665. Ultraviolet and infrared spectra of some aromatic nitro-compounds
C. P. Conduit, J. Chem. Soc., 1959, 3273 DOI: 10.1039/JR9590003273
Materials Literature
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Effects of Distribution of Correlation Times uponT1andT2in Nuclear Magnetic Resonance
The relaxation times T1 and T2 and the activation energy of segment motion in the nuclear magnetic resonance (NMR) for polymer systems are explained in the consideration of distribution of correlation times. The experimental relations between T1 and T2 in many kinds of compounds show that BPP's and Kubo-Tomita's theor…
Determination of equilibrium constants for a number of metal‐phosphate complexes
Abstract Many metal ions form soluble complexes with pyro‐ and tripolyphosphate. Complex formation entails a decrease in pH. By measuring the pH and in some cases the concentration of free metal ions, equilibrium constants for a number of metal‐phosphate complexes were determined at 25° and at 40°. Activity correction…
THE GROUPS πr(Vn,m) (IV)
THE GROUPS π r ( V n,m ) (IV) Get access G. F. PAECHTER G. F. PAECHTER Oxford Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Mathematics, Volume 10, Issue 1, 1959, Pages 241–260, https://doi.org/10.1093/qmath/10.1.241 Published: 01 January 1959 Article history Receive…
Ferromagnetic resonance in polycrystals
The theory of ferromagnetic resonance in polycrystalline material is developed for the two cases in which the anisotropy field is either very large or very small compared with the saturation magnetization. Experimental results obtained with cubic and hexagonal ferrites of large anisotrapy agree reasonably well with th…
The relation between birefringence and draw ratio of man‐made fibers
Abstract In the course of our investigations into the relation between draw ratio ( i.e. , the permanent extension ratio imparted during manufacture) and birefringence of man‐made fibers, we found that the relation published by Kordes et al. for Perlon (nylon 6) has equivalents for several different fibers that may be…
The dielectric behaviour of vapours adsorbed on porous solids
J. M. Thorp, Trans. Faraday Soc., 1959, 55, 442 DOI: 10.1039/TF9595500442
The system magnesium oxide-germanium dioxide
The phase equilibrium diagram for the system MgO-GeO <sub>2</sub> has been determined by the quenching method. Three compounds are found in the system: MgO.GeO <sub>2</sub> , melting congruently at 1700+ or -20 degrees C; 2MgO.GeO <sub>2</sub> ; and 4MgO.GeO <sub>2</sub> , which dissociates at 1495+ or -1O degrees C,…
Über den Thermischen Abbau von Siliciumdiimid Si(NH)2
Abstract Aus SiCl 4 und flüssigem NH 3 dargestelltes Si(NH) 2 wird bei p NH3 = 50 Torr abgebaut. Folgende Abbaureihe wurde sichergestellt: magnified image Außer dem hexagonal kristallisierenden α‐Si 3 N 4 2 sind alle Verbindungen röntgenamorph und sehr feuchtigkeitsempfindlich. Wahrscheinlich liegen Hochpolymere vor,…
Some ferrimagnetic and antiferromagnetic materials at low temperatures
The magnetization of single crystals and of polycrystals of a number of materials has been investigated at temperatures from 1. 3 to 300 °K, in fields up to 12,500 oersteds. Measurements were made on single crystals of LiMnPO4 (orthorhombic), Fe 3(PO4)2.4H2O (monoclinic), and HoFeO 3 (orthorhombic) ; polycrystalline m…
40. Aspects of stereochemistry. Part XI. Epoxide formation in the cyclohexene and bicycloheptene series
H. B. Henbest and B. Nicholls, J. Chem. Soc., 1959, 221 DOI: 10.1039/JR9590000221
On the influence of 3d4 ions on the magnetic and crystallographic properties of magnetic oxides
After a brief reference to the physical basis for a tetragonal distortion (c/a > 1) of an octahedral anion interstice which is occupied by a cation with outer-electron configuration 3d4, the crystallographic properties of several Mn3+-containing oxides are given to illustrate the significance of this effect for determ…
Über bi‐ und polycyclische Azulene, XXXVII. Synthesen und Eigenschaften von Azulen‐aldehyden
Abstract Azulen‐aldehyde‐(1) bzw. ‐(3) lassen sich nach dem Verfahren von V ILSMEIER darstellen. Sie sind reaktionsträger als aromatische Aldehyde. Die Aldehydgruppe läßt sich durch Reduktion nach H UANG ‐M INLON in die Methylgruppe überführen. Die dabei eintretenden spektralen Verschiebungen werden diskutiert. An ein…
An Investigation of the Compound Silicon Boride (SiB[sub 6])
Single crystals of the compound silicon hexaboride have been prepared. Laue, rotation, and Weissenberg photographs indicate an orthorhombic cell with lattice parameters a = 14.39 ± 0.01 , b = 18.27 ± 0.01 , and c = 9.88 ± 0.01 A å . The pycnometer density is 2.43 g/cm 3 . The average electrical resistivity of single c…
422. Experiments towards the synthesis of corrins. Part I. The preparation and reactions of some Δ 1 -pyrrolines. A novel proline synthesis
R. Bonnett, V. M. Clark, A. Giddey and A. Todd, J. Chem. Soc., 1959, 2087 DOI: 10.1039/JR9590002087
Mass Spectrometric Study of Inter-Group IVB Molecules
The systems germanium-graphite and germanium-silicon-carbon have been studied. Several gaseous molecules containing Ge, Si, and/or C were observed and their dissociation energies determined from measured partial pressures. A general picture of the dissociation energies of di-, tri-, and tetraatomic intergroup IVB mole…
The relationship between structure and properties of crystalline, high‐melting polyhydrocarbons
Abstract Twenty‐two α‐olefin monomers with varying degrees and types of branching in the lateral group have been polymerized and the polymers characterized. In general, the closer the branching in the side chain is to the polyethylene trunk, the higher the degree of crystallinity and the crystalline melting point. The…
Sur les effets des interactions entre les domaines élémentaires ferromagnétiques : Bascule et reptation
L'auteur développe une théorie élémentaire des couplages entre domaines ferromagnétiques à cycles rectangulaires, basée sur l'étude détaillée des propriétés de couples de deux domaines : il prévoit ainsi des effets théoriques nouveaux et notamment celui de bascule. Il s'agit d'une variation positive ou négative de l'a…
The Growth of Barrier Oxide Films on Aluminum
The growth of anodically formed barrier oxide films on aluminum has been followed by weight, capacitance, and rate measurements. The increase of film thickness at constant voltage has been calculated and compared to the values obtained by optical measurements. The results have been shown to obey the law .
Substitution dans les hexaferrites de l'ion Fe3+ par Al3+ , Ga3+, Cr3+
L'aimantation à saturation absolue, les paramètres de la maille et les intensités des raies Debye-Scherrer ont été étudiés dans les composés BaO, (6-x) Fe2O3, xM2O3 où M = Al, Ga, Cr. On en déduit la répartition préférentielle des atomes M sur les sites cristallographiques 2a, 2b, 4f1, 4f2 et 12k du groupe P6/mmc. La…