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

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...

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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.

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