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MnCoGe-based magnetic material with giant piezocaloric effect as well as preparation method and application thereof

A magnetic material and thermal effect technology, which is applied in the direction of magnetic materials, magnetic objects, thermoelectric devices, etc., can solve the problems of total entropy change (high latent heat of phase change, limited pressure-caloric effect, etc.), and achieve the effect of reducing preparation cost and reducing dependence

Active Publication Date: 2015-09-30
INST OF PHYSICS - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

Although the new giant magnetocaloric materials all exhibit the characteristics that the magnetic phase transition occurs simultaneously with the phase transition of the crystal structure, the total entropy change (latent heat of phase transition) of the phase transition process is not high enough (not easy to exceed 30.0Jkg -1 K -1 ), the obtained autoclaving effect is limited

Method used

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  • MnCoGe-based magnetic material with giant piezocaloric effect as well as preparation method and application thereof
  • MnCoGe-based magnetic material with giant piezocaloric effect as well as preparation method and application thereof
  • MnCoGe-based magnetic material with giant piezocaloric effect as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment

[0052] Example: Preparation of MnCoGe 1-x In x (x=0.005, 0.01, 0.015, 0.02, 0.025 or 0.03) magnetic material

[0053] 1) According to the chemical formula MnCoGe 1-x In x (x is 0.005, 0.01, 0.015, 0.02, 0.025 and 0.03 respectively) Weigh the samples and ingredients.

[0054] 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 1 or 2 times 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 for 3 Second, the melting temperature is 2000°C. After the smelting is finished, it is cooled in a copper crucible to obtain a cast alloy ingot.

[0055] 3) Wrap the alloy ingots prepared in step 2) with metal molybdenum sheets, and seal them in a vacuum quartz tube (the vacuum degree is 1×10 -4 Pa), after annealing at 875 °C for 6 day...

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Abstract

The invention provides a MnCoGe-based magnetic material with a giant piezocaloric effect as well as a preparation method and application thereof. A chemical general formula of the MnCoGe-based magnetic material is MnCoGe1-xInx, wherein x is more than 0 and less than or equal to 0.03, and the MnCoGe-based magnetic material has a Ni2In type hexagonal structure. The MnCoGe-based magnetic material has the characteristic that martensitic structural phase transition and magnetic phase transition are coupled, and coupling is carried out at the temperature close to room temperature. The MnCoGe-based magnetic material shows an adverse piezocaloric effect under the action of pressure, the amplitude of entropy change under the action of pressure of 3kbar and at the temperature close to room temperature is at least 50J / (Kg.K). Along with change of In content, the magnetic structure coupling temperature Tmstru of the material is adjustable at a wide temperature region close to room temperature, so that the giant piezocaloric effect appears in the wide temperature region close to room temperature. The MnCoGe-based magnetic material has the advantages of simple preparation method, green and environmental-friendly raw materials, high efficiency and energy conservation.

Description

technical field [0001] The invention relates to a magnetic functional material, in particular to Ni with giant pressure heat effect 2 In-type hexagonal MnCoGe 1-x In x Magnetic material and its preparation method and material use. Background technique [0002] The energy consumption of the refrigeration industry in today's society accounts for more than 15% of the total energy consumption of the society. The Carnot cycle efficiency of the commonly used gas compression refrigeration technology is only about 25%, and the gas refrigerant used in gas compression refrigeration will destroy the ozone layer of the atmosphere and cause the greenhouse effect. Therefore, searching for non-polluting, green and environmentally friendly refrigeration materials and developing new low-energy, high-efficiency refrigeration technologies are problems that need to be solved urgently in today's world. [0003] Solid-state refrigeration technology is a green and environmentally friendly refr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02H01F1/047H01L37/00H10N15/00
Inventor 包立夫胡凤霞王晶武荣荣刘瑶赵莹莹章明孙继荣沈保根
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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