Be Beryllium: The Element. Physical Properties (continued) by Gudrun Bär, Lieselotte Berg, Gerhard Czack, Dieter Gras,

By Gudrun Bär, Lieselotte Berg, Gerhard Czack, Dieter Gras, Vera Haase, Elisabeth Koch-Bienemann

The current complement quantity Beryllium a three maintains and completes the outline of the actual houses of the point, began in complement quantity A 2, 1991, and likewise treats the electrochemical habit of the steel. the original mixture of the Be homes, which was once mentioned in complement quantity A 2, can also be validated within the following chapters of this quantity a three: thirteen. electric homes 14. digital houses 15. Optical houses. Emission and influence Phenomena sixteen. Electrochemical habit beginning with homes, Be isarather reliable electric conductor in centrast to what can be anticipated. Superconductivity was once studied, specially on motion pictures. Quantum results, that are extra reported in Be than in so much different metals, are the cause of quite a few in­ vestigations of the magnetoresistance and the magnetic-breakdown influence. the foundation for lots of of the attribute houses is the original nature of bonding in Be on account of its bizarre digital constitution and the specific form of its Fermi floor which additionally gave upward thrust to extra a number of experiences. certain cluster calculations have been according to­ shaped to higher comprehend the bonding within the steel. in regards to the optical houses, the excessive reflectivity of Be, fairly within the infrared area, makes it appealing for the fabrication of precision optical surfaces (mirrors); it's also worthwhile for solar-collector surfaces in spacecraft purposes. Emission and electron-and ion­ impression phenomena in addition to neutron optics also are mentioned.

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Extra resources for Be Beryllium: The Element. Physical Properties (continued) and Electrochemical Behavior (Gmelin Handbook of Inorganic and Organometallic Chemistry - 8th edition)

Example text

The role of crystallinity in vapor-quenched Be films could not be definitely determined. Figures are discussed in the paper [2]. A model was proposed to calculate the superconducting transition temperature of very thin films. This model considers the proximity effect between an extremely thin nonsuperconducting surface sheath and the remaining superconducting part of the film. Since Tc is very sensitive to changes of the electron density of states at the Fermi Level, it was assumed that superconductivity is lost because of the drop of the electron density in very thin Layers at the film surface.

026 K was found in a pure (u-)Be sample containing the following impurities (in ppm): 5 N, 10 Si, 15 Al, 5 Mn, 1 Ni, and 3 Fe. The initial slope of the critical magnetic field curve was (68 ± 2) Oe/K [1]. 026 K is usually reported in the literature. 024 K. 10 mK (average of the standard deviation of several samples) [2]. The transition temperature to superconductivity can be used as a temperature reference standard. 5 K was obtained by developing a compact device for temperature calibration. 21 K of five different materials (W, Be, Ir, AuAL 2 , and Auin 2).

Details and tables are given in the paper [12]. Resistivity measurements were performed from 2 to 500 K on Be wires of varying purity (for the impurity contents of BeO, Si, Al, Cr, Mn, Ni, and Fe, see table in the paper), all with a fiber structure close to [1010], and grain sizes in the ranges 10 to 80 and 30 to 200 11m. 2 K on the samples without annealing and after vacuum (1 o-s Torr) annealing for 1 h and 150 h at 800' C represent the residual resistivity because the same values were found at 2 K.

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