Multicaloric MnNiSi alloys

Patent metadata

Field	Value
Publication number	US-11142812-B2
Application number	US-201514801836-A
Country	US
Kind code	B2
Filing date	Jul 17, 2015
Priority date	Jul 18, 2014
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

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 consisting of:
a first compound, said first compound comprising Mn 1±α Ni 1±β Si 1±γ , wherein α≤0.25, γ≤0.25, and γ≤0.25;
a second compound, said second compound isostructurally substituting the first compound, and said second compound comprising one of Fe 1±λ Mn 1±μ Ge 1±ν wherein λ≤0.25, μ≤0.25, and ν≤0.25 and Co 1±λ Fe 1±μ Ge 1±ν wherein λ≤0.25, μ≤0.25, and ν≤0.25;
where the ratio of the first compound to the second compound is 1-x to x; and
where when the second compound comprises Co 1±λ Fe 1±μ Ge 1±ν then x is from 0.30 to 0.50, and when the second compound is Fe 1±λ Mn 1±μ Ge 1±ν then x is from 0.40 to 0.65.

2. An alloy consisting of:
a first compound, said first compound comprising Mn 1±α Ni 1±β Si 1±γ , wherein α≤0.25, β≤0.25, and γ≤0.25;
a second compound, said second compound isostructurally substituting the first compound, and said second compound comprising one of Fe 1±λ Mn 1±μ Ge 1±ν wherein λ≤0.25, μ≤0.25, and ν≤0.25 and Co 1±λ Fe 1±μ Ge 1±ν wherein λ≤0.25, μ≤0.25, and ν≤0.25;
where the ratio of the first compound to the second compound is 1-x to x; and

where when the second compound comprises Co 1±λ Fe 1±μ Ge 1±ν then x is from 0.30 to 0.50, and when the second compound is Fe 1±λ Mn 1±μ Ge 1±ν then x is from 0.40 to 0.65 and further comprising an element from the group consisting of B, C, N, P, S, As and H, 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.

3. An alloy consisting of
a first compound, said first compound comprising Mn 1±α Ni 1±β Si 1±γ , wherein α≤0.25, β≤0.25, and γ≤0.25; and
a second compound, said second compound isostructurally substituting the first compound, and said second compound comprising Fe 1±λ Mn 1±μ Ge 1±ν , wherein λ≤0.25, μ≤0.25, and ν≤0.25.

4. An alloy consisting of
a first compound, said first compound comprising Mn 1±α Ni 1±β Si 1±γ , wherein α≤0.25, β≤0.25, and γ≤0.25; and
a second compound, said second compound isostructurally substituting the first compound, and said second compound comprising Fe 1±λ Mn 1±μ Ge 1±ν , wherein λ≤0.25, μ≤0.25, and ν≤0.25 and further comprising an element from the group consisting of B, C, N, P, S, As and H, 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.

5. An alloy consisting of
a first compound, said first compound comprising Mn 1±α Ni 1±β Si 1±γ , wherein α≤0.25, β≤0.25, and γ≤0.25; and
a second compound, said second compound isostructurally substituting the first compound, and said second compound comprising Co 1±λ Fe 1±μ Ge 1±ν wherein λ≤0.25, μ≤0.25, and ν≤0.25.

6. An alloy consisting of
a first compound, said first compound comprising Mn 1±α Ni 1±β Si 1±γ , wherein α≤0.25, β≤0.25, and γ≤0.25; and
a second compound, said second compound isostructurally substituting the first compound, and said second compound comprising Co 1±α Fe 1±μ Ge 1±ν wherein λ≤0.25, μ≤0.25, and ν≤0.25 and further comprising an element from the group consisting of B, C, N, P, S, As and H, 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.

Assignees

• Univ Louisiana State
• Board Of Trustees Of Southern Illinois Univ

Inventors

• Samanta Tapas
• Stadler Shane
• Ali Naushad

Classifications

• H01F1/015

  Metals or alloys · CPC title

• C22C19/005

  with Manganese as the next major constituent · 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

• C22C19/03

  based on nickel · CPC title