Vibration of crystal with monoatomic basis || Monoatomic lattice vibration || Optical Vibration ||

Zii Science
Zii Science
1.8 هزار بار بازدید - 4 سال پیش - The vibration of a crystal
The vibration of a crystal with a monoatomic basis refers to the small oscillations of the atoms in the crystal lattice about their equilibrium positions due to thermal energy. These vibrations are known as phonons and are responsible for many properties of crystals, including thermal conductivity, elasticity, and electrical conductivity. In a crystal with a monoatomic basis, the atoms are all identical and are arranged in a regular, repeating pattern. The vibrations of these atoms can be described by the normal modes of vibration, which are solutions to the equations of motion for the crystal lattice. Each normal mode is characterized by a specific frequency and a specific pattern of atomic displacement. The most common type of vibration in a crystal is the longitudinal vibration, also known as the longitudinal acoustic phonon, in which the atoms oscillate parallel to the direction of propagation of the wave. This type of vibration has a lower frequency than the transverse vibration, also known as the transverse acoustic phonon, in which the atoms oscillate perpendicular to the direction of propagation of the wave. In addition to the longitudinal and transverse acoustic phonons, there are also optical phonons, which have higher frequencies and are associated with changes in the bond lengths or angles in the crystal lattice. The vibrations of the crystal lattice can have an impact on the electronic properties of the crystal. For example, the vibrations can cause changes in the electronic band structure, which can lead to changes in the electrical conductivity of the crystal. Additionally, the vibrations can cause changes in the electron-phonon interaction, which can affect the thermal conductivity of the crystal. In summary, the vibration of a crystal with a monoatomic basis refers to the small oscillations of the atoms in the crystal lattice caused by thermal energy. These vibrations are known as phonons, and they are responsible for many properties of crystals, including thermal conductivity, elasticity, and electrical conductivity.
4 سال پیش در تاریخ 1399/05/01 منتشر شده است.
1,882 بـار بازدید شده
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