Materials Literature
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The oscillation of domain walls caused by alternating fields is often thought to be the origin of dielectric losses. In this paper the physical nature of losses is explained by the damping of moving 90° domain walls. For frequencies up to 108 Hz the origin of damping of the wall motion is ascribed to point defects wit…
Zircaloy-steam reaction rate in flowing steam was measured in the temperature range of 900∼1,330°C. The reaction rate measured from the weight gain followed a parabolic law above 1,000°C, but it deviated from the law at 900 and 950°C. Growth rates of ZrO2 layer and ZrO2+ stabilized α-phase were also parabolic above 1,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure dependence of the Raman and infrared spectra of .alpha.-, .beta.-, .gamma.-, and .delta.-octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocineF. Goetz, T. B. Brill, and J. R. FerraroCite this: J. Phys. Chem. 1978, 82, 17, 1912–1917Publication Date (Print):August 1, 1978P…
The authors have studied transition and noble metal site NMR spectra of stoichiometric, off-stoichiometric and substituted Heusler alloys. The hyperfine fields can be analysed consistently in terms of local and transferred contributions. The transferred fields are negative at near neighbour and second neighbour to a M…
Linear stability analysis is used to show that an homogeneous system in the early ’’aging’’ stage of a first order phase transition is unstable to heterogeneous development. A detailed analysis appropriate to precipitation out of a solution is presented although only the most general features of a first order phase tr…
A description is given of the properties of plane diffraction gratings used in conical diffraction. Formulas are given for computing the direction of the diffracted orders. Experiments were performed to investigate the behavior of gratings used on conical diffraction mountings. Comparisons made with classical diffract…
Special phase gratings are described by means of which the red, green, and blue color components of colored objects are generated side by side around the optical axis in the image plane of a lens. An analysis of these color separation gratings is given, and theoretical and experimental results for some grating samples…
A green pegmatite mineral from Piona, northern Italy, originally described as a phosphate of lanthanum and cerium, has unit-cell parameters a = 6.78, b = 6.96, c = 6.48A, ..beta.. = 103/sup 0/54', in agreement with monazite. However, the unusual character of this mineral with respect to ''ordinary'' monazite is eviden…
The anodic behavior of high purity 18% Cr ferritic stainless steels, with a content from 0 to 5% molybdenum, was studied in and in solutions. The studies were complemented by Auger electron spectroscopy analysis of the films in solutions. It was found that the effect of molybdenum on the pitting potential of these all…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic analogs of the 4-Fe active sites of reduced ferredoxins. Electronic properties of the tetranuclear trianions [Fe4S4(SR)4]3- and the structure of [(C2H5)3(CH3)N]3[Fe4S4(SC6H5)4]E. J. Laskowski, R. B. Frankel, W. O. Gillum, G. C. Papaefthymiou, J. Renaud, James A. Ib…
The successive phase transitions from a prototype to an incommensurate phase and then to a commensurate phase are studied on the basis of a model thermodynamic potential where the instability of a one-dimensional representation is assumed. The model is suitable to a unified description of the phase transitions in SC(N…
The presence of coherent electromagnetic radiation has a profound effect on the Compton scattering of x rays from electronic systems. Here, two electronic systems are considered---bound electrons in atoms and an electron gas. The scattering cross section is expressed in terms of a power series in even derivatives of t…
The distribution of bacterial leucine dehydrogenase (L-leucine:NAD+ oxidoreductase, deaminating, EC 1.4.1.9) was investigated, and Bacillus sphaericus (IFO 3525) was found to have the highest activity of the enzyme. Leucine dehydrogenase, which was purified to homogeneity and crystallized from B. sphaericus, has a mol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of water-soluble undecagold cluster compounds of potential importance in electron microscopic and other studies of biological systemsPaul A. Bartlett, Barr Bauer, and S. J. SingerCite this: J. Am. Chem. Soc. 1978, 100, 16, 5085–5089Publication Date (Print):August 1…
Abstract A new version of the free‐volume theory of diffusion is used to describe polymer–solvent diffusion both above and below the glass transition temperature. Expressions are derived for the temperature dependence of the mutual diffusion coefficient and for the effective activation energy in the limit of zero pene…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe bonding capabilities of transition metal clustersJoseph W. LauherCite this: J. Am. Chem. Soc. 1978, 100, 17, 5305–5315Publication Date (Print):August 1, 1978Publication History Published online1 May 2002Published inissue 1 August 1978https://pubs.acs.org/doi/10.1021/ja00…
The order-parameter fluctuation spectrum of a chiral system undergoing a helicoidal ferroelectric $\mathrm{s}\mathrm{m}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{c}\ensuremath{-}A\ensuremath{\rightarrow}\mathrm{s}\mathrm{m}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{c}\ensuremath{-}\stackrel{\ifmmode \tilde{}…
Abstract This paper is the first in a series intended to clarify the particle nucleation mechanisms in emulsion polymerization. The theory for particle nucleation by precipitation of oligomeric radicals from the water phase is discussed and a model based on the diffusion, propagation and termination steps is presented…
High-precision X-ray measurements on crystals of the layered dichalcogenide β-MoTe2 have revealed a structural transition at approximately 250 K. The transition from the monoclinic room-temperature form is accompanied by a discontinuous change of the monoclinic angle β from 93°55′ to 90°, with substantial thermal hyst…
Molecular dynamics simulation techniques have been used to study the equilibrium configurational properties of freely moving polymer chains constructed from linked elastic spheres. The mean square end-to-end distance and radius of gyration are found to vary exponentially with chain length, and the results are similar…