Materials Literature
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The luminescence of pure alkali halide crystals induced by the excitation with UV-light in the fundamental absorption region at low temperature is observed in NaCl, KCl, RbCl, NaBr, KBr, RbBr and KI. In KCl, RbCl and NaBr one emission band, in NaCl, KBr and RbBr two emission bands and in KI three emission bands are in…
Ferromagnetic resonance has been observed in single crystals of the family La 1−x Pb x MnO 3 with 0.25 < x < 0.45 from 13 to 25 GHz and in the temperature range from 77 to 430 °K. The line width, ΔH, exhibits a sharp minimum accompanied by an isotropic shift in the resonance line at a critical temperature, T c .…
The paramagnetic resonance spectrum of Tb 4+ in zircon shows that Tb 4+ ions enter the tetragonal lattice substitutionally for zirconium. The 8 S 7/2 ground-state splittings are 23 times as large as those for Gd 3+ in this mineral, totalling nearly 10 cm −1 .
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical properties and crystal structure of barium tantalum sulfide, BaTaS3Richard A. Gardner, Marcus Vlasse, and Aaron WoldCite this: Inorg. Chem. 1969, 8, 12, 2784–2787Publication Date (Print):December 1, 1969Publication History Published online1 May 2002Published iniss…
Abstract Sediment samples from cores taken in the Gulf of Mexico were subjected to normal laterally confined loads of 0.5, 4.0, 32.0, and 64.0 kg per cm 2 . Electron micrographs of their microstructure show the progressive change in particle orientation during the laboratory consolidation of a sediment sample. A predo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of asymmetric silicon. XVII. Synthesis, resolution, and stereochemistry of the 1,2,2,2-tetraphenyl-1-methyldisilane systemLeo H. Sommer and K. T. RosboroughCite this: J. Am. Chem. Soc. 1969, 91, 25, 7067–7076Publication Date (Print):December 1, 1969Publicatio…
Abstract Infrared spectroscopy studies were undertaken to determine the effects of ultraviolet light radiation on a methylsiloxane resin. The results indicate that SiCH 2 Si linkages were formed as a result of irradiation at wavelengths above 281 mμ from a xenon are lamp; on the other hand, SiOH and SiCH 2 CH 2 Si li…
Studies of the EPR of dilute Mn2+ in CsPbCl3 have been carried out over the temperature range 77°–340°K. Crystalline phase changes as indicated by changes in the Pb site symmetry were evident at 320°K (46.5°C) and 185°K. The first of these has been reported previously while the latter is apparently a new observation.…
Abstract The kinetics of the reaction between water and MgO powders has been investigated at 9°, 18°, 28° and 38°C in a stirred batch reactor. Six commercial samples of MgO prepared from Mg(OH) 2 plus two of unknown origin, with specific surface areas of 12 to 80 m g /g, were studied. After correcting for particle siz…
A time-dependent relaxation model for the heat flux in metals is derived from the quantum mechanical form of the Boltzmann transport equation. In the derivation, the manipulation of the nonlinear integral term of the Boltzmann equation is simplified by assuming that the phonons are in thermal equilibrium at all times…
High‐temperature deformation in ZrC single crystals was studied. Seeded crystals were grown by a direct rf‐coupling floating‐zone process. Yield stresses were measured from 1080° to 2000°C as a function of stress axis orientation. The Burgers vector was shown to be parallel to the 〈110〉 axes by transmission electron m…
There is some ambiguity in the interpretation of internal photoemission experiments because of the possible contribution of hole emission from the anode in addition to the cathode electron emission. Furthermore, correction of the photocurrent spectra for optical intensity variations is essential to determination of ph…
The internal stress distribution theory of magnetomechanical damping is modified and extended to include effects of applied magnetic fields and applied static stresses. The present internal stress distribution function yields Rayleigh behavior at low vibration stress and has a more realistic shape than that of the pre…
By measuring internal crystallization in vitreous silica, the kinetics of crystallization and melting of cristobalite were determined near the melting point. Both processes followed linear growth kinetics and could be completely represented by the equation μ=AΔT/η. Analyses of the crystallization data and observations…
Abstract Polytypism in trioctahedral 1 : 1 phyllosilicates results from two variable features in the structure. (1) The octabedral cations may occupy the same set of three positions throughout or may alternate regularly between two different sets of positions in successive layers. (2) Hydrogen bonding between adjacent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption on hydroxylated silica surfacesMichael L. Hair and William HertlCite this: J. Phys. Chem. 1969, 73, 12, 4269–4276Publication Date (Print):December 1, 1969Publication History Published online1 May 2002Published inissue 1 December 1969https://pubs.acs.org/doi/10.102…
M. W. Thompson London: Cambridge University Press. 1969 Pp. viii + 384. Price £6 Prof. Thompson has written a book in which the ideas and material are presented at two quite distinct levels of scientific sophistication. In the first quarter of the book he discusses the nature of point and extended defects in crystals…
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