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Magnetocaloric effect in La(Fe _xSi _(1-x)) 13 ferromagnets

机译:La(Fe _xSi _(1-x))13铁磁体中的磁热效应

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摘要

The isothermal changes in the magnetic entropy and the lattice entropy and the adiabatic temperature change in La(Fe _(0.88)Si _(0.12)) _(13) and La(Fe _(0.86)Si _(0.14)) _(13) ferromagnets in a magnetic field are calculated. The calculations are performed with a generalized magnetostriction model of a ferromagnet; the calculation results are compared to experimental data. It is shown that the change in the lattice entropy decreases the magnetocaloric effect and makes it possible to explain the experimental data obtained for La(Fe _xSi _(1-x)) 13 (x = 0.86, 0.88) ferromagnets. The temperature dependences of the bulk compression moduli of these ferromagnets are calculated, and these dependences indicate a strong lattice softening in the vicinity of the magnetic phase transition in them. The thermal expansion coefficient and some magnetic properties of the ferromagnet with x = 0.86 are measured to determine the numerical values of the parameters entering into calculation formulas.
机译:La(Fe _(0.88)Si _(0.12))_(13)和La(Fe _(0.86)Si _(0.14))的磁熵和晶格熵的等温变化以及绝热温度变化13)计算磁场中的铁磁体。用铁磁体的广义磁致伸缩模型进行计算。计算结果与实验数据进行比较。结果表明,晶格熵的变化降低了磁热效应,并可以解释从La(Fe _xSi _(1-x))13(x = 0.86,0.88)铁磁体获得的实验数据。计算了这些铁磁体的体压缩模量的温度依赖性,并且这些依赖性指示了它们中的磁性相变附近的强晶格软化。测量x = 0.86的铁磁体的热膨胀系数和某些磁性能,以确定输入计算公式的参数的数值。

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