# Zone axis

### From Online Dictionary of Crystallography

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''uh'' + ''vk'' + ''wl'' = 0 | ''uh'' + ''vk'' + ''wl'' = 0 | ||

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+ | |||

+ | This is the so-called Weiss law. | ||

The indices of the zone axis defined by two lattice planes (<math> h_1, k_1, l_1 </math>), (<math> h_2, k_2, l_2</math>) are given by: | The indices of the zone axis defined by two lattice planes (<math> h_1, k_1, l_1 </math>), (<math> h_2, k_2, l_2</math>) are given by: | ||

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</math> | </math> | ||

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+ | Conversely, any crystal face can be determined if one knows two zone axes parallel to it. It is the zone law, or ''Zonenverbandgesetz''. | ||

Three lattice planes have a common zone axis (''are in zone'') if their Miller indices (<math> h_1, k_1, l_1 </math>), (<math> h_2, k_2, l_2</math>), (<math> h_3, k_3, l_3</math>) satisfy the relation: | Three lattice planes have a common zone axis (''are in zone'') if their Miller indices (<math> h_1, k_1, l_1 </math>), (<math> h_2, k_2, l_2</math>), (<math> h_3, k_3, l_3</math>) satisfy the relation: | ||

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+ | == History == | ||

+ | |||

+ | The notion of zone axis and the zone law were introduced by the German crystallographer Christian Samuel Weiss in 1804. | ||

== See also == | == See also == |

## Revision as of 04:49, 2 July 2013

Axe de zone (*Fr*); Zonenachse (*Ge*); Eje de zona (*Sp*); Ось зоны (*Ru*); Asse di zona (*It*); 晶帯軸 (*Ja*).

## Definition

A zone axis is a lattice row parallel to the intersection of two (or more) families of lattices planes. It is denoted by [*u* *v* *w*]. A zone axis [*u* *v* *w*] is parallel to a family of lattice planes of Miller indices (*hkl*) if:

*uh* + *vk* + *wl* = 0

This is the so-called Weiss law.

The indices of the zone axis defined by two lattice planes (*h*_{1},*k*_{1},*l*_{1}), (*h*_{2},*k*_{2},*l*_{2}) are given by:

Conversely, any crystal face can be determined if one knows two zone axes parallel to it. It is the zone law, or *Zonenverbandgesetz*.

Three lattice planes have a common zone axis (*are in zone*) if their Miller indices (*h*_{1},*k*_{1},*l*_{1}), (*h*_{2},*k*_{2},*l*_{2}), (*h*_{3},*k*_{3},*l*_{3}) satisfy the relation:

## History

The notion of zone axis and the zone law were introduced by the German crystallographer Christian Samuel Weiss in 1804.