ECE3080-L-2-Unit Cells and Miller Indexes

ECE3080-L-2-Unit Cells and Miller Indexes - Lecture 2 Unit...

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ECE 3080 - Dr. Alan Doolittle Georgia Tech Lecture 2 Unit Cells and Miller Indexes Reading: (Cont’d) Anderson 2 1.8, 2.1-2.7
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ECE 3080 - Dr. Alan Doolittle Georgia Tech The crystal lattice consists of a periodic array of atoms. Unit Cell Concept
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ECE 3080 - Dr. Alan Doolittle Georgia Tech Unit Cell Concept A “building block” that can be periodically duplicated to result in the crystal lattice is known as the “unit cell”.
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ECE 3080 - Dr. Alan Doolittle Georgia Tech Unit Cell Concept A “building block” that can be periodically duplicated to result in the crystal lattice is known as the “unit cell”.
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ECE 3080 - Dr. Alan Doolittle Georgia Tech Unit Cell Concept A “building block” that can be periodically duplicated to result in the crystal lattice is known as the “unit cell”.
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ECE 3080 - Dr. Alan Doolittle Georgia Tech Unit Cell Concept A “building block” that can be periodically duplicated to result in the crystal lattice is known as the “unit cell”.
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ECE 3080 - Dr. Alan Doolittle Georgia Tech The crystal lattice consists of a periodic array of atoms. The smallest “building block” that can be periodically duplicated to result in the crystal lattice is known as the “primative unit cell”. The unit cell may not be unique. Unit Cell Concept A “building block” that can be periodically duplicated to result in the crystal lattice is known as the “unit cell”.
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ECE 3080 - Dr. Alan Doolittle Georgia Tech Unit Cell Concept Lattice Constant: A length that describes the unit cell. It is normally given in Å, angstroms = 1e-10 meters. Diamond Structure: Constructed by 2 “inter-penetrating” FCC Lattices Zincblende is a diamond structure with every other atom a different element. Example: Ga only bonds to As and As only bonds to Ga. QuickTime Movie QuickTime Movie QuickTime Movie QuickTime Movie
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ECE 3080 - Dr. Alan Doolittle Georgia Tech Unit Cell Concept Some unit cells have hexagonal symmetry. Rocksalt unit cells are one of the simplest practical unit cells.
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ECE 3080 - Dr. Alan Doolittle Georgia Tech Atomic Density 3 3 3 3 22 4 . 1 22 41 . 1 ) 8 2 . 5 ( 2 cm atoms e cell unit of Volume cell unit per Atoms of Number Density cm e cm e a cell unit of Volume cell unit per Atoms of Number = = = = = = What is the atomic density of a BCC material with lattice constant 5.2 angstroms?
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ECE 3080 - Dr. Alan Doolittle Georgia Tech Crystalline Planes and Miller Indices
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ECE3080-L-2-Unit Cells and Miller Indexes - Lecture 2 Unit...

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