Calculated Cohesive Energy Of The Ordered Copper Gold Alloy Cu Au I
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Author | : Richard Worrell Hannum |
Publisher | : |
Total Pages | : 166 |
Release | : 1966 |
Genre | : Gold-copper alloys |
ISBN | : |
"The chief purpose of cohesive energy calculations is to develop analytical methods which give a valid theoretical basis for cohesion, which explain why the ordered alloy has the observed crystal structure, and which give numerical results in agreement with the measured values. The distribution of electrons around the atoms is known only approximately in most crystal lattices, and cohesive energy calculations are very sensitive to the electron distribution assumed. The net cohesive energy depends chiefly upon the difference between two larger quantifies, the boundary energy of a valence electron, which promotes cohesion, and the Fermi energy, which opposes it. A calculation of correct values of cohesive energy indicates that the assumed electron distribution is correct. In the present work, an analysis is made of the nature of binding in the pure metals and the alloy to provide a basis for calculating the energy of binding. The calculations are then made, using the best procedure for each part, and the results are compared with values obtained by experiment. It is found that when account is taken of cohesion from the d-electrons, using the tight-binding approximation, calculated cohesive energies for the pure metals copper and gold are nearer to the experimental values than in previous calculations, which gave too small results. The strong electron binding between unlike atoms also indicates why the alloy has a tetragonal structure while the pure metals are face-centered cubic"--Introduction, leaves 1-2.
Author | : Richard J. Weiss |
Publisher | : Elsevier |
Total Pages | : 438 |
Release | : 2013-10-22 |
Genre | : Science |
ISBN | : 1483139107 |
Metal Physics and Physical Metallurgy, Volume 6: Solid State Physics for Metallurgists provides an introduction to the basic understanding of the properties that make materials useful to mankind. This book discusses the electronic structure of matter, which is the domain of solid state physics. Organized into 12 chapters, this volume begins with an overview of the electronic structure of free atoms and the electronic structure of solids. This text then examines the basis of the Bloch theorem, which is the exact periodicity of the potential. Other chapters consider the fundamental assumption in the solid whereby the bonding electrons between atoms act as nearly harmonic oscillator spring being somewhat stiffer in compression than expansion. This book discusses as well the various properties of the nucleus. The final chapter deals with the different experimental measurements on copper and iron. This book is a valuable resource for metallurgists, experimentalists, and solid state physicists.
Author | : Richard Jerome Weiss |
Publisher | : Garland Science |
Total Pages | : 476 |
Release | : 1990 |
Genre | : Materials |
ISBN | : 9780891169680 |
A new edition of "Solid State Physics for Metallurgists" which is revised to reflect university metallurgy departments' broadening outlook on the subject.
Author | : |
Publisher | : |
Total Pages | : 12 |
Release | : 1967 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 946 |
Release | : 1970 |
Genre | : Dissertations, Academic |
ISBN | : |
Author | : Dereje Seifu |
Publisher | : |
Total Pages | : 312 |
Release | : 1994 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 868 |
Release | : 1966 |
Genre | : Dissertations, Academic |
ISBN | : |
Author | : C. C. Koch |
Publisher | : |
Total Pages | : 584 |
Release | : 1985 |
Genre | : Heat resistant alloys |
ISBN | : |
Author | : University of Missouri--Rolla |
Publisher | : |
Total Pages | : 52 |
Release | : 1965 |
Genre | : Dissertations, Academic |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 214 |
Release | : 1958 |
Genre | : Science |
ISBN | : |