Carlo electron transport calculations has previously been outlined. Briefly, the method is as follows: the quantity of interest (e.g., x-ray photoemission angular distribution) is expanded in a complete set of orthogonal functions; the individual trajectories of the Monte Carlo sample are used t…
New unstable photoisomers absorbing of short wavelengths were observed for 10,10′-dimethyl-Δ9,9′-biacridanylidene, bithioxanthenylidene, bianthrylidene, and 10.10′-dihydroxybianthrylidene. A C2v symmetry structure, considerably twisted about the four single bonds of the 9,9′-ethylene unit is suggested by a CFF–π elect…
Formation and growth of modulated structure with aging were investigated for Ni-37 at%Cu-8 at%Si and Ni-30 at%Cu-5 at%Si alloys which show a typical modulated structure, by means of transmission electron microscopy, X-ray diffraction and electrical resistivity measurements. The results obtained are as follows: (1) For…
1 Method by electric wire
The infrared, Raman and n.q.r. (14N and 35Cl) spectra of the 1:1 molecular complex of 3,5-dichloropyridine with iodine monochloride are reported. All three 14N transition frequencies were obtained at 77 K using a double resonance technique. The resulting 14N coupling constant and asymmetry parameter are 2.257 MHz and…
Single-crystal magnetic-anisotropy measurements have been made over the temperature range 80–300 K on the oxygen-inactive title chelates [{Co(salen)}2], [Co(salen)]′py· and [{Co(tsalen)}2]. These five-co-ordinate species all show rhombic magnetic ellipsoids wth [{Co(tsalen)}2] being the least anisotropic. Both salen c…
Abstract Thermal dehydrochlorination of poly(vinyl chloride) was demonstrated to be capable of being maximally inhibited by triphenylmethane. Arrhenius parameters observed under conditions of full inhibition are consistent with a unimolecular loss of hydrogen chloride occurring concurrently with a radical‐chain proces…
Abstract Water‐vapor sorption by a range of biopolymers is reviewed to demonstrate the general similarities in sorption characteristics. The interaction of water and the protein wool keratin is considered in more detail and further analyzed in terms of a three‐component isotherm equation. Similar analyses have been ap…
The permittivity of PbHAsO4, CaHPO4, BaHPO4 and PbHPO4 powder pellets was measured in the temperature range between −120 and + 100°C. Infrared spectra of these substances were measured and a model for the ferroelectric phase transition in PbHPO4 and PbHAsO4 was proposed.
The crystal structure of CuBi₂O₄ has been solved to R = 0,056 by Fourier and least squares methods. Manual diffractometer data have been corrected for absorption. The cell is tetragonal : a = 8,510 (1) Å, c = 5,814 (1) Å, Z = 4, S. G. : P4/ncc. Bi-O distances range from 2,12 to 2,73 Å. The 6 s² lone pair is stereochem…
SummaryThe chemistry of the caustic soda-aluminium reaction is briefly outlined. Dissolution rates of 99.5% purity aluminium and HE9 alloys are measured and the effects of concentration, temperature, water purity, dissolved aluminium, sodium gluconate, metal composition and ageing treatment noted. Arrhenius plots for…
SummaryThe electropolishing of austenitic stainless steel in phosphoric acid and phosphoric-sulphuric acid mixtures has been studied with special reference to the formation of pits under conditions when gas is being evolved from the surface. These pits can be distinguished from other sorts of etching effect since they…
The far-infrared spectra of the layer structure compounds of the type (C n H2n+1NH3)2MCl4, n = 1, 2, 3,…, M = Cu, Cd, have been measured in the region of 10–400 cm−1 as a function of the temperature between 1 and 300 K. The rather involved spectra of the compounds investigated are due to the normal lattice modes of th…
Physical properties of the organic material tanane1 do not allow sufficiently accurate polarization measurements. As an alternative, the following order parameters were studied: spontaneous shear strain x 6, (linearly coupled to spontaneous polarization P 3), and spontaneous birefringence Δn 6, shown to be proportiona…
The accurate measurements of the properties of NH4HSO4 and RbHSO4 were carried out. A statistical theory of the ferroelectric transitions is proposed.
Resonance-Raman (r.r.) spectra are reported for a series of mixed-valence compounds of antimony. With Cs2[SbCl6]· Rb2[SbCl6], or Cs4[SbBiCl12], several overtone and combination tone progressions, in which the progressing fundamental is ν1(a1g) of the [SbCl6]– ion, have been observed on irradiation within the contour o…
Crystals of bis(ethylenediamine)mercury(II) diperchlorate, (I), are monoclinic, a= 7.754(6), b= 11.618(7), c= 7.754(6)Å, β= 100.38(3)°, space group P21, Z= 2. In the complex cation the mercury ion is co-ordinated by four nitrogen atoms (Hg–N 2.30–2.33 Å) in a distorted tetrahedron (N–Hg–N ring angles 77.2 and 78.5°).…
Three powder mixtures, each composed of four or more phases, were submitted for phase identification by x-ray diffraction. Laboratory technicians supplied tables of “d” values and of relative intensities as obtained separately and independently by use of the diffractometer, the Debye camera and the Guinier camera. The…