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The general intensity equation for X-rays diffracted by a one-dimensionally disordered crystal with any value of the correlation range s i.e. \(I{=}N\text{Spur}\ \textbf{\itshape V}\textbf{\itshape F}+\sum\limits_{n{=}1}^{N-1}(N-n)\text{Spur}\ \textbf{\itshape V}\textbf{\itshape F}\textbf{\itshape Q}^{n}+\text{conj.}\…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Temperature Heat Contents of Calcium and Magnesium FerritesK. R. BonnicksonCite this: J. Am. Chem. Soc. 1954, 76, 6, 1480–1482Publication Date (Print):March 1, 1954Publication History Published online1 May 2002Published inissue 1 March 1954https://pubs.acs.org/doi/10.10…
Infrared absorption and photoconductivity in $p$-type germanium with gold and copper impurities have been investigated at different temperatures. Photoconductivity in gold-doped germanium at liquid nitrogen and liquid helium temperatures shows a long wavelength tail beyond the fundamental absorption edge, which falls…
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Summary Expressions are derived for the average elastic constants of a poly-crystalline bar, having circular symmetry about its principal axis, and composed of material with cubic crystal symmetry. It is shown that the differences between these and the corresponding constants obtained for a material with completely ra…
After giving a short review of Nagamiya-Yosida’s theory of antiferromagnetic resonance, it is shown that this theory is equivalent to Gorter-Ubbink’s at absolute zero, so far as the external field H employed in the former is replaced by H′ defined by 2Hx′=gaHx, etc. and the parallel and perpendicular susceptibilities…
Abstract Young's moduli are measured by a simple compression method on plasticized polyvinyl chloride (Vinylite VYNW) compounds containing from 5 to 100% polymer covering a range of approximately seven orders of magnitude in modulus. By comparing values obtained at different temperatures, it is shown that the 60‐secon…
It is shown that a simple theory based on the constant energy loss per unit path length of primary electrons accounts quantitatively for the variation of secondary electron emission yield below its maximum value. The theory can be extended formally to include a Bethe-type energy loss at high primary energies. An attem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heats of Hydration of Tricalcium Silicate and β-Dicalcium SilicateStephen Brunauer, J. O. Hayes, and W. E. HassCite this: J. Phys. Chem. 1954, 58, 3, 279–285Publication Date (Print):March 1, 1954Publication History Published online1 May 2002Published inissue 1 March 1954…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrolysis of Graphitic AcidEitaro MatuyamaCite this: J. Phys. Chem. 1954, 58, 3, 215–219Publication Date (Print):March 1, 1954Publication History Published online1 May 2002Published inissue 1 March 1954https://pubs.acs.org/doi/10.1021/j150513a006https://doi.org/10.1021/j1505…
Present technological developments are making more extensive use of liquid metals as heat‐transfer agents. Their stable and relatively noncorrosive character makes them especially adaptable for high‐temperature applications. The compatibility of various liquid metals with refractories has been investigated in the past…
Makinson's (1938) theory of the lattice component of the thermal conductivity of metals and alloys, when limited at low temperatures by interaction with the conduction electrons, is re-examined, and the magnitude of the lattice conductivity is related to the electronic thermal conductivity at low temperatures, thus av…
Abstract The present paper reports the results of a study of the decomposition product of the ethylamine‐cellulose complex obtained from cotton cellulose. It is shown that the cotton remaining after removal of ethylamine by distillation possesses a crystalline component identical with the ammonia‐cellulose decompositi…
A phase diagram for the zirconia‐titania system is proposed, based on the existence of a hitherto unreported compound, ZrTiOd. Thermal‐expansion and X‐ray diffraction experiments were performed on three series of specimens heated at 980°, 1370°, and 176O°C., respectively.
The lattice constants of sodium, potassium, rubidium, and cesium borohydrides have been measured at 25.0°C as 6.1635±0.0005, 6.7272±0.0005, 7.029±0.001, and 7.419±0.001A, respectively. All four crystals are face-centered cubic and have the sodium chloride structure. Below the transition point (—83°C) sodium borohydrid…
Abstract Es werden die Kraftkonstanten und Bindungsgrade einer Reihe von Sauerstoffsäuren bzw. ihrer Ionen berechnet. Aus den Bindungsgraden lassen sich Strukturformeln ableiten. Im Gegensatz zu den Ansichten der Oktett‐Theorie sind in den meisten Verbindungen Doppelbindungsstrukturen beteiligt. In den Ionen XO n sind…
(1954). Warp Knitting Technology. Journal of the Textile Institute Proceedings: Vol. 45, No. 3, pp. P108-P108.
Nuclear quadrupole resonance is a recently developed branch of radio-frequency spectroscopy which is concerned with magnetic resonance absorption in crystals. This absorption is due to reorientation of the nonspherical atomic nuclei against crystalline electric fields. Related phenomena in isolated molecules are brief…
Near 35°K the internal friction of vitreous silica reaches a peak value which increases with frequency. The temperature curves of the torsion and Young's moduli are concave upward with minima near 65°K and are independent of frequency. These effects are reversible with temperature. Their cause cannot be the usual type…
In a recent paper Taylor has shown that three distinct hydration levels exist within the ‘calcium silicate hydrate (l)’ group of artificial preparations (Taylor, 1953 a , p. 168). The individual hydrates may be distinguished from the position of the 002 reflection in X-ray powder photographs. The d spacings correspond…