Materials Literature
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Absolute infrared intensities have been measured for ν2 and ν3 of CS2 in the solid phase. Path lengths were measured by counting interference fringes as the solid is condensed onto a cold window. The index of refraction of the solid film is estimated from the intensity of the fringe pattern on different windows of kno…
The (triplet-state) TCNQ ion radical salts and also Würster's blue perchlorate exhibit deviations from the normal behavior of typical molecular solids. These systems are believed to contain triplet excitons which are restricted to essentially a unidirectional propagation. A simple phenomenological model is presented w…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation C. G. B. Garrett, F. R. Merritt; PMR SPECTRA OF Nd3+ IN COMPENSATED AND UNCOMPENSATED CaWO4. Appl…
The quantum yield of the potassium ferrioxalate actinometer at 365/6 mμ has been measured to be 1.26±0.03 relative to a calibrated thermopile. Comparisons of thermopiles were carried out at the Eppley Laboratory and at the National Bureau of Standards to ensure the flatness of thermopile response. Irradiations were ma…
The crystal structure of CaWO4 (scheelite) has been refined with single-crystal x-ray diffraction data. For the tetragonal cell a=5.243±0.002, c=11.376±0.003 Å. Oxygen coordinates 0.1504, 0.0085, and 0.2111 correspond to Ca–O distances 2.44 and 2.48 Å and W–O distances 1.78 Å.
The CaWO4 structure has been refined, starting with the parameters of Sillén and Nylander, using two zones of neutron diffraction data. The oxygen coordinates with the origin of the cell at the W atom (4̄) are x=0.2413 (σ=0.0005), y=0.1511 (σ=0.0006), z=0.0861 (σ=0.0001). The slightly distorted WO4 tetrahedron contain…
The Slater theory of the ferroelectric phase transition in K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ type crystals as modified by Takagi and extended by Senko is examined again in the light of recent measurements of parameters made on K${\mathrm{D}}_{2}$P${\mathrm{O}}_{4}$. Making full use of the measurements, and assign…
Previously available data on nonlinear optical phenomena in potassium dihydrogen phosphate (KDP) are interpreted together with new data on the linear electrooptic effect. It is shown that second harmonic generation is dominated by energy levels in the ultraviolet ("electronic" levels) whereas the dc and linear electro…
The conventional spherical harmonics expansion of the electron distribution function has been useful in obtaining solutions of the Boltzmann equation under circumstances in which the distribution function is fairly isotropic. This same expansion is here used under conditions in which the distribution is distorted by t…
Crystals of CdTe containing 1 mole% of Mn, Fe, or ZnTe have been grown from the melt. The segregation coefficients of these impurities and of Co can be understood in terms of differences in the covalent, tetrahedral radii of the various metal atoms. The thermal conductivity, $K$, of these crystals and of pure CdTe has…
Brief Particulars of Recently Introduced Materials likely to have Aircraft, Missile or Space Vehicle Applications. Imperial Aluminium Co. Ltd. , Birmingham, is now operating a sales agency in Great Britain for all the aluminium chemical and paste/powder products of ALCOA { Aluminum Company of America ).
As an attempt to improve the stability problem of U-carbide fuel, the solid solutions of UC-ZrC and UC-NbC were prepared. Their stabilities against water corrosion and atmospheric oxidation and their compatibility with graphite were compared with those of UC and UC2.UO2+C+ZrC (NbC) mixture was heated in vacuum at arou…
The authors found that α-alumina film is produced on aluminium by anodic oxidation in the low temperature melts of bisulphates.1, 2, 3) In this paper, in order to clarify the mechanism of formation, optical studies were made for such films as well as the films formed under certain other conditions which are likely to…
Optical observations facilitate the elucidation of the structure of anodic oxide films on aluminium which are mostly of amorphous nature and thus are difficult to be analyzed by X-ray diffraction.In the previous paper, the authors clarified the process of formation and the crystal structure of α-alumina films anodical…
This paper reports the results of efforts to fabricate PbTe thermoelectric elements with a combination of high figure of merit and good shock resistance. Two partially successful approaches to this problem were the addition of tin to PbTe and the application of hot powder pressing. Experimental evidence is presented t…
When high-carbon steel ingots of collt/Jarative/y large size are heated m a heating furnace, crach are often ob,erved in their interior. The author has studied eX/Jerilllentally and theoretically the con.ditions under wh.ich these ingots develop cracks lInder thermal stress during the heating /Hocess.
Differential thermal analysis has been utilised for determination of surface area of china clay and bentonite samples. It, has been observed that the amount of mechanically adsorbed H2O in kaolinite and bentonite samples varies linearly with the surface area of the samples. The amount of this adsorbed H2O has been det…
The influence of the flow resistance of fabrics on their absorption characteristics has been investigated by measuring the flow resistance and the absorption characteristics. To deal with this subject from the point of view of the design and density of fabrics, we wove 13 different kinds of cotton fabrics as samples.…
Abstract A review of the various theories of potential formation on the glass‐electrode is followed by a discussion of the deviations from the ideal hydrogen (H) electrode function in the acidic and alkaline ranges from the viewpoint of the phase‐boundary‐potential theory. The effect of the composition and solubility…
The design of back-up roll bearings in cluster-type rolling mills has, historically, been dictated by past engineering trial and error experience. Thus, to cause the bearings to act, as nearly as practicable, similarly to conventionally supported bearings, the outer ring section is usually made very heavy precluding l…