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Lect21_notes

prototype structures cscl or b2 structure more

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Unformatted text preview: ures! BCC: Body-Centered Cubic Structure! ! ! ! Prototype Structures! CsCl or B2 structure! ! More compounds of AB stoichiometry crystallize in this geometry than any other type.! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Can be thought of as an ordered BCC, but is primitive cubic! Basis is two atoms.! Structure is primitive cubic.! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 21 ! 5 Prototype Structures! L10 Structure! Many intermetallic compounds of 1:1 stoichiometry crystallize in this structure.! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! A base centered tetragonal Bravais lattice does not exist, and therefore the structure is primitive with four atoms in the basis!!! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 21 ! 6 Prototype Structures! L12 Structure! Compounds of 1:3 stoichiometry (AB3) may crystallize in this structure.! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Can also be thought of as an ordered close packed structure. However, it is also a primitive cubic structure. The basis here is four atoms; one formula unit.! C...
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