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2.1 Basics of Structures

Structure and lattice – what is the difference?

Example:
structure and lattice

in 2D

• Lattice

• pattern of points

• no chemical information, mathematical description

• no atoms, but points and lattice vectors (a, b, c, , , ), unit cell

• Motif (characteristic structural feature, atom, group of atoms…)

• Structure = Lattice + Motif

• contains chemical information (e. g. environment, bond length…)

• describes the arrangement of atoms