Orientation-dependent Magneto-Clapeyron Equation
Orientation-dependent Magneto-Clapeyron Equation
复制标题
方向相关的磁克拉佩龙方程
DOI：
10.1143/jjap.40.6818
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发表时间：
2001
影响因子：
1.5
通讯作者：
Tsunehisa Kimura
中科院分区：
文献类型：
--
作者：
Tsunehisa Kimura
在简单推广克拉珀龙方程的基础上，研究了外加磁场对各向异性抗磁材料（包括晶体和液晶）相变温度的影响。转变温度表示为相对于所施加的场的材料的取向的函数。对反式偶氮苯晶体和超拉伸聚乙烯纤维熔点的计算表明，由于取向引起的熔点偏移在10 ~（-5）~ 10 ~（-4）K之间。在液晶系统中的各向异性-各向同性转变的情况下，预计会有较大的位移（Δ 10-3 K），其中它们的转变焓比固-液转变小一到两个数量级。
Effects of an applied magnetic field on the phase transition temperature of anisotropic diamagnetic materials including crystals and liquid crystals were studied on the basis of a simple extension of the Clapeyron equation. The transition temperature was expressed as a function of the orientation of the material with respect to the applied field. Calculations for the melting points of the trans azobenzene crystal and a superdrawn polyethylene fiber showed that the shift of the melting point due to the orientation was of the order of 10-5–10-4 K. Larger shifts (∼ 10-3 K) were expected in the case of anisotropic-isotropic transitions in liquid crystal systems where their transition enthalpy is smaller by one to two orders than that for solid-liquid transitions.