Thermoelectric material

Patent metadata

Field	Value
Publication number	US-11362253-B1
Application number	US-201816144241-A
Country	US
Kind code	B1
Filing date	Sep 27, 2018
Priority date	Sep 29, 2017
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

An apparatus for solid state energy harvesting includes a complex oxide based pyrochlores having a chemical formula of A2 B2 O7 configured to directly convert heat into electricity and operate and function at a higher temperature without oxidizing in air. The complex oxide based pyrochlores are mixed with cation at B-site.

First claim

The invention claimed is:

1. An apparatus for solid state energy harvesting, comprising:
a complex oxide based pyrochlores having a chemical formula of A2 B2 O7 configured to directly convert heat into electricity and operate and function at a higher temperature without oxidizing in air, wherein
A2 represents 2 atoms of gadolinium and B2 represents 1 atom of ruthenium and 1 atom of vanadium, and
the complex oxide based pyrochlores are mixed with cation at B-site.

2. The apparatus of claim 1 , wherein the B-site comprises B 3+ and B ˜5+ , allowing the complex oxide based pyrochlores to be used in a gas turbine engine.

3. The apparatus of claim 1 , wherein the complex oxide based pyrochlores range from insulating to semi-conducting material.

4. The apparatus of claim 3 , wherein the complex oxide based pyrochlores has semiconducting behavior with a fraction of an electron volt to facilitate electric power conversion.

5. The apparatus of claim 1 , wherein the complex oxide based pyrochlores comprise a Seebeck coefficient at approximately 100 micro-volt per degree temperature Kelvin.

6. The apparatus of claim 1 , wherein the complex oxide based pyrochlores comprise an electrical resistivity of approximately 10 −2 Ohm*cm.

7. The apparatus of claim 1 , wherein the complex oxide based pyrochlores comprise a thermal conductivity of approximately 10 W/m*K.

8. The apparatus of claim 1 , wherein the complex oxide based pyrochlores comprise an electronic band gap greater than zero without oxidizing at high temperatures of 500 to 800 K in the air.

9. An apparatus for solid state energy harvesting, comprising:
a complex oxide based pyrochlores having a chemical formula of A2 B2 O7 configured to directly convert heat into electricity and operate and function at a higher temperature without oxidizing in air, wherein
A2 represents 2 atoms of gadolinium and B2 represents 1 atom of ruthenium and 1 atom of vanadium, and
the complex oxide based pyrochlores are mixed with cation at B-site, the B-site comprising B 3+ and B ˜5+ , allowing the complex oxide based pyrochlores to be used in a gas turbine engine.

10. The apparatus of claim 9 , wherein the complex oxide based pyrochlores range from insulating to semi-conducting material.

11. The apparatus of claim 10 , wherein the complex oxide based pyrochlores has semiconducting behavior with a fraction of an electron volt to facilitate electric power conversion.

12. The apparatus of claim 9 , wherein the complex oxide based pyrochlores comprise a Seebeck coefficient at approximately 100 micro-volt per degree temperature Kelvin.

13. The apparatus of claim 9 , wherein the complex oxide based pyrochlores comprise an electrical resistivity of approximately 10 −2 Ohm*cm.

14. The apparatus of claim 9 , wherein the complex oxide based pyrochlores comprise a thermal conductivity of approximately 10 W/m*K.

15. The apparatus of claim 9 , wherein the complex oxide based pyrochlores comprise an electronic band gap greater than zero without oxidizing at high temperatures of 500 to 800 K in the air.

16. The apparatus of claim 9 , wherein the complex oxide based pyrochlores comprises a predictive property of calculated cell parameters having a density of 8.75 mg/cm 3 .

Assignees

• Nasa

Inventors

• Goldsby Jon C

Classifications

• C01G55/002

  Compounds containing ruthenium, rhodium, palladium, osmium, iridium or platinum, with or without oxygen or hydrogen, and containing two or more other elements (C01G55/007 takes precedence) · CPC title

• H10N10/855 Primary

  comprising compounds containing boron, carbon, oxygen or nitrogen · CPC title

• C01P2002/36

  pyrochlore-type (A2B2O7) · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01G55/004

  Oxides; Hydroxides · CPC title