Question

Difference between crystal lattice and unit cell 2

Answer 1

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Answer 2

Crystal Lattice

Crystal Lattice is a three-dimensional representation of atoms and molecules arranged in a specific order/pattern. In other words, a crystal lattice can be defined as a geometrical arrangement of constituent particles of matter (atoms, ions or molecules) as points in space. There are total 14 possible three-dimensional lattices. Crystal lattices are also known by Bravais Lattices, named after the scientist Auguste Bravais

Characteristics of Crystal Lattices

The following characteristics are depicted by Bravais lattices:

Each point in a lattice represents a lattice site or we can say lattice point

Each point denotes a particular type of constituent particles of matter be it an atom, molecule or an ion

By joining the lattices points inside the lattice we can define geometry of the lattice


Unit cell

The smallest possible portion or part of the crystal lattice which repeats itself in different directions of the lattice is called the unit cell. Many unit cells combine to geometrically form the crystal lattice.

Characteristics of Unit Cell

The following characteristics define a unit cell:

A unit cell has three edges a, b and c and three angles α, β and γ between the respective edges

The a, b and c may or may not be mutually perpendicular

The angle between edge b and c is α, a and c is β and that of between a and b is γ

Unit cells are of two types namely:

Primitive Unit Cells

Centred Unit Cells