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The strictest form of order in a solid is lattice periodicity: a certain pattern (the arrangement of atoms in a unit cell) is repeated again and again to form a translationally invariant tiling of space. This is the defining property of a crystal. Possible symmetries have been classified in 14 Bravais lattices and 230 space groups.

The strictest form of order in a solid is lattice periodicity: a certain pattern (the arrangement of atoms in a unit cell) is repeated again and again to form a translationally invariant tiling of space. This is the defining property of a crystal. Possible symmetries have been classified in 14 Bravais lattices and 230 space groups.

固体中秩序的最严格形式是'''晶格周期性''': 某种模式('''<font color="#ff8000">单元格 Unit Cell</font>'''中原子的排列)一次又一次地重复，形成一个平移不变的空间'''<font color="#ff8000">平铺 Tiling</font>'''。这就是'''<font color="#ff8000">晶体 Crystal</font>'''的定义属性。可能的对称性已在14个'''<font color="#ff8000">布拉维斯晶格 Bravais Lattice</font>'''和230个'''<font color="#ff8000">空间群 Space Group</font>'''中分类。

固体中秩序的最严格形式是'''晶格周期性''': 某种模式( '''<font color="#ff8000">单元格 Unit Cell</font>''' 中原子的排列)一次又一次地重复，形成一个平移不变的空间'''<font color="#ff8000">平铺 Tiling</font>'''。这就是'''<font color="#ff8000">晶体 Crystal</font>'''的定义属性。可能的对称性已在14个'''<font color="#ff8000">布拉维斯晶格 Bravais Lattice</font>'''和230个'''<font color="#ff8000">空间群 Space Group</font>'''中分类。

It is a thermodynamic entropy concept often displayed by a second-order phase transition. Generally speaking, high thermal energy is associated with disorder and low thermal energy with ordering, although there have been violations of this. Ordering peaks become apparent in diffraction experiments at low energy.

It is a thermodynamic entropy concept often displayed by a second-order phase transition. Generally speaking, high thermal energy is associated with disorder and low thermal energy with ordering, although there have been violations of this. Ordering peaks become apparent in diffraction experiments at low energy.