Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

m;lijo;j;okj'pk'pk;ojlijlkhkjgbhbkjnlk, Exams of Chemistry

,m.jjhlikhnj;ojkolk;ojkigydtdjvkjblkj;ojpoihuigyfrystrschbjnkml;k;kojigyuftdtfhkb

Typology: Exams

2016/2017

Uploaded on 12/29/2017

akshat-khanna
akshat-khanna 🇮🇳

1 document

1 / 2

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Primitive cell
A primitive cell is a unit cell that contains exactly one lattice point. It is the
smallest possible cell.[5] If there is a lattice point at the edge of a cell and thus
shared with another cell, it is only counted half. Accordingly, a point located on
the corner of a cube is shared by 8 cubes and would count with 1/8.
In solid state physics, a primitive cell is a minimum volume cell (a unit cell) corresponding
to a single lattice point of a structure with discrete translational symmetry. The concept is
used particularly in describing crystal structure in two and three dimensions, though it
makes sense in all dimensions. A lattice can be characterized by the geometry of its
primitive cell.
The primitive cell is a primitive unit. A primitive unit is a section of the tiling (usually a
parallelogram or a set of neighboring tiles) that generates the whole tiling using only
translations, and is as small as possible.
The primitive cell is a fundamental domain with respect to translational symmetry only. In
the case of additional symmetries a fundamental domain is smaller.
2-dimensional primitive cell
A 2-dimensional primitive cell is a parallelogram, which in special cases may have
orthogonal angles, or equal lengths, or both.
2-dimensional primitive cells
Parallelogram Rhombus
(Orthorhombic) (Monocinic)
Rectangle Square
(Orthorhombic) (Tetragonal)
3-dimensional primitive cell
pf2

Partial preview of the text

Download m;lijo;j;okj'pk'pk;ojlijlkhkjgbhbkjnlk and more Exams Chemistry in PDF only on Docsity!

Primitive cell

A primitive cell is a unit cell that contains exactly one lattice point. It is the

smallest possible cell. [5]^ If there is a lattice point at the edge of a cell and thus

shared with another cell, it is only counted half. Accordingly, a point located on

the corner of a cube is shared by 8 cubes and would count with 1/ 8.

In solid state physics, a primitive cell is a minimum volume cell (a unit cell) corresponding to a single lattice point of a structure with discrete translational symmetry. The concept is used particularly in describing crystal structure in two and three dimensions, though it makes sense in all dimensions. A lattice can be characterized by the geometry of its primitive cell.

The primitive cell is a primitive unit. A primitive unit is a section of the tiling (usually a parallelogram or a set of neighboring tiles) that generates the whole tiling using only translations, and is as small as possible.

The primitive cell is a fundamental domain with respect to translational symmetry only. In the case of additional symmetries a fundamental domain is smaller.

2-dimensional primitive cell

A 2-dimensional primitive cell is a parallelogram, which in special cases may have orthogonal angles, or equal lengths, or both.

2-dimensional primitive cells

Parallelogram Rhombus

(Orthorhombic) (Monocinic)

Rectangle Square

(Orthorhombic) (Tetragonal)

3-dimensional primitive cell

A crystal can be categorized by its lattice and the atoms that lie in a primitive cell (the basis ). A cell will fill all the lattice space without leaving gaps by repetition of crystal translation operations.

A 3-dimensional primitive cell is a parallelepiped, which in special cases may have orthogonal angles, or equal lengths, or both.

3-dimensional primitive cells

Parallelepiped Oblique rhombic prism Oblique rectangular prism

(Triclinic) (Monoclinic) (Monoclinic)

Right rhombic prism (Orthorhombic)

Rectangular cuboid (Orthorhombic) Square cuboid (Tetragonal)

Trigonal trapezohedron (Rhombohedral)

Cube (Cubic)