Symmetry Considerations on Martensitic Transformations: "Ferroelectric" Metals?
Received 22 December 1964DOI:https://doi.org/10.1103/PhysRevLett.14.217©1965 American Physical Society
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Pressure Dependence of the Alpha-Beta Transition Temperature in Silver Selenide
The pressure dependence of the alpha-beta transition temperature in Ag(2)Se was determined by observing the temperature at which the sharp change in resistivity occurs when Ag(2)Se is transformed from the low-temperature orthorhombic to the high temperature body-centered-cubic form. The transition temperature increase…
Screw Dislocations in Graphite
Graphite contains varying concentrations of screw dislocations whose Burgers vector parallels the c axis. Single crystals of natural graphite contain very few such dislocations; furthermore, their Burgers vector always exceeds 450 angstroms. Pyrolytic graphites annealed above 3000 degrees C contain abundant screw disl…
Anisotropy of thermal conductance in near-ideal graphite
Abstract Measurements of thermal conductivities of a number of pyrolytic graphites are reported including values for annealed, hot pressed graphite (IFPA 57). Thermal conductivities of IFPA 57 in both basal plane and c-axis directions approach the values for ideal graphite at higher temperatures. A theoretical estim…
Gespannte polycyclische Systeme aus Drei‐ und Vierring‐Bausteinen
Abstract Aus kleinen Ringen aufgebaute Polycyclen sind seit einigen Jahren bekannt. Ihre auch theoretisch interessanten chemischen und physikalischen Eigenschaften werden erläutert und Darstellungsmethoden an einigen Beispielen gezeigt. Besonders besprochen werden die Kohlenstoff‐Gerüste wie sie das Tetraeder, das Dew…
Potassium Content of Illite
The average potassium oxide content of 18 Paleozoic two-layer monoclinic illites is 8.75 percent. There is an excellent linear relation between the ratio of the intensities of the reflections at 10 angstroms and 5 angstroms (10 A/5 A) and the potassium oxide content. The frequency distribution curve of the 10 A/5 A in…
Optical Second-Harmonic Generation in Crystalline Amino Acids
Optically active amino acids contain many highly efficient optical second-harmonic generators. When light from a ruby laser at 6943 A falls on the crystalline amino acids with sufficient intensity, the second harmonic of the light at 3471 A can be observed. Although the symmetry requirements for optical second-harmoni…
Oxidative degradation of poly(ethyl acrylate)
Abstract The oxidative degradation of poly(ethyl acrylate) was investigated by infrared spectrophotometric techniques, and the volatile degradation products were determined by vapor‐phase chromatographic analysis. During the course of degradation, no change in the spectrum of the polymer, indicating the formation of o…
Some Thermal Properties of Fabrics
It is well known that the insulating ability of fabrics, singly, or in layers of clothing, may be towered sub- stantially if the clothing becomes wet, for example, from rain penetration.According-Iy.all-weather garments
Dynamic mechanical studies of irradiation effects in polytetrafluoroethylene
Dynamic mechanical measurements were made with a low frequency (similar 1 c/s) torsion pendulum at temperatures from -170 to 150°C, on thin polytetrafluoroethylene (PTFE) sheet irradiated in vacuum at 23°C with doses up to 5 megarads of gamma radiation. Marked radiation-induced increases in shear modulus and decreases…
OROTIDINE-5′-PHOSPHATE PYROPHOSPHORYLASE OF WHEAT EMBRYOS
Orotidine-5′-phosphate pyrophosphorylase was isolated from wheat embryos and purified 35-fold. The enzyme is inhibited by high concentrations of orotate. Cu ++ and Mn ++ ions can replace the Mg ++ ion requirement. The enzyme shows a primary and secondary optimum at pH 8.5 and 9.8. Dihydro-orotate:NAD dehydrogenase als…
Cyclic Compounds as Configurational Models for Stereoregular Polymers
Abstract It is possible to draw analogies between linear polymers and cyclic compounds. Stereochemical considerations developed in this connection led to the recognition of new aspects of importance for the systematic classification of both classes of compounds; for example, asymmetric structures can be predicted whic…
Effect of the Catalyst Upon the Physical and Chemical Properties of Cotton Cellulose Finished with Derivatives of Ethyleneurea
Cotton print cloth (68 X 72) has been treated with aqueous solutions of dihydroxy ethyleneurea (DHEU) and several of its derivatives in the presence of inorganic catalysts at constant molar concentration of the metallic ion. The derivatives were N,N'-dimeth yloldihydroxyethyleneurea (DMDHEU), a dioxane complex of DMDH…
Strained Polycyclic Systems Consisting of Three‐ and Four‐Membered Rings
Abstract Polyclic compounds consisting of small rings have been known for several years. Their chemical and physical properties, which are of both theortical and practical interest, are discussed, and methods of preparation of a few examples are illustrated. The carbon skeletons of tetrahedrane, Dewar benzene, prisman…
The mechanical properties of reactor graphite
It is shown that after brief neutron irradiation the elastic constants of polycrystalline reactor graphite are reasonably consistent with the single crystal values in a uniform stress (Reuss) approximation. A method is proposed for dealing with the anisotropy of the polycrystalline aggregate by reference to the coeffi…
Complexes of the Lanthanide Elements with α-Picolinate and α-Picolinate N-Oxide Ions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexes of the Lanthanide Elements with α-Picolinate and α-Picolinate N-Oxide IonsH. Yoneda, G. R. Choppin, J. L. Bear, and A. J. GraffeoCite this: Inorg. Chem. 1965, 4, 2, 244–246Publication Date (Print):February 1, 1965Publication History Published online1 May 2002Publis…
PROPERTIES AND GENESIS OF THREE MEMBERS OF THE UPLANDS CATENA
Field measurements were recorded of water table, Eh, moisture, and temperature for three members of the Uplands catena throughout 2 years. Samples of the Orthic Podzol (Uplands), Gleyed Orthic Podzol (Rubicon), and Orthic Gleysol (St. Samuel) were analyzed.High Eh values (above 600 mv) and a water table below 4 ft pre…
Contributions to theV51Nuclear Magnetic Resonance Frequency Shift and Susceptibility in Vanadium Sesquioxide
The ${\mathrm{V}}^{51}$ NMR frequency shift ($\frac{\ensuremath{\Delta}\ensuremath{\nu}}{\ensuremath{\nu}}$) in metallic ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ has been measured in the temperature range of 175 to 575\ifmmode^\circ\else\textdegree\fi{}K the frequency shift at these two temperatures being -0.61% and +0.1%…
IMMERSIONAL WETTING OF SOLID SURFACES
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIMMERSIONAL WETTING OF SOLID SURFACESA. C. ZettlemoyerCite this: Ind. Eng. Chem. 1965, 57, 2, 26–36Publication Date (Print):February 1, 1965Publication History Published online1 May 2002Published inissue 1 February 1965https://pubs.acs.org/doi/10.1021/ie50662a005https://doi.…
Effects of Dynamic Lattice Distortions on the Structure of theFBand in the Cesium Halides
The smooth, nearly Gaussian, optical absorption band of $F$ centers in most alkali halides contrasts with that observed at low temperatures in the cesium halides, where two or sometimes three components are partially resolved. A strong spin-orbit coupling could account for two components, but the third has remained a…