Materials Literature
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The possibility of performing magnetic resonance experiments in substances with spiral spin structures is studied. Particular attention is paid to the variation of spin arrangement and spin-wave spectrum with an applied magnetic field in the plane of the spiral. Perturbation techniques give resonance frequencies for s…
The magnetocrystalline anisotropy of magnetite has been measured by the torque method between 4.2 and 110\ifmmode^\circ\else\textdegree\fi{}K. The anisotropy energy of the orthorhombic phase which exists below 114.5\ifmmode^\circ\else\textdegree\fi{}K is represented by the formula ${E}_{a}={K}_{a}{{\ensuremath{\alpha}…
Synthetic single crystals were grown by the flux method. It was confirmed that the weak ferromagnetic moment appears only when the spins lie in the (111) plane. Contrary to the case of polycrystallines specimens, recovery of the residual magnetization or the memory phenomenon is not observed. It was found, below the t…
Abstract The phase transition of potassium thiocyanate has been investigated by the X-ray diffraction. It was confirmed that it is an order-disorder type transition with regard to the orientation of the thiocyanate ions. The temperature dependence of the ordering and the anomalous volume expansion near the transition…
LiAl 5 O 8 exists in many forms. The equilibrium high‐temperature form (I) has a spinel structure. It undergoes a first‐order reconstructive transformation at 1295°× 5°C to an equilibrium low‐temperature form (II) with primitive cubic symmetry, the unit edge changing from a 0 = 7.921 A (I) to a 0 = 7.907 A (II). In ad…
The melting and crystallization of tetragonal phosphorus pentoxide has been investigated by the use of a microscopic technique. Superheating of about 50° above the melting temperature was possible. Melting was heterogeneous and began only at free surfaces or grain boundaries but never within a crystal. At a supercool…
An accurate electrochemical technique for the removal of extremely thin (10–1000 Å) uniform layers of metal from a tungsten target has been developed analogous to that used previously for range studies in aluminum. This technique has been used to obtain the range distributions of Xe 133 and Ar 41 ions in rolled tungst…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Study of the Thermal Decomposition of Calcium Dihydrogen PhosphideLouis L. Pytlewski and Eugene R. NixonCite this: Inorg. Chem. 1963, 2, 4, 763–764Publication Date (Print):August 1, 1963Publication History Published online1 May 2002Published inissue 1 August 1963https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkoxychlorosilanes and Alkoxysilanes Containing Silane HydrogenOlgierd J. KlejnotCite this: Inorg. Chem. 1963, 2, 4, 825–828Publication Date (Print):August 1, 1963Publication History Published online1 May 2002Published inissue 1 August 1963https://pubs.acs.org/doi/10.1021/i…
Thermal‐expansion measurements were made in an air atmosphere to 2200°C on polycrystalline single‐phase ceramic oxides. Specimens were fabricated by hot‐pressing, slip casting, and isostatic pressing. Magnesium oxide was tested in both air and argon; calcium oxide as well as magnesium aluminate and aluminum oxide spec…
Crystallographic analyses of dislocation networks in annealed b.c.c. iron observed in the electron microscope have been carried out by applying the kinematical theory of electron diffraction contrast at dislocations and Frank's formula for determining the dislocation content of a grain boundary from a crystallographic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen-Halogen Exchange between Silanes and Triphenylmethyl HalidesJoyce Y. Corey and Robert. WestCite this: J. Am. Chem. Soc. 1963, 85, 16, 2430–2433Publication Date (Print):August 1, 1963Publication History Published online1 May 2002Published inissue 1 August 1963https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyexomethylene Small-Ring Hydrocarbons: Tetramethylenecyclobutane and DihydrotetramethylenecyclobutaneG. W. Griffin and L. I. PetersonCite this: J. Am. Chem. Soc. 1963, 85, 15, 2268–2273Publication Date (Print):August 1, 1963Publication History Published online1 May 2002Pu…
The Jander, Dünwald‐Wagner, and Ginstling‐Brounshteǐn equations for isothermal reaction kinetics are discussed and compared directly. A table of α (fraction of total material reacted) versus Kt (product of isothermal reaction constant and time) is given for each of the three equations. In order of decreasi…
The concept of lamellar, crystalline polymers with molecular ends and comonomer components included in the crystal lattice as defects has been used to derive a relationship between first-order transition temperature, comonomer content, molecular weight, and lamellar thickness. The relationship is reduced to equations…
Abstract N‐Alkyl quaternary ammonium compounds inhibit the acid corrosion of steel, the effectiveness increasing regularly with alkyl chain length between 4 and 16 carbon atoms. The inhibition obtained with the longer chain compounds shows considerable persistence after treated samples are transferred to a pure acid b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBatch and Continuous Thickening. Basic Theory. Solids Flux for Rigid SpheresP. T. Shannon, Elwood Stroupe, and E. M. ToryCite this: Ind. Eng. Chem. Fundamen. 1963, 2, 3, 203–211Publication Date (Print):August 1, 1963Publication History Published online1 May 2002Published ini…
Abstract Deuterated analogs of polyvinyl chloride (PVC) have been prepared and their infrared spectra analyzed as an aid to the more detailed assignment of bands in the spectrum of PVC. The following deuterated polymers were studied: PVC‐α d 1 , PVC‐β d 1 , PVC‐αβ d 2 , and PVC‐ d 3 . These, as well as PVC, were polym…
The normal tungstates (R2O3·3WO3) of all rare-earth elements have been prepared as well as the 1:1 oxytungstates (R2O3·WO3) of all except Sc and Ce. Physical properties were studied with particular emphasis on luminescence.
An applied field of 105 V/cm produces electron emission from apparently smooth surfaces at room temperature. It is found experimentally that this prebreakdown emission is independent of emitter temperature up to 1000°K. Using a shadow electron microscope, projections about 2 μ high capable of producing field enhanceme…