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A kind of mncoge-based magnetic material with giant barocaloric effect and its preparation method and application

A technology of magnetic materials and thermal effects, applied in magnetic materials, magnetic objects, thermoelectric devices, etc., can solve the problems of limited pressure heating effect, total entropy change (phase transition latent heat, etc.), and achieve the effect of reducing production cost and reducing dependence.

Active Publication Date: 2017-06-06
INST OF PHYSICS - CHINESE ACAD OF SCI
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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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  • A kind of mncoge-based magnetic material with giant barocaloric effect and its preparation method and application
  • A kind of mncoge-based magnetic material with giant barocaloric effect and its preparation method and application
  • A kind of mncoge-based magnetic material with giant barocaloric effect and its preparation method and application

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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 days, the qu...

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Abstract

The invention provides a MnCoGe-based magnetic material with giant pressure thermal effect and its preparation method and use. The general chemical formula of this magnetic material is: MnCoGe1‑xInx, where 0<x≤0.03, and it has a Ni2In type hexagonal structure. The material has the characteristics of coupling the Martens structure phase transition and the magnetic phase transition, and the coupling occurs near room temperature. The material exhibits a reverse pressure heating effect under pressure, and the entropy change amplitude near room temperature under the pressure of 3kbar is at least 50Jkg‑1K‑1. As the In content changes, the magnetic structure coupling temperature Tmstru of the material is adjustable in a wide temperature range near room temperature, so that the giant pressure heating effect appears in a wide temperature range near room temperature. The preparation method of the magnetic material is simple, the raw materials are green and environmentally friendly, and it has the advantages of high efficiency and energy saving.

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 Patents(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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