Structure de La6Cu2Si2S14
Collin Gaston, Laruelle Pierre. Structure de La6Cu2Si2S14. In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 94, 2, 1971. pp. 175-176.
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Elastic constants of triclinic copper sulphate pentahydrate crystals
Using an iterative technique to obtain the exact solutions of the cubic Christoffel equation, the 21 elastic constants of copper sulphate pentahydrate have been determined at 25°C by the ultrasonic pulse echo method. The elastic constants, referred to the IRE recommended system of axes, are c 11 =5·65, c 12 =2·65, c 1…
Grain Size Dependence of Yield Stress and Flow Stress in the Age-Hardened Magnesium–Zinc Alloy
The grain size dependence of yield stress and flow stress in the quenched and aged magnesium-3 wt% zinc alloy was studied by the tensile test and the electron and optical microscopic observations in the temperature range from room temperature to −195°C. The main results obtained are as follows:(1) This alloy does not…
Algumas Diatomáceas encontradas em Bromeliáceas, Brasil
<abstract language="eng">For the first time the Diatom flora of Bromeliaceae was investigated in the States of Rio de Janeiro and Guanabara. A total of 35 species was determined from 32 samples collected in Bromeliaceae of the genus Conistrum, Vriesia and Billbergia. Some ecological factors are also here considered.
2-Lithioadamantane
Previous investigations have shown that matallic derivatives of bridgehead substituted adamantane compounds do not possess enough stability to be synthetically useful. Intial attempts to prepare such derivatives from 2-bromoadamantane at elevated tamperatures also failed, where-as treatment of this compund with methyl…
On the Measurement of Strain Distribution in Wood under the Axial Tension Force by X-Ray Diffraction
Under the axial tensile force in the fiber direction the distribution of crystal lattice strain in the b-axis direction of the cellulose (I) in the cell wall of tracheids were measured by the X-ray diffraction technique using (040) reflection of cellulose micelles.In this study the transit X-ray method was used and th…
Synthesis of meso-ionic anhydro-2-arylamino-1,3,4-oxadiazolium hydroxides
The synthesis and characterisation of anhydro-2-arylamino-1,3,4-oxadiazolium hydroxides (II), a new class of meso-ionic compounds, is described.
Contribution à l'étude du système quaternaire KClRbClCsClH2O: II. L'isotherme de 25°C
Abstract The experimental study at 25°C of the system KClRbClCsClH 2 O has shown the existence of a new type of quaternary system with formation of mixed crystals. — The solubility diagram is characterized by the presence of one univariant line and one binary miscibility gap. Two types of solid solutions are presen…
La hakite, un nouveau minéral du groupe de la tétraédrite
Cubique, isotype de la tétraédrite, a = 10,88 ± 0,01 Å ; Z = 8, dx = 6,3. Les raies les plus intenses du diagramme de poudre sont : 3,140(10) ; 2,910 (7) ; 1,985 (7) ; 1,925 (9) ; 1,639 (8) Å. Les analyses chimiques (microsonde électronique) donnent : Cu 26,6 (26,6) ; Hg 15,3 (14,3) ; Sb 15,5 (19,1) ; As 3,2 (0,7) ; S…
High Pressure Phase Diagram of Al-Si System
A phase diagram of Al-Si system in the hypoeutectic region at 28kb has been composed. A girdle-type high pressure device was used to press and heat the specimens, and an electric resistance method to detect the phase transitions. The characteristic figures obtained are as follows;(1) The melting point of pure Al has b…
Phase Equilibria and Eu2+-, Tb3+-, and Mn2+-Activated Luminescent Phases in the CaO-MgO-P[sub 2]O[sub 5] System
The ternary subsolidus phase equilibria has been determined for that portion of the system containing less than 50 m/o (mole per cent) . Limits of solid solution along the orthophosphate join were determined for , , and . The 3:3:2 compound had a rapid, reversible inversion at 1104°C and melted incongruently at . melt…
STUDIES ON THE ANTI-OVULATORY AND OVULATORY ACTION OF CLOMIPHENE CITRATE IN THE RAT
Summary. To study the site and mechanism of its ovulation-inhibiting effect, clomiphene citrate was implanted bilaterally into the hypothalamus and hypophysis of adult di-oestrous rats and of prepuberal females which were also treated with oestradiol benzoate. The results suggest that this effect is primarily due to t…
Hexanitrolanthanates(III)
Unit-cell parameters have been measured for some alkali-metal hexanitrolanthanates. The electronic spectra of these complexes closely resemble that of NaNO2, as expected for very weak lanthanide–nitrite bonding, although the lowest triplet absorption is much more intense than in NaNO2. Ce(NO2)63– shows metal–ligand el…
Scanning Electron Microscopic Study of Cholesterol Gallstones
The latest techniques in scanning electron microscopy have been applied to this study. In cholesterol gallstones, the fracture surface generally shows a crystalline plane radiating pattern, often showing dendritic growth, around the nucleus. On the surface or fracture plane of a cholesterol stone, parallelogram crysta…
Atomic and molecular beam scattering from macroscopically rough surfaces
The scattering of thermal energy atomic and molecular beams from macroscopically rough surfaces has been found to display scattered flux distributions that are typically skewed towards the incoming, beam i.e., backscattered. Such an observation is consistent with the results reported in the literature describing flow-…
Interdiffusion in Cobalt-Nickel Alloys
Interdiffusion in Co-Ni alloys was studied in the temperature range between 880° and 1300°C, using diffusion couples of pure cobalt and nickel. Matano’s method was employed to determine the interdiffusion coefficient, \ ildeD, as a function of concentration.It was found that above 1190°C, \ ildeD behaved as in an idea…
Étude par Diffraction‐X de Quelques Composés du Système Nicote Obtenus par Synthèse Thermique
Abstract We have studied the compounds with metal/tellurium ratio less or equal to unity in the ternary system NiCoTe. The limits of the homogeneity range of the hexagonal (Ni, Co) 1–x Te phase have been fixed for different Ni/Co ratios. The compounds formed in the series (Ni λ Co 1–x ) 0,75 Te and (Ni x Co 1–x ) 0,…
Über die elektronenmikroskopische Abbildung von Amylosefibrillen und Sternmolekülen aus Glykogen als Jodkomplex
Abstract Electron Microscopic Studies of Amylose Fibrils and Star‐Shaped Molecules Derived from Glycogen in the Form of the Iodine Complex. The amylose‐iodine complex crystallizes in the form of fibrils with uniform diameters of 40 Å. From very diluted solutions single rodlike molecules of the same diameter are obtain…
The planar Hall effect in thin foils of Ni-Fe alloy
The planar Hall effect in ferromagnetic Ni-Fe alloys (Ni content at 100%, 80% and 50%) is observed. At room temperature it is found that in addition to the quadratic dependence on magnetization there also exists a parabolic dependence on the applied field for a field above the magnetic saturation. This is explained by…
Phase Equilibria and Tin-Activated Luminescence in the System Ca[sub 3](PO[sub 4])[sub 2]-Ba[sub 3](PO[sub 4])[sub 2]
The phase diagram for the system has been determined in detail. Although no intermediate compounds were found in the system, two extensive solid solution regions having the and structures were found to exist. is a newly discovered polymorph stable above 1390°C. The divalent tin‐activated luminescence of various phases…