Table-like shape magnetocaloric effect and large refrigerant capacity in dual-phase HoNi/HoNi2 compo

• 作 者: Dan Guo Yikun Zhang Yaming Wang Jiang Wang Zhongming Ren
• 机 构: State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurg
• 出 处: 中国物理B（英文版）
• 发表日期: 2020年10期
• 关键词: HoNi–HoNi2 composite magnetic refrigeration table-like magnetocaloric effect

Nowadays, magnetic cooling (MC) technology by using the magnetocaloric effect (MCE) has attracted extensive research interest for its promising practical applications. A constant large/giant MCE covers wide refrigeration temperatures (denote as table-like shape) is beneficial for obtaining high efficiency performance for MC. In this paper, the HoNi/HoNi2 composite was successfully synthesized by arc-melting method and proved to be composed of HoNi and HoNi2 crystalline phases with weight ratios of 52.4 wt.％ and 47.6 wt.％, respectively. The maximum magnetic entropy change (-?SmaxM ) is 18.23 J/(kg·K), and the refrigerant capacity values RC1, RC2, and RC3 are 867.9 J/kg, 676.4 J/kg, and 467.8 J/kg with?H = 0–70 kOe, respectively. The table-like shape MCE and large refrigerant capacity values make the composite attractive for cryogenic MC using the Ericsson cycle.