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A bi-substituted mn-deficient mn 2 Sb-based alloy and its preparation method and application

A kind of base alloy and alloy technology, which is applied in the Mn-deficient Mn2Sb base alloy substituted by Bi and its preparation field, can solve the problems that the first-level magnetoelastic phase change material cannot be obtained and the replacement cannot be realized, and the preparation method is simple and convenient, and the energy The effect of less consumption and cost reduction

Active Publication Date: 2021-10-08
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Prior art Mn 2 Most of the methods to achieve the first-order magnetoelastic phase transition in Sb alloys are replaced by simple elements, and the research found that if only the diamagnetic main group element Bi is used to replace Mn 2 If Sb in the Sb alloy is replaced, neither the substitution nor the first-order magnetoelastic phase change material can be obtained; 2 Other methods for the magnetoelastic phase transition of Sb alloys are very important and necessary; on this basis, the present invention creatively starts from the perspective of transition element vacancy, regulates and realizes the first-order magnetic phase transition through Mn vacancy , exploring the appropriate amount of Mn vacancy in this process is the key and difficult problem for the alloy to achieve the first-order magnetic phase transition, so there is no information about Mn in the prior art 2 It is reported that the Sb alloy realizes the first-order magnetoelastic phase transition through the regulation of the vacancy of transition elements. On the basis of finding the appropriate amount of Mn vacancy, Sb is replaced by the diamagnetic main group element Bi, thus realizing the Mn 2 Severe first-order magnetoelastic phase transition is obtained in Sb alloy, showing a huge sudden change in magnetization before and after the phase transition, and then studying the physical properties of the alloy such as magneto-caloric, magnetoresistance, magneto-induced strain and thermal expansion.

Method used

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  • A bi-substituted mn-deficient mn  <sub>2</sub> Sb-based alloy and its preparation method and application
  • A bi-substituted mn-deficient mn  <sub>2</sub> Sb-based alloy and its preparation method and application
  • A bi-substituted mn-deficient mn  <sub>2</sub> Sb-based alloy and its preparation method and application

Examples

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Embodiment 1

[0044] A Bi-substituted Mn-deficient Mn 2 The preparation method of Sb-based alloy, comprises the steps:

[0045] This embodiment has an alloy with a first-order magnetoelastic phase transition, and its chemical formula is Mn 2-y Sb 1-x Bi x , both x and y take 0.03.

[0046] Calculate the mass of the required Mn, Sb, and Bi elemental elements according to the ratio of the amount of the substance for batching. The accuracy is 0.1mg-0.01mg. The purity of the metal elements is above 99.99%. To compensate for the loss caused by Mn volatilization during the smelting process;

[0047] Put the prepared raw materials into the water-cooled copper crucible electric arc furnace, and pump the vacuum to 10 -3 Below Pa, fill in argon gas with a purity of 99.999% at 1 atmosphere, and carry out arc melting. During the first smelting, use a current of 25A to melt the metal until the molten metal in the crucible flows. Turn over the sample, increase the current to 35A and melt 4 times to...

Embodiment 2

[0050] This embodiment has an alloy with a first-order magnetoelastic phase transition, and its chemical formula is Mn 2-y Sb 1-x Bi x , x is 0.03, and y is 0.06. The specific preparation method is the same as that of Example 1, except that the ingot annealing temperature is 1000°C and the annealing time is 200h. Adopt the measurement process of embodiment 1, in Mn 1.94 Sb 0.93 Bi 0.03 A clear first-order magnetoelastic phase transition was also observed in the samples.

Embodiment 3

[0052] This embodiment has an alloy with a first-order magnetoelastic phase transition, and its chemical formula is Mn 2-y Sb 1-x Bi x , x takes 0.07, and y takes 0.1, and the specific preparation method is the same as the preparation process of Example 1, the difference is that Mn 1.9 Sb 0.93 Bi 0.07 The stoichiometric ratio is used to calculate the mass of the required Mn, Sb, and Bi elements for batching. The ingot annealing temperature is 900°C, and the annealing time is 180h. Using the measurement process of Example 1, in Mn 1.9 Sb 0.93 Bi 0.07 A clear first-order magnetoelastic phase transition was observed in the samples.

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Abstract

The present invention involves the technology field of magnetic phase transformation materials, and the invention has disclosed an MN absent -position MN replaced by BI 2 SB consequences and their preparation methods and applications, MN replaced by BI 2 The chemical formula of the SB conformity is: mn 2‑y SB 1‑x BI x Among them, Y is the absence of MN atoms, X represents the replacement amount of BI on SB, 0 <y <1, 0 <x ≤0.4;Then use the method of doping or element replacement to prepare the MN default MN replaced by BI 2 SB conformity alloy, regulates the first -level magnetic phase change and obtains a rich magnetic function in the alloy. 2 The SB consecutive is widely used in multiple fields such as magnetic refrigeration, magnetic storage, magnetic sensing, energy capture and energy exchange, and the preparation methods are simple and convenient, less energy consumption, low preparation costs, and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of magnetic phase change materials, in particular to a Bi-substituted Mn-deficient Mn 2 Sb-based alloy and its preparation method and application. Background technique [0002] In recent years, the multifunctional properties caused by the abundant physical behaviors near the transformation point of the first-order magnetic phase transition Mn-based alloys are becoming a hot spot and focus in the fields of applied and basic research. However, compared with Ni-Mn-based shape memory alloys with magnetic structural phase transitions, a class of magnetoelastic phase change alloys Mn with low cost and no easy-to-oxidize rare earth elements 2 Sb-based alloys have attracted extensive attention. [0003] for Mn 2 For Sb alloys, there is no first-order phase transformation in the positive 2:1 alloy. Numerous studies have found that positively divided Mn 2 The magnetic structure of Sb alloy is that two different M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C12/00C22C1/02C22F1/16C22F1/02H01F1/03
CPCC22C1/02C22C12/00C22F1/002C22F1/02C22F1/16H01F1/0306
Inventor 马胜灿张智硕罗小华张玉希曾海余广
Owner JIANGXI UNIV OF SCI & TECH
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