Bound Exciton Complexes
Received 11 September 1961DOI:https://doi.org/10.1103/PhysRevLett.7.316©1961 American Physical Society
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Phenomenological Discussion of Magnetic Ordering in the Heavy Rare-Earth Metals
The rare-earth metals Gd-Tm have similar crystal structures and their magnetic properties have been partially evaluated by a number of techniques. The magnetic order is complicated, showing several phases in some cases and differing considerably in the various elements. These various orderings can be explained on a mo…
Relationship Between Crystal Symmetry and Magnetic Properties of Ionic Compounds ContainingMn3+
An investigation has been made of the relationship between crystallographic symmetry and ${\mathrm{Mn}}^{3+}$ - ${\mathrm{O}}^{2\ensuremath{-}}$ - ${\mathrm{Mn}}^{3+}$ 180\ifmmode^\circ\else\textdegree\fi{} superexchange interactions in several perovskite systems. In particular, crystallographic and magnetic measureme…
THE ELECTRICAL RESISTIVITY OF Mn3ZnC BETWEEN 4.2° AND 630° K
The electrical resistivity of an alloy having approximately the composition Mn 3 ZnC has been measured between 4.2° and 630° K. From a high residual value the resistivity increases with temperature in a complicated way up to 550° K, becoming temperature independent above that point. Two anomalous regions are evident c…
A note on the structure of Zr2Co
Ttne t~pe-raruredmm.p~sit:~on$gagram a£ the ehconEullrcobalt s g s f ~m is curtent.lybeing investtgated by Pechin (1961) .Three intsrme?diata phases have brew bdentified as ZrCoz, Z r C o , and Zr2Co; at least two additional phases with as yet undefined stoichfametry e x i s t i a the cobalt-rich partion a£ the system…
Interdiffusion of Helium and Argon in a Large-Pore Graphite.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterdiffusion of Helium and Argon in a Large-Pore Graphite.R. B. Evans, Jack Truitt, and G. M. WatsonCite this: J. Chem. Eng. Data 1961, 6, 4, 522–525Publication Date (Print):October 1, 1961Publication History Published online1 May 2002Published inissue 1 October 1961https:…
The Gaseous Oxides of the Platinum Metals
This paper reviews the experimental techniques used in the elucidation of the thermodynamics of the volatile oxides of the platinum metals in the temperature range 1200 to 1800°C. It is shown how the molecular formulae of the gases were obtained, and free energy equations of the two- term type are given for PtO 2 , Rh…
Ferromagnetic Resonance in Thin Magnetic Films at Radio Frequencies
Ferromagnetic resonance in thin films has been extended to the radio-frequency region of from 1–20 Mc. Theoretical expressions governing this resonance condition are given along with experimental results. It is found that resonance in this region affords an excellent means of measuring the anisotropy field Hk. Films w…
Indirect evaluation of orientation in polycrystalline materials
Abstract For a polycrystalline material with partial orientation, relations are established between the mean square cosines of the angles ρ between the axis of orientation and lines fixed with the lattice. Experimentally, the mean orientation f = <3/2 cos 2 ρ −1/2 > for the normal to a lattice plane can be deter…
Thermal stability of polydimethylsiloxane. I. Deactivation of basic active centers
Abstract The thermal stability of polydimethylsiloxane is determined by both the resistance of the siloxane chain to depolymerization and the resistance of the hydrocarbon side groups to various forms of degradation. Basic and acidic impurities present in the polymer promote depolymerization as well as degradation. Es…
Preparation and Characterization of Dodecaphenylcyclohexasilane
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of DodecaphenylcyclohexasilaneH. J. S. Winkler, A. W. P. Jarvie, D. J. Peterson, and H. GilmanCite this: J. Am. Chem. Soc. 1961, 83, 19, 4089–4093Publication Date (Print):October 1, 1961Publication History Published online1 May 2002Published…
Infrared Transmittance of Crystalline Yttrium Oxide and Related Compounds
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text K. A. Wickersheim and R. A. Lefever, "Infrared Transmittance of Crystalline Yttrium Oxide and Related Compounds," J. Opt. Soc. Am. 51, 1147-1148 (1961)…
The crystal structure of xanthates II. Antimonious xanthate
This paper presents the crystal structure of antimonious xanthate, Sb (S–CS–O–C 2 H 5 ) 3 , which has been solved with two Buerger equator photographs. Space group: R [unk], a = 10.13 Å, α = 103° 30′. The structure has been refined more than the arsenious xanthate structure, already published as the first contribution…
Partial Rotation in Permalloy Films
Magnetization reversal at an angle to the easy direction has been studied on Permalloy films with different values of coercive force Hc and anisotropy field HK. The hysteresis properties show that ``inverted'' films (Hc&gt;HK) do not represent a special case, but that every film exhibits inversion in a certain sec…
Die Kristallstruktur des SrZnO2
Abstract Die Kristallstruktur des SrZnO 2 wurde mit Hilfe 3‐dimensionaler P ATTERSON ‐ und F OURIER ‐Synthesen aufgeklärt. SrZnO 2 kristallisiert orthorhombisch in der Raumgruppe D 16 2h ‐Pmnb. Die Elementarzelle mit a = 3,35, b = 5,84, c = 11,37 Å enthält 4 Formeleinheiten (d Rö = 5,52; d pyk = 5,49 g · cm −3 ). Im B…
Elastic-Plastic Transition in Copper Crystals as Determined by an Etch-Pit Technique
Copper (99.999%) crystals with a dislocation density of 50/mm2 have been prepared. These crystals were stressed by applying a pure bending moment, and they were etched with a dislocation etch either before and after or while the stress was applied. The motion of dislocations was determined by observing the size and na…
Zeeman Effect of the Nuclear Quadrupole Resonance Spectrum in Crystalline Powder
The Zeeman effect of the nuclear quadrupole resonance spectrum for spin I=32 in crystalline powder has been studied. Theoretical considerations have predicted that, in a nonaxial electric field gradient, the absorption line should be broadened with a characteristic envelope by a weak static magnetic field. When a radi…
Internal friction in polyoxymethylene
Abstract Mechanical relaxation was studied in bulk polyoxymethylene by means of a torsion pendulum. The magnitude of the large γ peak at 203°K. (for f = 1.1 cycles/sec.) decreases with increasing density. The magnitudes of the β peak at 260°K, and the α peak at 400°K. do not depend on density. The β peak is small unle…
Electrical Properties of Nonstoichiometric Uranium Dioxide
Electrical conductivity and thermoelectric power measurements have been made on nonstoichiometric UO2 at temperatures of 500–1150°C. The conductivity data in the single phase UO2+x region can be represented by the equation σ(ohm cm)−1=(3.8×106)/T(2x)(1−2x) exp[(−0.30±0.03 ev)/kT].An approximate equation for the thermo…
On the Wear of Sapphire
The wear resistance of single crystals of sapphire was determined as a function of crystallographic orientation with respect to plane of wear and rubbing direction. Distinct anisotropy was found. Evidence of plastic flow at the wear surface on both basal and prismatic slip systems was obtained. In bulk deformation tes…