Thermoelectric conversion material

Patent metadata

Field	Value
Publication number	US-10121953-B2
Application number	US-201615243832-A
Country	US
Kind code	B2
Filing date	Aug 22, 2016
Priority date	Oct 27, 2015
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

The present invention provides a thermoelectric conversion material represented by the following chemical formula Mg 3+m A a B b D 2-e E e . The element A represents at least one selected from the group consisting of Ca, Sr, Ba and Yb. The element B represents at least one selected from the group consisting of Mn and Zn. The value of m is not less than −0.39 and not more than 0.42. The value of a is not less than 0 and not more than 0.12. The value of b is not less than 0 and not more than 0.48. The element D represents at least one selected from the group consisting of Sb and Bi. The element E represents at least one selected from the group consisting of Se and Te. The value of e is not less than 0.001 and not more than 0.06. The thermoelectric conversion material has a La 2 O 3 crystalline structure. The thermoelectric conversion material is of n-type. The present invention provides a novel thermoelectric conversion material.

First claim

The invention claimed is:

1. A thermoelectric conversion material represented by the following chemical formula (I):
Mg 3+m A a B b D 2-e E e   (I)

where
the element A represents at least one selected from the group consisting of Ca, Sr, Ba and Yb;
the element B represents at least one selected from the group consisting of Mn and Zn;
the value of m is not less than −0.39 and not more than 0.42;
the value of a is not less than 0 and not more than 0.12;
the value of b is not less than 0 and not more than 0.48;
the element D represents at least one selected from the group consisting of Sb and Bi;
the element E represents at least one selected from the group consisting of Se and Te;
the value of e is not less than 0.001 and not more than 0.06;
the thermoelectric conversion material has a La 2 O 3 crystal structure; and
the thermoelectric conversion material is of n-type.

2. The thermoelectric conversion material according to claim 1 , wherein
the following mathematical formula (II) is satisfied:
m=m′−a−b   (II)

where
at least one of the values of a and b is more than 0; and
the value of m′ is not less than 0 and not more than 0.42.

3. The thermoelectric conversion material according to claim 1 , wherein
the value of e is not less than 0.004 and not more than 0.020.

4. The thermoelectric conversion material according to claim 2 , wherein
the value of e is not less than 0.004 and not more than 0.020.

5. The thermoelectric conversion material according to claim 1 , wherein
the following mathematical formula (III) is satisfied:
a=b= 0  (III).

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Tamaki Hiromasa
• Kanno Tsutomu
• Sato Hiroki
• Sakai Akihiro
• Takahashi Kohei

Classifications

• C22C23/00

  Alloys based on magnesium · CPC title

• C04B35/547

  based on sulfides or selenides {or tellurides} · CPC title

• H10N10/852 Primary

  comprising tellurium, selenium or sulfur · CPC title

• C22C1/0408

  Light metal alloys · CPC title

• H01L35/16 Primary

  Electricity · mapped topic