Materials Literature
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X-ray studies of mica specimens from a variety of geological localities show that biotite and certain lithium-rich mica samples are composed of a mixture of different polytypes. Many of the biotite structures are new complex polytypes not before reported. A new method of designating mica polytypes is proposed. Techniq…
The superconducting transition temperature of stoichiometric ${\mathrm{La}}_{3}$${\mathrm{S}}_{4}$ has been measured by two different methods and has been found to be (8.25\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode^\circ\else\textdegree\fi{}K. A range of superconducting compositions exists in the metal-rich end of the $…
We report measurements of the spin-lattice relaxation rate ${{T}_{1}}^{\ensuremath{-}1}$ for several magnetically dilute rare-earth ions in the temperature range $1.2\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\leqq}T\ensuremath{\leqq}5\ifmmode^\circ\else\textdegree\fi{}$K, using the transient recovery of the micro…
Abstract Niobpentoxid kristallisiert in zahlreichen Modifikationen. Die Arbeit bringt einen Überblick, insbesondere über die Bildungsweisen, die Strukturen und das thermische Verhalten.
A new tungsten boride has been prepared and has been assigned the formula WB(2). The assignment is based on comparison of the x-ray diffraction data of this boride with those of diborides of the AlB(2) type structure. Values of a(0) = 3.02 and c(0) = 3.05 were calculated for a hexagonal unit cell.
Averbuch-Pouchot Marie-Thérèse, Tordjman Isaac, Durif-Varambon André. Données cristallographiques sur trois nouveaux trimétaphosphates de type benitoïte : (PO3)3 Cd MI (MI = Ag, Tl et Rb). In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 89, 3, 1966. pp. 405-406.
J. N. Bradley, Chem. Commun. (London), 1966, 175 DOI: 10.1039/C19660000175
Changes in dislocation arrangement and twin faults formation by quenching and tempering of a Ti-9% Ta alloy were investigated by means of internal friction measurements and transmission electron microscopy. It has been found that typical needle-like martensite structures were produced by quenching from the β region, a…
Durif-Varambon André, Grenier Jean-Claude, Averbuch-Pouchot Marie-Thérèse, Tranqui Duc. Forme rhomboédrique des métaphosphates du type (PO3)3MIIK (MII = Co, Ni, Mg, Zn). In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 89, 2, 1966. pp. 273-274.
Identification of kaolin minerals by D.T.A., X-ray diffraction, electron microscopy is sometimes unfeasible, mainly as far as low -crystallized forms are concerned. It can be the case with fire-clay, metahalloysite or intermediate forms. Infrared spectroscopy in the OH vibration band and Al-O-H deformation band region…
Depression in the transition temperature of Glauber's salt due to the presence of WO42– and its polyanions have been measured at different pH values. The average degrees of condensation calculated from these measurements indicate the existence of mono-, tri-, and hexa-polytungstates. Polymerisation towards WO3 takes p…
The imjJortance oj inclusions in steel has been velY milch ellljJhasi;:ed, and many investigations have been carried out, but in most cases too 1Ilalry variables have been jJresented to draw wry definite conclusion.
A further study has been made of the curling during growth of thin crystal plates of 2,5-di-t-butyl-1,4-dimethoxybenzene, and this behaviour has been related to the approximate structure of the compound deduced from its optical properties. It is suggested that the curling may be due to differential adsorption of the s…
Absorption spectra of Mn2+ ion in alumino-boro-phosphate, magnesium-aluminoborate and soda-lime-silica glasses were studied within the range, 16000 cm-1 30000 cm-1 Five absorption bands were observed at or around 19200 cm-1 [4Γ4(G)], 23300 cm-1 [4Γ5(G)], 24000 cm-1 [4Γ3,4Γ1 (G)], 28100 cm-1 [4Γ5 (D)] and 29300 cm-1 [4…
By means of high-frequency conductance measurements, the rates of the alkaline hydrolyses of ethylene and propylene carbonates have been determined at 15, 25, and 35°. The rate constants found are considerably greater than those previously reported, and a source of error in the earlier determinations is discussed. The…
The processes of precipitation in Cu-Cr binary alloys with 0.05∼0.91 wt%Cr have been investigated by electrical resistivity, hardness and transmission electron microscopy, with the following results: (1) Increase in electrical resistivity due to clustering of solute atoms or zone formation is not detected at above/300…
The study of the clay minerals in the Tchad solodized solonetzes and in the associated vertisols has been realized by X-ray diffraction analysis. The neoformation, stability and weathering of the montmorillonites characterizing these soils are herein described.
The relationship between the geometrical structures of plain-woven filament fabrics and the directional effect of fabric-on-fabric static friction has been investigated with the following results:(1) Frictional force F per unit area for every relative direction of rubbing is related to pressure N by the relation F=kNn…
A resistance heated crystal puller has been used to grow crystals of NbO, Ti2O3, and Al2O3, which have melting points of 1945, 2000, and 2050°C, respectively. The puller incorporates a modified version of a tantalum tube furnace described previously, which is capable of operating in oxidizing, neutral, and reducing at…
The roots of Cynanchum wilfordi HEMSLEY were found to contain a glycoside mixture. The glycosides showed a positive Keller-Kiliani reaction, suggesting the presence of a 2-deoxysugar. The sugar portion of the glycoside was found to be D-cymarose. The aglycone was shown to be an ester. Alkaline hydrolysis of the ester…