11 overheads bravais miller - Primitivelatticevs...

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Cubic Bravais lattices are not all primitive cells i i t i ll ti b df ii t i l lt t i it Primitive lattice vs conventional lattice cc Primitive cells contain, by definition only one lattice point bcc conventional cell vs primitive Rhombohedron primitive cell Primitive translation vectors for bcc 1 ) ˆ ˆ ˆ ( 2 1 z y x a a ) ˆ ˆ ˆ ( 2 1 ) ˆ ˆ ˆ ( 2 z y x a c z y x a b
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Primitive lattice vs conventional lattice fcc hcp fcc hcp conventional cell vs primitive hombohedral rimitive cell Rhombohedral primitive cell Angles between axes are 60 o ) ˆ ˆ ( 2 1 y x a a Primitive anslation Solid State Physics, C. Kittel ) ˆ ˆ ( 2 1 ) ˆ ˆ ( 2 1 z x a c z y a b translation vectors
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Lattice with a Basis onsider the following lattice Consider the following lattice: • Clearly it is not a Bravais lattice (in a Bravais lattice, the b h lattice must look exactly the same when viewed from any lattice point) c • It can be thought of as a Bravais lattice with a basis consisting of more than just one atom per lattice point–two atoms in this case. So associated with each point of the underlying Bravais lattice there are two atoms. Consequently, each primitive cell of
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11 overheads bravais miller - Primitivelatticevs...

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