Describe This Structure As A Attice And A Basis

An atom or a group of atoms associated with each lattice point in crystal.

Describe this structure as a attice and a basis.

Clearly it is not a bravais lattice in a bravais lattice the lattice must look exactly the same when viewed from any lattice point 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. Usually the basis consists of an atom a group of atoms or a molecule. It does not matter where the basis is put in relation to a lattice point. Lattice with a basis consider the following lattice.

Thus in fig 2 the basis is represented by the two atoms a and a1. A basis is a collection of atoms in particular fixed arrangement in space. Crystal lattices can be classified as either monatomic or polyatomic. A lattice is a hypothetical regular and periodic arrangement of points in space.

3 8 from kittel the crystal structure is formed by the addition of the basis b to the lattice points of the lattice a. Lets see how a two dimensional lattice may look. Translationally periodic arrangement of points in space. If there is only one type of.

1 diamond structure fig. The basis is a set of atoms which is located near each site of a bravais lattice. Translationally periodic arrangement of atoms in space. This generates a structure that is referred to as a crystal a crystalis defined as a latticewith a basisadded to each lattice site.

In a general case crystal structure can be considered as crystal structure lattice basis. The lattice is defined by fundamental translation vectors. When incorporated into a building code prescriptive sometimes called cookbook construction requirements can be easily followed by a builder and inspected by a code official without the services of a design professional. This classification is based on the kind of atoms present in the face within a lattice structure.