Lindemann index

The Lindemann index is a measure used in the field of solid-state physics to quantify the degree of disorder in a crystalline material. It is named after F. Lindemann, who proposed it in the early 20th century. The index is often related to the concept of melting and phase transitions in materials. In essence, the Lindemann index provides a numerical value that reflects how much the atoms in a crystal vibrate around their equilibrium positions.