Abstract

The magnetization of a fast-hardened ribbon Ni₅₀Mn₃₅Al₂Sn₁₃ sample has been studied and its magnetocaloric effect (MCE) has been directly measured in the temperature range 100–350 K. The MCE has been investigated in a cyclic magnetic field of 1.8 T strength at a frequency of 0.2 Hz. The value of the inverse effect near the temperature of the magnetostructural phase transition (MSPT) has been shown to depend on the rate of temperature scanning. The higher the scanning rate, the greater the MCE value due to the kinetic relaxation effect in the martensitic phase and the irreversibility of the phase transition in the magnetic fields used. The value of the inverse effect when the magnetic field is turned on once is –0.39 K in the field of 18 kOe, and the value of the direct effect is 0.2 K. The significant magnetization increase observed near the Т_С in a weak magnetic field (100 Oe) has been attributed to both the Hopkinson effect and the coexistence of two crystalline phases (austenite–martensite).

中文翻译：

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Ni50Mn35Al2Sn13 Heusler 合金带样品中的正向和反向磁热效应

摘要

快速硬化带 Ni ₅₀ Mn ₃₅ Al ₂ Sn _{13的磁化强度}对样品进行了研究，并在 100-350 K 的温度范围内直接测量了其磁热效应 (MCE)。已在频率为 0.2 Hz、强度为 1.8 T 的循环磁场中研究了 MCE。已显示在磁结构相变 (MSPT) 温度附近的逆效应值取决于温度扫描速率。扫描速率越高，由于马氏体相中的动力学弛豫效应和所用磁场中相变的不可逆性，MCE 值越大。在 18 kOe 的磁场中，开启一次磁场时的反向效应值为 –0.39 K，直接效应值为 0.2 K。在Т _{С附近观察到显着的磁化强度增加}在弱磁场（100 Oe）中，Hopkinson 效应和两个晶相（奥氏体-马氏体）的共存。