Synthesis of ferromagnetic manganese-bismuth nanoparticles using a manganese-based ligated anionic-element reagent complex (Mn-LAERC) and formation of bulk MnBi magnets therefrom

Patent metadata

Field	Value
Publication number	US-9796023-B2
Application number	US-201514593583-A
Country	US
Kind code	B2
Filing date	Jan 9, 2015
Priority date	Jan 9, 2015
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A method for synthesizing ferromagnetic manganese-bismuth (MnBi) nanoparticles, and the MnBi nanoparticles so synthesized, are provided. The method makes use of a novel reagent termed a manganese-based Anionic Element Reagent Complex (Mn-LAERC). A process for forming a bulk MnBi magnet from the synthesized MnBi nanoparticles is also provided. The process involves simultaneous application of elevated temperature and pressure to the nanoparticles.

First claim

What is claimed is:

1. A method for synthesizing MnBi nanoparticles, the method comprising:
adding cationic bismuth to a complex according to a formula,
Mn 0 .X y .L z ;

wherein Mn 0 is zero-valent manganese, X is a hydride molecule, L is a nitrile compound, y is an integral or fractional value greater than zero, and z is an integral or fractional value greater than zero;
thereby forming the MnBi nanoparticles.

2. The method as recited in claim 1 , wherein the nitrile compound is undecyl cyanide.

3. The method as recited in claim 1 , further comprising:
contacting the complex with a free surfactant.

4. The method as recited in claim 3 , wherein the adding and contacting steps are performed simultaneously.

5. The method as recited in claim 1 , wherein the cationic bismuth is present as part of a bismuth salt, the bismuth salt having an acyl anion.

6. The method as recited in claim 5 , wherein the acyl anion is neodecanoate.

7. The method as recited in claim 1 , wherein the hydride molecule is a borohydride.

8. The method as recited in claim 1 , wherein the hydride molecule is lithium borohydride.

9. A process for forming a bulk MnBi magnet, the process comprising:
applying elevated temperature and elevated pressure simultaneously to a sample of MnBi nanoparticles;
wherein the MnBi nanoparticles are synthesized by a method comprising:
adding cationic bismuth to a complex according to a formula,
Mn 0 .X y .L z ;

wherein Mn 0 is zero-valent manganese, X is a hydride molecule, L is a nitrile compound, y is an integral or fractional value greater than zero, and z is an integral or fractional value greater than zero;
thereby forming MnBi nanoparticles.

10. The process as recited in claim 9 , wherein the elevated temperature is within the range 100-200° C. and the elevated pressure is within the range 10-100 MPa.

11. The process as recited in claim 9 , wherein the elevated temperature is about 150° C., the elevated pressure is about 40 MPa, and the applying step is performed for about 6 hours.

Assignees

• Toyota Motor Eng & Mfg North America Inc
• The Univ Of Manitoba

Inventors

• Rowe Michael Paul
• Skoropata Elizabeth Marie
• Wrocyznskyj Yaroslav Stephan
• Van Lierop Johan Alexander

Classifications

• B22F1/054

  Nanosized particles · CPC title

• B22F1/00

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• C22C12/00 Primary

  Alloys based on antimony or bismuth · CPC title

• C22C1/0491

  Chemistry & Metallurgy · mapped topic

• B22F3/14

  simultaneously · CPC title