This law states that the magnetic susceptibility χm of a ferromagnetic material in a paramagnetic state can be expressed as a function of absolute temperature T as χm = C /( T - Θ). This law holds true well except in the immediate vicinity of the Curie temperature. C is a material constant called the Curie constant, and Θ is called the paramagnetic Curie temperature and differs from the Curie temperature by only a few degrees. The same law holds true for antiferromagnetic materials, but Θ becomes negative. For ferroelectrics as well, the relationship between dielectric constant and temperature can be written in the form shown above at temperatures higher than the Curie temperature. P. Weiss introduced the concept of molecular fields and derived this law using classical statistical mechanics. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
常磁性状態での強磁性体の磁化率 χm が絶対温度 T の関数として χm=C/(T-Θ) で表わされるという法則。この法則はキュリー温度のごく近傍以外ではよく成立する。 C はキュリー定数と呼ばれる物質定数,Θ は常磁性キュリー温度と呼ばれキュリー温度と数度違うだけである。反強磁性体でも同形の法則が成り立つが,Θ が負となる。強誘電体でも,キュリー温度よりも高い温度では誘電率と温度との関係が前述の形で書ける。 P.ワイスは分子場の概念を導入し,古典統計力学を用いてこの法則を導いた。
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