Ferromagnetic element-substituted room-temperature multiferroic material and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-11958758-B2
Application number	US-201917285473-A
Country	US
Kind code	B2
Filing date	Aug 5, 2019
Priority date	Oct 30, 2018
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Disclosed is a ferromagnetic element-substituted room-temperature multiferroic material having ferromagnetism and ferroelectricity at room temperature, wherein the ferromagnetic element-substituted room-temperature multiferroic material includes a compound of chemical formula 1: <chemical formula 1> (Pb1-xMx)Fe1/2Nb1/2O3. In chemical formula 1, M represents a ferromagnetic element, and x represents a number greater than 0 and smaller than 1.

First claim

The invention claimed is:

1. A ferromagnetic element-substituted room-temperature multiferroic material comprising a compound of the following chemical formula 1:
(Pb 1-x M x )Fe 1/2 Nb 1/2 O 3 ,  <chemical formula 1>

where M represents a ferromagnetic element, and x is from 0.1 to 0.2,
wherein the room-temperature multiferroic material:
is composed of a single phase;
has a polycrystalline bulk shape; and
has an ABO 3 perovskite structure,

wherein a material at A-site of the ABO 3 perovskite structure is substituted by the ferromagnetic element so that 180-degreee superexchange interaction changes to 90-degree interaction,
wherein the room-temperature multiferroic material has a higher saturation magnetization and a higher magnetoelectric coefficient than that of PbFe 1/2 Nb 1/2 O 3 ,
wherein the room-temperature multiferroic material has ferromagnetism and ferroelectricity.

2. The ferromagnetic element-substituted room-temperature multiferroic material of claim 1 , wherein, in chemical formula 1, M comprises iron (Fe), nickel (Ni), or cobalt (Co).

3. A method for manufacturing a ferromagnetic element-substituted room-temperature multiferroic material, the method comprising:
mixing a lead oxide, an iron oxide, a niobium oxide, and a ferromagnetic element to form a mixture;
calcinating the mixture; and
sintering the mixture to form a room-temperature multiferroic material,
wherein the ferromagnetic element-substituted room-temperature multiferroic material comprises a compound of the following chemical formula 1:
(Pb 1-x M x )Fe 1/2 Nb 1/2 O 3 ,  <chemical formula 1>

where M represents a ferromagnetic element, and x is from 0.1 to 0.2,
wherein the room-temperature multiferroic material:
is composed of a single phase;
has a polycrystalline bulk shape; and
has an ABO 3 perovskite structure,

wherein a material at A-site of the ABO 3 perovskite structure is substituted by the ferromagnetic element so that 180-degreee superexchange interaction changes to 90-degree interaction,
wherein the room-temperature multiferroic material has a higher saturation magnetization and a higher magnetoelectric coefficient than that of PbFe 1/2 Nb 1/2 O 3 ,
wherein the room-temperature multiferroic material has ferromagnetism and ferroelectricity.

4. The method of claim 3 , between the forming of the mixture and the calcinating, further comprising first ball-milling the mixture.

5. The method of claim 3 , between the calcinating of the mixture and the sintering the mixture to form a room-temperature multiferroic material, further comprising second ball-milling the mixture.

6. The method of claim 3 , before the sintering of the mixture to form a room-temperature multiferroic material, further comprising pressurizing the mixture to form pellets.

7. The method of claim 3 , wherein the calcinating is performed at a temperature in a range of 600° C. to 850° C. in a range of 1 hour to 6 hours.

8. The method of claim 3 , wherein the sintering to form a room-temperature multiferroic material is performed at a temperature in a range of 950° C. to 1150° C. in a range of 1 hour to 16 hours.

9. The method of claim 3 , wherein the calcinating and the sintering to form a room-temperature multiferroic material are performed in air or at an inert atmosphere.

10. The method of claim 3 , wherein the lead oxide comprises PbO, the iron oxide comprises Fe 2 O 3 , and the niobium oxide comprises Nb 2 O 5 .

11. The method of claim 3 , wherein the ferromagnetic element comprises at least one of iron, nickel, and cobalt.

12. The method of claim 3 , wherein the ferromagnetic element is composed of at least one of Fe 2 O 3 , NiO, and CoCO 3 .

Assignees

• Ulsan Nat Inst Science & Tech Unist

Inventors

• Jo Wook
• Cho Jae Hyeon

Classifications

• C01G53/82

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01G51/82

  Compounds containing cobalt, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01G49/009 Primary

  Compounds containing iron, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01G51/006

  Chemistry & Metallurgy · mapped topic

• C01G53/006

  Chemistry & Metallurgy · mapped topic