朗之万函数与布里渊函数的一些近似公式的推导

Deduce some Approximate Formulate of Langevin Function and Brillouin Function

朗之万函数与布里渊函数在固体物理学和统计力学中是两个非常重要的函数,但多数文章只是直接给出了朗之万函数与布里渊函数的一些近似公式,并没有对其进行推导,本文导出了朗之万函数与布里渊函数的一些近似公式,使广大初学者对这两个函数有一个全面的认识。

Langevin function and Brillonin function are two important function in solid physics and safics mechanics. But many thesises only have directly some approximare formulate formula about Langevin function and Brillonin function not given deduction. The aim of the thesises is to draw a conclusion from above these. In Order to have a comprehensive understanding for many beginners,the thesises will give a appraximare formttlate about the Langevin function and Brillouin function.