kristallvõnkumised
Kristallvõnkumised, also known as crystal lattice vibrations or phonons, are collective oscillations of atoms within a crystal structure. These vibrations are not random; they propagate through the crystal as waves, similar to sound waves. At any given temperature above absolute zero, atoms in a crystal are in constant motion, vibrating around their equilibrium positions. These vibrations are quantized, meaning they can only exist in discrete energy levels. The quantum of a lattice vibration is called a phonon.
Phonons play a crucial role in many physical properties of solids. They are responsible for heat conduction