Download Amorphous Metals and Semiconductors. Proceedings of an by P. Haasen, R. I. Jaffee PDF

By P. Haasen, R. I. Jaffee

Amorphous Metals and Semiconductors includes the court cases of a global workshop held at Coronado, California, united states on may possibly 12-18, 1985. prepared into 5 elements, this e-book first appears to be like into the old standpoint on semiconductors and metals. This publication then explains the glass formation, magnetic glasses, and amorphous semiconductors. The mechanical and chemical homes of those fabrics also are given.

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9. 34 Mercier and Levy The peaks are broad, have constructed a 3d Penrose lattice by a projection technique, and plotted its pair distribution function. The peaks are much sharper than that in 38 Relative Frequency Fig. 8. Diffraction normal to the five-fold symmetry axis for the Mosseri-Sadoc model. Distance Fig. 9. Radial distribution function for the Mosseri-Sadoc model. Fig. 9, presumably reflecting the infinite translational correlation length in the Penrose tilings. The peak at Jt. times the near neighbor distance in the Mercier-Levy pair distribu- tion functions is due to the existence of nearly perfect ootdkedra in the Penrose tiling.

B19, 2775 (1979). 33. T. Ichikawa, Phys. Status Solidi A19, 707 (1983). 34. D. S. Levy, Phys. Rev. B21_, 1292 (1983). DISCUSSION on P a p e r by D . R. Nelson STEINHARDT: I have two comments w h i c h you are w e l c o m e to respond to: (1) The intuition for your m o d e l of g l a s s is based largely on the idea of f r u s t r a t i o n -the f r u s t r a t i o n produced w h e n you try to pack twelve i d e n t i c a l s p h e r e s around a thirteenth (identical) s p h e r e . On the o t h e r hand, as Bill J o h n s o n has pointed out, most m e t a l l i c g l a s s e s involve two or m o r e atoms of rather d i f f e r ent s i z e s .

T h e model was originally conceived as way of flattening the ideal icosahedral 37 crystal (polytope {3,3,5}) imbedded in the curved surface of a four-dimensional sphere. The flattening is achieved by introducing successive generations of -72° wedge disclination lines according to certain rules. Locally, the particles form slightly distorted tetrahedra, which combine to form icosahedra threaded by the disclination network. The Mosseri-Sadoc model may be obtained working directly in flat space. We start by combining twenty tetrahedra to form a regular icosahedron of thirteen particles.

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