Materials Literature
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Sharp-line fluorescence, paramagnetic resonance in the ground state, and optical absorption due to ${\mathrm{Mn}}^{4+}$ in $\ensuremath{\alpha}$-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ have been observed (analog of ${\mathrm{Cr}}^{3+}$). The ${\mathrm{Mn}}^{4+}$ valence state is obtained by charge compensation with ${\m…
In the determination of the liquidus, solidus, and subsolidus of the system MgO‐MgAl 2 O 4 the limits of the solid solution of A1 ions in periclase and Mg ions in spinel were measured. By using both X‐ray diffraction and optical techniques, the maximum periclase solid solution was found at 82 wt% MgO, 18 wt% A12O3 (9.…
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The infra-red absorption spectrum of two natural Type IIb semi-conducting diamonds has been measured by high resolution grating spectroscopy in the range 0.1 to 0.7 eV and at temperatures from 70° to 293 °K. The various absorption features (observed in much greater detail at low temperature than hitherto) were as foll…
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Abstract Oriented films of 4‐ O ‐methylglucuronoxylan from several sources were prepared by hot stretching acetyl derivatives. The resulting oriented samples could be converted to crystalline xylans without destroying the orientation. Infrared spectra of the oriented samples were recorded using polarized radiation. Ba…
A complex variable method for evaluating the strength of stress singularities at crack tips in plane problems and plate bending problems is derived. The results of these evaluations give Irwin’s stress-intensity factors for plane problems and analogous quantities for bending problems, a form familiar to the practition…
The room temperature reflectivity of BaTi${\mathrm{O}}_{3}$, SrTi${\mathrm{O}}_{3}$, and Ti${\mathrm{O}}_{2}$ has been measured from 5000 to 70 ${\mathrm{cm}}^{\ensuremath{-}1}$. These data have been analyzed by the Kramers-Kronig method and by classical dispersion theory. All of the infrared-active fundamental vibrat…
Mössbauer spectra were obtained for the following coordination compounds: iron phthalocyanine, ferrocene, iron carbonyl, iron III acetylacetonate, and iron II acetylacetonate dipyridine; for the following complex ion salts iron II trisphenanthroline chloride, iron III EDTA (monosodium salt), iron II EDTA, hemin, ferri…
An analysis of the equation TM=T0 (n+a) / (n+b) is made in order to determine the convergence temperature T0 of the melting temperatures of the n-paraffins from C44 to C100. A good fit is obtained using T0=414.3°K, a=—1.5, and b=5.0. This value of T0 (414.3°K=141.1°C) has an estimated total uncertainty of ±2.4°K and i…
Abstract Numerical solutions for the transmitted and diffracted wave intensities when electrons pass through a thin foil containing a dislocation, are obtained by the use of a previously derived formulation of dynamical diffraction theory which takes account of anomalous absorption effects. The results for a variety o…
Two types of fabric, a tightly constructed worsted and a woolen of more open con struction, have been milled in laboratory stocks. Curves of (i) shrinkage in both warp and weft directions, as a function of time, and (ii) the mean displacement d of those fiber portions which have moved, also as a function of time, have…
By neutralizing sulphuric acid solutions of tetra(hydrogensulphato)boric acid with various metal hydrogensulphates, sodium, potassium, ammonium, and strontium salts have been prepared. From the compositions of these salts, and from the results of cryoscopic and conductimetric measurements on their solutions in sulphur…