晶格振动
材料科学
声子
格子(音乐)
离子晶体
凝聚态物理
振动
离子键合
物理
Crystal(编程语言)
分子物理学
出处
期刊:World Scientific series in 20th century physics
日期:2000-01-01
卷期号:: 57-59
标识
DOI:10.1142/9789812793720_0005
摘要
LATTICE vibrations in ionic crystals are usually treated with the unretarded Coulomb forces. Despite some discussions in the existing literature1,2, the precise nature of the effect due to retardation remains unknown. We have found that explicit solution of the problem is possible for diatomic crystals with optical isotropy, mainly because the lattice vibrations concerned are very long waves, for which the lattice behaviours can be described by the following equations3: where w is the displacement of the positive ions relative to the negative, multiplied by the square root of the ratio of the reduced mass of the ions to the lattice cell volume; P and E are the dielectric polarization and the electric field; ɛ0, ɛ∞ and ω0 are the static and high-frequency dielectric constants and the infra-red dispersion frequency (circular).
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