Materials Literature
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The piezoelectric constants, the electromechanical coupling factors and the elastic compliance constants of Se-Te alloys are studied by the transmission circuit method and/or the mechanical resonance method. The piezoelectric constants d 11 and d 14 decrease rapidly when the Te concentration increases within the range…
ABSTRACT The flexural rigidity of the large abfrontal cilia of Mytilus has been measured with a flexible glass micro-needle. The same cilium has similar values to the flexural rigidity irrespective of the phases of beat cycle (including the recovery phase) and of the direction of force applied. The values of 3–13 × 10…
This report includes data on high temperature organic crystals, ceramics, and glasses. Additional sections include plastic materials with less heat resistance. (P.S.-PL)
A study has been made of the electrochemical behavior of titanium, nickel, and various titanium-nickel alloys, containing 2, 3.5, 4.5, 28.5, 38, and 98 wt % nickel, in an acidified (pH = 1) 3.5% NaCl solution, both at ambient temperature and at the boiling point. The anodic and cathodic polarization behavior was studi…
The initial susceptibilities of powder dimethylammonium copper (II) chloride (DMACuCl3) and tetramethylammonium nickel (II) chloride (TMANiCl3) have been measured in the ranges 1.7–91 °K and 1.6–79 °K, respectively. DMACuCl3 exhibited deviations from Curie-Weiss behavior below 10 °K. The deviations were not inconsiste…
Using the model of Oseen and de Vries, we show that phase matching of optical third-harmonic generation can be achieved in a cholesteric liquid crystal with the help of the lattice momentum. Many different collinear phase-matching conditions exist. In some cases, the phase-matched third harmonic is generated in the sa…
Internal friction and Na and K self‐diffusion coefficients for (I–X)Na 2 OXK 2 O‐3SiO 2 glasses were measured. Alkali diffusion was measured between 300° and 500°C using radioactive isotopes and a thin‐sectioning technique; internal friction was determined at room temperature to 500°C at 0.1 to 2000 Hz. Comparison of…
The resistivity and Hall effect in $n$-type EuTe single crystals containing \ensuremath{\sim} ${10}^{19}$ carriers/${\mathrm{cm}}^{3}$ were studied at $1.6<T<300$ K in magnetic fields up to 140 kOe. At temperatures $T\ensuremath{\lesssim}2{T}_{N}$, where ${T}_{N}\ensuremath{\cong}9.7$ K is the N\'eel temperature…
The antiferromagnetic phase of NiS is suppressed at pressures in excess of 20 kbar and no anomalous behavior is observed in the temperature dependence of the resistivity above the critical pressure. Single-crystal x-ray diffraction studies set a limit on the movement of the sulfur atoms in the antiferromagnetic phase…
Pressure-induced electronic transitions have been observed in a wide variety of materials. In particular, Mössbauer resonance studies under high pressure have revealed changes of oxidation state and spin state of iron as a function of pressure. These processes involve the thermal transfer of an electron to a new groun…
B. L. McMichael, W. R. Jordan, R. D. Powell; An Effect of Water Stress on Ethylene Production by Intact Cotton Petioles 1, Plant Physiology, Volume 49, Iss
The magnetic properties of both insulating and conducting single crystals of EuTe were measured at temperatures $0.4\ensuremath{\le}T\ensuremath{\le}273$ K in magnetic fields $0\ensuremath{\le}H<150$ kOe. The insulating EuTe showed the behavior expected for an Heisenberg antiferromagnet and is believed to be repres…
The statistical thermodynamics of the gas-in-glass system provides a basic model of both physical and chemical solubility. The physical solubility result is essentially equivalent to that for monatomic solubility. The chemical solubility result is dependent upon the specific system involved. The model was compared wit…
Abstract An equation is derived relating total and preferential interactions of solvent components with macromolecules in a three‐component system. Application of this equation to literature data shows that binding of non‐polar solvents to proteins parallels the unfolding of the latter. This observation is discussed i…
The effects of a change in the chemical environment of an atom in a surface region are manifested in several subtle ways on the measured Auger electron spectra. The first, a shift in the energies of the Auger electrons, is the result of charge transfer and is a measure of the valence state of an atom. Examples of this…
The transverse magnetoresistivity anisotropy in both polycrystalline and single-crystal nickel films have been measured at room, liquid-nitrogen, and liquid-helium temperatures. A correction for the demagnetization field effect has been performed on the measured data. The size effects in nickel thin films have been es…
Quantitative analyses were carried out on the infrared-to-visible conversion processes and related luminescent phenomena in Yb3+-sensitized phosphors. The analyses were based on a rate equation model and the effect of host lattice was taken into account using the Miyakawa-Dexter relations. The results were found to be…
Host lattice dependences of luminescence spectra and relaxation properties of T b 3+ are described. Reduced matrix elements relevant to the transitions are calculated and compared with observations. The spectra and the decay times of the 5 D 4 → 7 F J transitions are in qualitative agreement with the calculations. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectrometry of platinum compoundsW. M. RiggsCite this: Anal. Chem. 1972, 44, 4, 830–832Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Published inissue 1 April 1972https://doi.org/10.1021/ac60312a041RIGHTS & PERMISSIO…
Ordered phases in the Co-Pd alloy system are studied by electron diffraction, using evaporated single crystal films of the alloys with Pd content extending from 20 to 100 at.%. Two types of the ordered states are found in this system; one is the Ll 2 type (Cu 3 Au type) and exists over the range of composition of Pd b…