Materials Literature
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A normal coordinate analysis of cellulose I has been performed for an isolated chain using a valence force field and atomic coordinates from an x−ray refinement analysis. The calculated frequencies show good agreement with the observed infrared and Raman data, while the computed potential energy distribution is compat…
A silicon powder Standard Reference Material, SRM-640, has been prepared for use as a standard in powder diffractometry. Powder diffraction measurements were performed with a tungsten internal standard and a high-angle goniometer. The measured a/λ is 3.525176. With λ(Cu Kα1 peak) taken as 1.5405981 Å, a = 5.430880 (35…
Abstract The structural formula of Kozfikov saponite (Czechoslovakia) is as follows: $N{a_{0.005}}C{a_{0.22}}{K_{0.01}}[S{i_{3.30}}A{l_{0.68}}F{e^{3 + }}{}_{0.02}][M{g_{2.50}}F{e^{2 + }}{}_{0.26}F{e^{3 + }}{}_{0.24}]{O_{10}}{(OH)_2}.$ Saturated with 6 different cations (Li, Na, K, Ca, Mg, Ba) its swelling in ethylene…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for heteropoly blues. Degrees of valence trapping in vanadium(IV)- and molybdenum(V)-substituted Keggin anionsJulianne J. Altenau, Michael T. Pope, Ronald A. Prados, and Hyunsoo. SoCite this: Inorg. Chem. 1975, 14, 2, 417–421Publication Date (Print):February 1, 1975Pu…
An apparatus is described for making transport measurements, especially thermopower, on single crystals of highly conducting organic solids. It is designed specifically for small fragile anisotropic samples such as TCNQ salts. The temperature range is 400−1.2 k. A slow ac technique is used so that stray thermal emfs a…
"The Physics of Liquid Crystals." Optica Acta: International Journal of Optics, 22(2), p. 158
ADVERTISEMENT RETURN TO ISSUEPREVArticleObservation of histidine residues in proteins by nuclear magnetic resonance spectroscopyJohn L. MarkleyCite this: Acc. Chem. Res. 1975, 8, 2, 70–80Publication Date (Print):February 1, 1975Publication History Published online1 May 2002Published inissue 1 February 1975https://pubs…
A method is presented of determining powder data from photographs. With a microphotometer the density is measured in steps of 0.01° 2θ. These data are used by a computer program. With this program the background and the noise level are determined first. After the detection of the diffraction peaks, the peak positions…
Electron and X-ray diffraction studies have identified three metastable phases in 1T TaS2. Extra reflexions are interpreted as arising from charge density waves coupled to periodic distortions modulating a trigonal lattice. These waves are incommensurate with the matrix in 1T1 and 1T2, but form a commensurate super-la…
A set of reference intensities, ki, are required for the quantitative interpretation of X-ray diffraction patterns of mixtures. Each ki was heretofore determined individually from binary mixtures of a one-to-one weight ratio. A procedure for the determination of all ki's of interest simultaneously is presented. The X-…
The localization of plastic strain into macroscopic groups of persistent slip bands has been determined on copper single crystals strain-cycled into saturation. The macroscopic bands traverse the whole cross section and undergo complete reversibility of plastic strain with load reversibility. Although overall, surface…
Abstract The Raman spectra of collagen, gelatin, and elastin are presented. The Raman lines in the latter two spectra are assigned by deuterating the amide N‐H groups in gelatin and by studying the superposition spectra of the constituent amino acids. Two lines appear at 1271 and 1248 cm −1 in the spectra of collagen…
Ceria doped with divalent or trivalent cations is a mixed conductor; conduction occurs predominantly by the motion of oxygen vacancies or by electrons, depending on the departure from stoichiometry. In order to establish the electrolytic domain at which behaves primarily as an ionic conductor with transference number…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition metal pentacoordinationAngelo R. Rossi and Roald. HoffmannCite this: Inorg. Chem. 1975, 14, 2, 365–374Publication Date (Print):February 1, 1975Publication History Published online1 May 2002Published inissue 1 February 1975https://pubs.acs.org/doi/10.1021/ic50144a0…
Polarized infrared spectra of oriented crystals of CH2=CHCOOH and CH2=CHCOOD were recorded at various low temperatures.An infrared spectrum of liquid acrylic acid at room temperature was also recorded.Assignments of the observed bands were made with the aid of infrared dichroism and isotopic frequency shift.It was fou…
We analyze, classify, and compare the relative roles of different mechanisms of dislocation dragging, including elastic and inelastic scattering of acoustic and optical phonons by a moving dislocation (phonon wind, Raman scattering, flutter effect) and phonon relaxation (thermoelastic losses, phonon viscosity, relaxat…
A classification is made of complicated impurity associates for erystals of Y3AI5O12-Lu3AI5O12: A3+ (A3+ = Nd3+, Eu3+ or Pr3+), Y3AI5O12- L3AI2Si3O12: Nd3+ (L2+ = Mg2+, Mn2+ or Ca2+) and Y3AI5O12: Sc3+-(Nd3+, Eu3+). The mechanism is investigated of formation of associations of different type by means of an analysis of…
The silver and copper crystals of an eutectic Ag-Cu alloy (71.9 wt% Ag) get a fibre-like shape by wire drawing after a high degree of deformation. The extremely thin silver and copper fibres attain a diameter of about 100 Å at a reduction of cross section η = 99.99%. Such in-situ-produced silver-copper composite wires…
The dependence of the electrical conductivity and thermoelectric power on the mean grain size in 16% Bi2Se3–84% Bi2Te3 (as n-type) and 75% Sb2Te3–25% Bi2Te3 (as p-type) solid solutions is analysed. In p-type materials, the main process by sintering is the reduction of the contact resistance between grains. In n-type m…
It has been found that adding Rh or Ru to MnBi is effective in stabilizing the high−temperature β phase (distorted NiAs structure) relative to the low−temperature α phase (undistorted NiAs structure). This effect has been observed in both evaporated thin films and bulk samples. Addition of 1 at.% Rh to bulk MnBi incre…