Download PDF by Alexander L. Fetter: Classical Electromagnetism

By Alexander L. Fetter

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Fractions of Voronoi polyhedra around (a) La, (b) Al and (c) Ni obtained from the RMC-simulated structure for as-formed specimen of the La55 Al25 Ni20 alloy. fitting of the experimental pair distribution function peaks at (a) 430 K and (b) 465 K. As the annealing temperature increases, the Al-Ni (also Ni-Ni, Al-Al) correlation develops together with the La-La correlation. This shows that the local atomic structural change is towards phase separation in the supercooled liquid region. The large negative heat of mixing between aluminium and Copyright © 2005 IOP Publishing Ltd.

The resulting medium range order and matrix structures are then relaxed energetically using Lennard-Jones (L-J) potentials. 61 g/cm3 by interpolating the experimental densities of the amorphous Pd-Si alloys [19]. The total number of atoms for all the initial structures is 2500. Pair distribution function According to diffraction theory [7], a reduced interference function FðQÞ is defined as FðQÞ ¼ ½IðQÞ ÿ Nh f 2 iŠQNh f i2 ¼ ½Iobs ðQÞ ÿ BGðQފQh f 2 iBGðQÞh f i2 ð2:1Þ where IðQÞ and Iobs ðQÞ are the actual and observed elastic scattering intensities, r is the atomic radial distance, N is the total number of atoms, Q ¼ ð4=Þ sin  is the scattering vector,  is the half scattering angle,  is the electron wave length, and BGðQÞ the background intensity which Copyright © 2005 IOP Publishing Ltd.

Two medium range order Si contents of 9 and 18 at% are considered. 9 nm (averaged size evaluated from high-resolution electron microscopy). The medium range ordered regions are randomly distributed with random orientations in a structural cell (3:305 Â 3:305 Â 3:305 nm) under the defined Af . The intervening open space between the medium range ordered regions is then filled with Pd and Si randomly by taking both the total atomic concentration and the density into consideration. The resulting medium range order and matrix structures are then relaxed energetically using Lennard-Jones (L-J) potentials.

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Classical Electromagnetism by Alexander L. Fetter


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