Materials Literature
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Abstract Solubilities and diffusivities of N 2 , O 2 , CO 2 , and He in a variety of polyethylenes were measured in the temperature range 0–50°C. Polyethylene films studied covered a range of crystallinities (43–82%) and branching indices, and were prepared under a variety of known thermal histories. Diffusivities wer…
The absorption spectra of evaporated films of the alkali halides, with the exception of LiF, have been measured at room temperature and 80\ifmmode^\circ\else\textdegree\fi{}K in the region from 1100 A to 2500 A. The spectra are rather complex at low temperature, but agree fairly well with current theory concerning the…
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A theoretical discussion is presented on the fundamental processes by which pulsating gas bubbles in liquids dissipate their energy. The survey is limited to the case where the amplitude of the volume pulsations are assumed to be sufficiently small that the pulsations may be described by linear equations. A portion of…
Abstract Many-electron wave functions are usually constructed from antisymmetrized products of one-electron orbitals (determinants) and energy calculations are based on the matrix element expressions due to Slater (1931). In this paper, the orbitals in such a product are replaced by ‘group functions’, each describing…
Electroluminescence occurs in activated ZnS thin films at 1.5 volts rms (peak voltage 2.2 volts) corresponding to electron energies less than the band gap (3.8 electron volts) and less than the mean energy (2.6 electron volts) of the photons emitted. The light emission decreases by ${10}^{4}$ between 2.0 and 1.5 volts…
A small angle intensity is to be expected from double reflections in any powder sample comprising small grains with random orientation. The inter-grain contribution is due to an hlcl reflection in one grain, followed by the same hkl reflection in another grain. The intra-grain contribution arises from a hlcl reflectio…
The crystal structure of Ti2Ni has been determined from powder specimens. The unit cell is facecentered cubic with 96 atoms and dimension a=11.278+_0.001 /I at 21 C. The space group is O~z-Fd3m. 64 titanium atoms are in positions 48f and 16c, and 32 nickel atoms are in positions 32e. The atomic parameters, X_~i =0.215…
Ammonia and deutero-ammonia have been studied by single-crystal and powder X-ray methods.There are four molecules in the cubic unit cell, and the space group is confirmed to be P2 1 3.The nitrogen parameter obtained by 0 least squares refinement is equal to 0.0401 for NH 3 at -102 C and the same for ND 3 at -l60°C.Cel…
Article Zur Systematik und gruppentheoretischen Ableitung der Symmetrie-, Antisymmetrie-und Entartungssymmetriegruppen was published on November 1, 1959 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 111, issue 1-6).
Abstract Der Auflösungsvorgang des Elektrolytkupfers in Elektrolyten wurde anhand des Korrosionsstroms i 0 verfolgt. Für die Auflösungsgeschwindigkeit in 0,25 n‐NaCl und 0,25 n‐KH 2 PO 4 gelten die exponentiellen Beziehungen: i 0 = 0.20 . t 1.67 , bzw. i 0 = 0.08 . t 0.695 , und in 0.5 n‐KNO 3 gilt die lineare Beziehu…
Article Structural polytypism of lead iodide and its relationship to screw dislocations was published on November 1, 1959 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 111, issue 1-6).