MULTICALORIC MnNiSi ALLOYS

Patent metadata

Field	Value
Publication number	US-2016017462-A1
Application number	US-201514801836-A
Country	US
Kind code	A1
Filing date	Jul 17, 2015
Priority date	Jul 18, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

A multicaloric alloy material combines two isostructural compounds, the first compound being MnNiSi and the second compound being either MnFeGe or CoFeGe, each such compound having extremely different magnetic and thermo-structural properties. The resulting alloy material (MnNiSi) 1-x (MnFeGe) x or (MnNiSi) 1-x (CoFeGe) x possesses extraordinary magnetocaloric and/or barocaloric properties with an acute sensitivity to applied pressure and no appreciable magnetic hysteresis losses.

First claim

What is claimed is:

1 . An alloy comprising
a first isostructural compound, said first isostructural compound comprising Mn, Ni and Si; and a second isostructural compound, said second isostructural compound comprising Fe, Ge and one element from the group consisting of Mn and Co.

2 . The alloy according to claim 1 , the proportion of the first isostructural compound and the second isostructural compound be given by the formula:
A 1-x B x , where A is the first isostructural compound, B is the second isostructural compound, and x is between 0.30 and 0.50.

3 . The alloy according to claim 2 , the second isostructural compound comprising Fe, Ge and Mn.

4 . The alloy according to claim 3 , x being 0.40 to 0.65.

5 . The alloy according to claim 4 , atomic percentages of Mn, Ni and Si in the first isostructural compound being about equal.

6 . The alloy according to claim 5 , the first isostructural compound comprising Mn 1±α Ni 1±β Si 1±γ , wherein α≦0.25, β≦0.25, and γ≦0.25.

7 . The alloy according to claim 5 , the atomic percentages of Fe, Ge and Mn in the second isostructural compound being about equal.

8 . The alloy according to claim 7 , the second isostructural compound comprising Fe 1±λ Mn 1±μ Ge 1±ν , wherein λ≦0.25, μ≦0.25, and ν≦0.25.

9 . The alloy according to claim 4 , further comprising an element from the group consisting of B, C, N, P, S, As and H.

10 . The alloy according to claim 9 , the element from the group consisting of B, C, N, P, S, As and H comprising not more than 15% by mass of the alloy.

11 . The alloy according to claim 2 , the second isostructural compound comprising Fe, Ge and Co.

12 . The alloy according to claim 11 , x being 0.30 to 0.50.

13 . The alloy according to claim 12 , atomic percentages of Fe, Ge and Co in the second isostructural compound being about equal.

14 . The alloy according to claim 13 , the second isostructural compound comprising Co 1±λ Fe 1±μ Ge 1±ν , wherein λ≦0.25, μ≦0.25, and ν≦0.25.

15 . The alloy according to claim 14 , further comprising an element from the group consisting of B, C, N, P, S, As and H.

16 . The alloy according to claim 15 , the element from the group consisting of B, C, N, P, S, As and H comprising not more than 15% by mass of the alloy.

17 . A multicaloric alloy comprising
a first isostructural compound, said first isostructural compound comprising Mn, Ni and Si; and a second isostructural compound, said second isostructural compound having a stable hexagonal Ni 2 In-type structure and a Curie Temperature less than 400K.

18 . The multicaloric alloy of claim 17 , the second isostructural compound comprising Fe, Ge and one element from the group consisting of Mn and Co.

19 . The multicaloric alloy of claim 18 , the first isostructural compound comprising Mn 1±α Ni 1±β Si 1±γ , wherein α≦0.25, β≦0.25, and γ≦0.25; and
the second isostructural compound comprising Fe 1±λ Mn 1±μ Ge 1±ν , wherein λ≦0.25, μ≦0.25, and ν≦0.25.

20 . The multicaloric alloy of claim 18 , the first isostructural compound comprising Mn 1±α Ni 1±β Si 1±γ , wherein α≦0.25, β≦0.25, and γ≦0.25; and
the second isostructural compound comprising Co 1±λ Fe 1±μ Ge 1±ν , wherein λ≦0.25, μ≦0.25, and ν≦0.25.

Assignees

• Univ Louisiana State
• Univ Southern Illinois

Inventors

• Samanta Tapas
• Stadler Shane
• Ali Naushad

Classifications

• H01F1/015

  Metals or alloys · CPC title

• C22C22/00

  Alloys based on manganese · CPC title

• C22C30/00 Primary

  Alloys containing less than 50% by weight of each constituent · CPC title

• C22C19/005

  with Manganese as the next major constituent · CPC title

• C22C19/03

  based on nickel · CPC title