Materials Literature
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Abstract Computations are presented for the analytic perturbation solution for the growth of a Maxwellian impurity atmosphere round a dislocation. The kinetics of growth of these atmospheres are related to the various physical processes involved. A direct numerical technique is then described for the case when the int…
Ferromagnetic resonance measurements have been carried out on single-crystal nickel films obtained by epitaxial evaporation on NaCl under various evaporation conditions. Resonance measurements on thin films by previous investigators have yielded anomalous values of 4πM which have tentatively been attributed to stress…
Abstract It is well known that polymeric materials in general creep with increasing time under a given constant stress and that stress relaxes with increasing time under a given constant strain. Recently, theoretical studies en these phenomena have been made in detail for polyisobutylene, vulcanized natural rubber and…
The electron paramagnetic resonance of ${\mathrm{Co}}^{2+}$ in single-crystal rutile (Ti${\mathrm{O}}_{2}$) has been investigated at 3-cm wavelength and 4.2\ifmmode^\circ\else\textdegree\fi{}K. The angular dependence of the resonance pattern indicates that the ${\mathrm{Co}}^{2+}$ ion enters substantially for the ${\m…
(1962). The Temperature Dependence of the Viscosity of Liquid Metals. Nuclear Science and Engineering: Vol. 12, No. 3, pp. 436-439.
Measurements were carried out to test the validity of Heidenreich and Matheson's relation for the vertical resolution attainable in electron stereomicroscopy. Relative elevations much smaller than this relation would allow were readily detected. Considerations are advanced which indicate that if certain considerations…
This paper describes part of a programme of fundamental study of scale formation. The work described here is concerned with the initiation of scale formation at a heating surface where boiling is taking place. The crystalline ring formations first observed by Partridge (I) with calcium sulphate solution were seen usin…
Abstract The interactions between polyethylene and a number of hydrocarbon diluents were characterized on the basis of the Flory‐Huggins interaction parameter χ and the closely related heat of mixing parameter B . The evaluations of these parameters were based on Flory's statistical‐thermodynamic treatment of the effe…
Some transitions between ordered and disordered magnetic states that take place via transitions of first order are tabulated. Among these transitions are some of the order-disorder type. The theoretical basis for such a transition to occur is indicated using a simple physical model that assumes: (1) a strain dependent…
A successful electropolishing technique has been developed for preparing thin films of uranium with good transmission characteristics for electron microscopy. The technique has been applied to the study of irradiation damage in uranium, particularly the irradiation growth phenomenon. Dislocation loops are formed durin…
The problem treated is that of an infinite free plate excited symmetrically by two equal and normally opposed step point-loads on its faces. The problem is equivalent to that of the surface normal point-load excitation of an infinite elastic layer, half the thickness of the plate, overlying a rigid half-space with lub…
A study of x-ray-induced color centers in the CsCl-type alkali halides has been made at room, liquid nitrogen, and liquid helium temperatures. The gross features of this coloration are similar to those observed in NaCl-type alkali halides, namely a principal absorption band in the visible portion of the spectrum with…
The results of nuclear quadrupolar spin-lattice relaxation time ${T}_{1}$ measurements in most of the III-V compounds and germanium are presented and discussed. It is shown that the ${T}_{1}'\mathrm{s}$ may be correlated with the quadrupole interaction for a free atom and appear to be relatively insensitive to differe…
Abstract The development of spherulites in thin films has been observed. At low supercoolings they develop scalloped edges, with each scallop sector having a branched structure reminiscent of a fern frond. At high supercoolings they develop smooth circular boundaries. An x‐ray diffraction study has been made both of t…
The dehydration of kaolinite was carried out in a vacuum to evaluate the kinetics without the marked effect of water vapor. Samples of carefully fractionated particles were used and the effect of surface area was determined. At pressures in the order of 1μ of Hg the reaction was found to be diffusion‐controlled, with…
The electrical conductivity and relative fractions of ionic and electronic conductivity of single crystals of MgO were measured between 1000° and 1500°C. The results resolve conflicting observations of electronic and ionic conductivity of previous investigations in that MgO is shown to exhibit both kinds of conductivi…
Apparently healthy, unanesthetized dogs weighing 12.3 ± 1.8 kg were caused to pant by the warming effect of incandescent lamps. Panting frequency was recorded and found to be 5.33 ± 0.7 cycles/sec. The natural frequency of the respiratory system of each of the animals was then determined, the mean being 5.28 ± 0.3 cyc…
Abstract A spherulitic crystallization process can be divided into three successive stages: the formation of spherulite centers, the growth by means of crystalline fibrils with many branches extending into the melt, and finally crystallization of the intervening regions between these already crystallized fibrils. The…
The present status of soft magnetic alloys used in power generation, communication, and special devices applications will be reviewed with emphasis on future prospects for their improvement. Although the study of microscopic structure of magnetic materials has led to important advances, present and future improvements…
Alumina whiskers have been grown on single-crystal alumina substrates by heating aluminum filings, located near the crystals, to 1400°C in a stream of wet hydrogen. The whiskers grew crystallographically coherent with the substrate, and had their axes either parallel to the c axis or in one of 12 equally spaced direct…