Materials Literature
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Earlier experimental work (J. Ferguson, H.J. Guggenheim and Y. Tanabe, J. appl. Phys. 36 (1965) 1046, Phys. Rev. Letters 14 (1965) 737) on the Mn pair spectrum of KZnF 3 :Mn and the spectrum of KMnF 3 has been extended. The narrow bands of KMnF 3 and RbMnF 3 have been assigned and their abnormally high intensities est…
Article Notizen: Zur Defokussierungsabhängigkeit des Phasenkontrastes bei der elektronenmikroskopischen Abbildung was published on April 1, 1966 in the journal Zeitschrift für Naturforschung A (volume 21, issue 4).
To explain the large isotope effect on the transition temperature in KH2PO4, the tunneling motion of the protons in hydrogen bonds is considered and a theory of the phase transition is developed under the assumption that the ferroelectric behavior of this substance is due to cooperation of the ionic displacements, the…
Samples of tellurium-doped indium antimonide that exhibited solute banding when solidified in a horizontal boat under ordinary conditions showed no bands when solidified in the presence of a vertical dc magnetic field. The effect of the field was to damp the thermal convection in the molten sample to the point of supp…
The theory of particle coarsening kinetics under control by diffusion through the matrix and by phase-boundary reaction is reviewed, and extended to the case of diffusion control when the particles are closely spaced and for impurity control at the interface. For the first case, d̄=f(T,φ)t⅓, Nv=f(T,φ)t−1, where d̄ is…
The effect of volume exclusion on the mean-square radius of gyration s2 is treated by use of the empirical expression W0(s)=const s6exp[−(7/2)〈s2〉0−1s2] for the statistical distribution of s for a system of linear chain molecules unperturbed by volume exclusion. Segment interactions within the perturbed molecule are t…
Paramagnetic Fe3(PO4)2·4H2O is monoclinic, with lattice constants a=10.541±0.005, b=4.646±0.004, c=9.324±0.005 Å and β=100°25.8′±1.0′ at 298°K, with two formula weights in the unit cell. The space group is P21/a. The positions of the iron, phosphorus, and oxygen atoms, determined by Ito and Mori in 1951, together with…
The crystal structure of tetramethylammonium hydroxide pentahydrate has been determined at 25°C by an analysis of the three-dimensional x-ray-diffraction data. The unit cell is orthorhombic with a=12.57, b=10.96, c=7.91 Å and contains four formula units. The OH− ions and H2O molecules form a hydrogen-bonded framework…
The process of cratering in materials is described in terms of four phases: transient, primary, secondary, and recovery. Rod projectiles were used in an experimental study of the relative importance of each phase and its influence on final crater dimensions. Aluminum and steel rods with aspect ratios of 1/6 to 25 were…
Several aspects of x-ray scattering from thin films have been studied. A relation is presented which correctly gives the positions of the interference maxima in the scattered radiation and is shown to reduce to the Kiessig (specular) interference equation under the appropriate conditions. In particular, it is shown ex…
The gyromagnetic factor appropriate to a transition-metal salt such as KNi${\mathrm{F}}_{3}$, is inspected in detail, with emphasis on extracting information concerning $3d$-electron covalent mixing from experiment. The necessary spin-orbit and orbital Zeeman matrix elements are evaluated within the framework of Hund-…
The absorption and reflection spectra of ZnO crystals have been studied in the region of intrinsic absorption, and the data have been interpreted in terms of the wurtzite model given by Birman. Three intrinsic exciton transitions have been observed, one associated with each of the three valence bands. Several bound-ex…
The indirect optical absorption edge in silicon and germanium has been studied in the presence of shear strain. The splitting observed in the transmission spectrum is dependent on the direction and magnitude of the applied stress and on the polarization of the light with respect to the stress axis. The results have be…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Donald E. McCarthy, "Transmission of Irtran Materials from 50 μ, to 300 μ," Appl. Opt. 5, 472_1-473 (1966) Export Citation BibTex Endnote (RIS) HTML Pl…
Abstract Zu den vielfältigen Möglichkeiten der Zerkleinerung gehört auch das Desagglomerieren auf Walzenstühlen und in Knetmaschinen. Dabei werden in hochviscosen Medien suspendierte Feststoffteilchen durch Strömungskräfte beansprucht und zerkleinert, sofern die Beanspruchung die Festigkeit der Teilchen überschreitet.…
Abstract Literature on thermal conductivity of natural rubber has been critically evaluated. Best values of thermal conductivity as a function of temperature were selected, and are presented in both graphical and tabular form. An attempt was made to consult all work that could significantly affect the choice of best v…
Abstract : Estimates of the surface self-diffusion coefficients of evaporated deposits were made from (1) the spread of material into a shadow cast by the placing of an object between source and substrate, (2) the decay on annealing of the step produced in a metal film deposited onto a mica surface with a cleavage ste…
Summary The effects of varying the type and size of the aggregate on the stress-strain characteristics of concrete and micro-concrete in compression and tension are described. By applying new experimental techniques, it has been shown that the use of a larger and rounder aggregate yields a concrete which attains a low…
The phenomenon of stress relaxation, the time decrease of internal stress due to localized flow in a solid under constant uniaxial strain, is viewed in terms of present kinetic theories and available data for metals. Rate equations for shear flow, derived from molecular models of liquids and gases, are reviewed briefl…
Magnetoresistance in single crystals of iron has been studied in fields up to 50 kOe at temperatures from 1°–300°K. Iron whiskers 40–700 μ in diameter grown by the hydrogen reduction fo FeCl2 and having residual resistance ratios ρ300°K/p4.2°K from 200 to 2000 have been used for the experiments. In low fields the magn…