1 - EMA 4144 Physical Ceramics Background, Bonds, Energy...

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EMA 4144 Physical Ceramics Background, Bonds, Energy Bands, Models, Crystals and Chemistry Slides modified and adapted by W. Sigmund – originally assembled by Juan Nino
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Objectives for S2 • Revise basic crystallographic concepts from EMA3010 and EMA3050. • Generalize crystal density calculations. evise atomic bonding considerations • Revise atomic bonding considerations as applied to ceramic materials. 2 Wolfgang Sigmund - EMA 4144 Physical Ceramics - August 27, 2009
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3D Coordinate System Lattice: coordinate axes z + unit cell parameters z 1,1,1 y 0,0,0 x x y Wolfgang Sigmund - EMA 4144 Physical Ceramics - August 27, 2009 3
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Crystal Systems System Axial Lengths & Angles Unit Cell Cubic a = b = c, = = = 90° Tetragonal a = b c, = = = 90° Orthorhombic a b c, = = = 90° 4 *from Shackelford Wolfgang Sigmund - EMA 4144 Physical Ceramics - August 27, 2009
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Crystal Systems System Axial Lengths & Angles Unit Cell Rhombohedral a = b = c, = =  90° Hexagonal a = b c, = = 90°, = 120° onoclinic , = = 90° Monoclinic riclinic a b c, 90   0 5 *from Shackelford Triclinic a b c,       90° Wolfgang Sigmund - EMA 4144 Physical Ceramics - August 27, 2009
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Lattice Definition : A lattice is an array of points in space in which the environment of each point is identical. Can you identify hich of the which of the following are lattices? 6 *from Hammond Wolfgang Sigmund - EMA 4144 Physical Ceramics - August 27, 2009
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Definitions Unit cell: If the lattice points are connected by straight lines, a parallelepiped is formed. This is called a unit cell.
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This note was uploaded on 03/04/2010 for the course MSE 4144 taught by Professor Sigmund during the Spring '10 term at University of Florida.

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1 - EMA 4144 Physical Ceramics Background, Bonds, Energy...

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