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A Mnnige-based magnetic phase change alloy with low thermal hysteresis

A technology of magnetic phase transformation and alloying, applied in the field of magnetic phase transformation alloy MnNiGe, which can solve the problems of large thermal hysteresis and reversible accompanying effects of unfavorable alloy phase transformation.

Active Publication Date: 2020-06-26
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Large thermal hysteresis is not conducive to the reversible occurrence of alloy phase transformation accompanying effects

Method used

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  • A Mnnige-based magnetic phase change alloy with low thermal hysteresis
  • A Mnnige-based magnetic phase change alloy with low thermal hysteresis
  • A Mnnige-based magnetic phase change alloy with low thermal hysteresis

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Embodiment

[0015] The phase structure of the alloy was characterized by X-ray Diffraction (XRD). figure 1 Yes (MnNiGe) 1-x (Fe 2 Ge) x Alloy ( 0.02≤ x ≤ 0.16 ) room temperature XRD diffraction data, with x With the increase of , the room temperature structure of the system gradually changes from high temperature hexagonal Ni 2 The In-type structure transforms into a low-temperature orthorhombic TiNiSi-type structure, which suggests that the Fe 2 The introduction of Ge lowers the structural phase transition temperature of the alloy.

[0016] Measured by Physical Property Measurement System (PPMS) (MnNiGe) 1-x (Fe 2 Ge) x Alloy ( 0.02≤ x ≤ 0.16 ) isothermal magnetization curves and temperature-dependent magnetization. figure 2 It is under 5 T field (MnNiGe) 1-x (Fe 2 Ge) x Alloy ( 0.02≤ x ≤ 0.16 ) magnetization versus temperature. x = 0.02 A magnetization jump occurs in the sample near 380 K, and the corresponding heating and cooling curves do not overlap, which indicat...

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Abstract

The invention discloses low-heat-stagnation MnNiGe-based magnetic phase transition alloy. The atomic expression of the magnetic phase transition alloy is Mn0.9Ni0.9Fe0.2Ge, and the heat stagnation ofalloy hexagon-orthorhombic structure phase transition is 5.3 K. High-purity metal elements Ni, Mn, Fe and Ge serve as raw materials of the magnetic phase transition alloy, all the alloy elements are matched precisely according to the alloy expression, preparation is conducted through an electric arc smelting method, and smelting is conducted under protection of high-purity argon atmosphere. The smelted alloy is annealed for 120 hours at 800 DEG C, and then quenching is conducted in cold water. The heat stagnation of the alloy hexagon-orthorhombic structure phase transition is the lowest in similar alloy, namely the system structure phase transition temperature is lowest to the existing minimum level.

Description

technical field [0001] The invention relates to a low thermal hysteresis magnetic phase change alloy MnNiGe, which belongs to the field of phase change alloy preparation. Background technique [0002] MnMX (M=Co, Ni; X=Ge, Si) alloys generally exhibit a temperature-induced structural phase transition between the hexagonal parent phase and the orthorhombic martensitic phase. The thermal hysteresis that accompanies this phase transition is usually large, typically above 20 K. Larger thermal hysteresis is not conducive to the reversible occurrence of accompanying effects of alloy phase transformation. Currently, the lowest thermal hysteresis reported for this system is 7 K. The value is determined by the Institute of Physics, Chinese Academy of Sciences Mn 1-x Fe x Found in NiGe (x=0.11 and 0.18) alloys. in Mn 1-x Fe x In NiGe alloys, Fe replaces Mn atoms. Contents of the invention [0003] The purpose of the present invention is to provide a low thermal hysteresis ma...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/16H01F1/01
CPCC22C1/02C22C28/00C22C30/00C22C2202/02C22F1/002C22F1/16H01F1/01
Inventor 龚元元王经纬徐锋刘俊
Owner NANJING UNIV OF SCI & TECH
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