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Reversible piezomagnetic effect material with giant magnetocaloric heat and preparation method and application thereof

A technology of piezoelectric effect and thermal effect, which can be used in magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., and can solve problems such as magnetic reduction.

Active Publication Date: 2019-03-22
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the sample magnetism will decrease abruptly due to the change of the direction of the ferromagnetic helical axis

Method used

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  • Reversible piezomagnetic effect material with giant magnetocaloric heat and preparation method and application thereof
  • Reversible piezomagnetic effect material with giant magnetocaloric heat and preparation method and application thereof
  • Reversible piezomagnetic effect material with giant magnetocaloric heat and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The composition of the material is: Mn 1-x Fe x NiGe (x=0.09, 0.11, 0.13, 0.16, 0.18)

[0048] 1) According to the chemical formula Mn 1-x Fe x NiGe (x is 0.09, 0.11, 0.13, 0.16, 0.18) Weigh samples and ingredients.

[0049] 2) Put the raw materials prepared in step 1) into the electric arc furnace respectively, and vacuumize to 3×10 -3 Pa or above, after cleaning twice with the usual high-purity argon (purity 99.996wt%) cleaning method, under the protection of 1 atmospheric pressure of high-purity argon (purity 99.996wt%), the arc is started and the melting is repeated 3 times. The melting temperature is 2000°C. After the smelting is finished, it is cooled in a copper crucible to obtain a cast alloy ingot.

[0050] 3) Wrap the alloy ingots prepared in step 2) with metal molybdenum sheets respectively, and seal them in a vacuum quartz tube (vacuum degree is 1×10 -4 Pa), after annealing at 850°C for 6 days, break the quartz tube after the furnace is cooled to room...

Embodiment 2

[0052] Prepare the magnetic material sample according to the same method as in Example 1, the difference is that the chemical formula Mn 1- x Fe x x=0.15 in NiGe.

[0053] Performance Characterization

[0054] 1. Characterization of crystal structure

[0055] The crystal structures of the samples of Example 1 and Example 2 were determined by a temperature-variable X-ray diffractometer. The analysis found that all the samples had formed a phase, and above the Martensitic transformation temperature were all Ni 2 In-type hexagonal structure, TiNiSi-type orthorhombic structure below the Martensitic transformation temperature.

[0056] typically, Figure 7 , Figure 8 gives Mn 0.91 Fe 0.9 X-ray diffraction (XRD) patterns of NiGe (x=0.09) samples at 50K and 400K. The refinement results show that the sample is a typical TiNiSi type orthorhombic structure below the Martensitic transformation temperature, and Ni is above the Martensitic transformation temperature. 2 In typ...

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Abstract

The invention provides a reversible piezomagnetic effect material with giant magnetocaloric heat and a preparation method and application thereof. The chemical formula of the reversible piezomagneticeffect material is Mn1-xFexNiGe, wherein x is greater than or equal to 0.09 and smaller than or equal to 0.18. The reversible piezomagnetic effect material exhibits a reversible piezomagnetic effect in a temperature region of magnetic phase transition. The reversible piezomagnetic effect material in low temperature orthogonal phase exhibits the magnetic phase transition caused by a change of a ferromagnetic screw shaft. The magnetic properties of the material are significantly enhanced under pressure, and exhibit a pressure-induced and magnetization-increased piezomagnetic effect in the low temperature region. The pressure is removed after reaching 1.04 GPa and the magnetic properties are restored to the state before pressurization. In the magnetic field range below 0.1 T, the piezomagnetic effect of magnetic field regulation is achieved by the adjustment of the direction of the ferromagnetic screw shaft through the applied magnetic field. Under the environment with magnetic field above 0.5 T, the piezomagnetic effect disappears to contribute for achieving the piezomagnetic effect of the external magnetic field regulation. The reversible piezomagnetic effect material can be used inmagnetic refrigeration, pressure sensors, automatic detection and metrology, and testing and automatic controlling equipment.

Description

technical field [0001] The invention relates to a reversible piezoelectric magnetic effect material with giant magnetocaloric effect, a preparation method and application thereof. Background technique [0002] The traditional piezomagnetic effect refers to the phenomenon that when an object is subjected to mechanical force, strain is generated inside it, thereby generating stress and causing a change in magnetic permeability. The piezomagnetic coefficient is used to measure the magnitude of the magnetic change caused by the piezomagnetic effect. [0003] Piezomagnetic sensor (also known as magnetoelastic sensor) is a new type of sensor emerging at home and abroad in recent years. Its working principle is based on the piezomagnetic effect. This sensor is used to transform the force into the change of the sensor's magnetic permeability, and output a correspondingly changed electrical signal through the change of the magnetic permeability. Compared with traditional piezoelect...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/16C22F1/02H01F1/047H01F41/02
CPCC22C1/02C22C28/00C22C30/00C22C2202/02C22F1/002C22F1/02C22F1/16H01F1/047H01F41/0253
Inventor 梁飞翔沈斐然胡凤霞王晶孙继荣沈保根
Owner INST OF PHYSICS - CHINESE ACAD OF SCI