Toshima Manufacturing Co., Ltd. Materials System Division
TOSHIMA Manufacturing Co.,Ltd. Materials System Division
Toshima Manufacturing Co., Ltd. Materials System Division
Toshima Manufacturing Co., Ltd. Materials System Division

Thermoelectric Conversion materials

Thermoelectric conversion attracts attention as energy harvest. On the basis of technical know-how of material developing, Toshima provides new thermoelectric conversion materials.

Metal type [N-type]

Bi2Te3
CoSb2.85Te0.15
Mg2Si

Metal type [P-type]

Bi0.3Sb1.7Te3
CoSb3
MnSi1.73

Oxide type

NaXCoOy
Ca3Co4O9

Joint type

Bi2Te3 - Joint material - CoSbTe
BiSbTe - Joint material - CoSb3
Electrode material - Bi-base material, Co-base material - Electrode material
Electrode material - Supplied material or trial piece - Electrode material
An example of Junction material
An example of Junction material
Segment type
Segment type
Bi2Te3(N-type)& Bi0.3Sb1.7Te3(P-type)
Bi2Te3(N-type)& Bi0.3Sb1.7Te3(P-type)
Evaluation of homogeneity about BiTe-base materials sintered by hot pressing method
TypeGroup50℃(323K)100℃(373K)150℃(423K)
ρ
10-5Ωm
S
10-6V/K
S2
10-3W/mK2
ρ
10-5Ωm
S
10-6V/K
S2
10-3W/mK2
ρ
10-5Ωm
S
10-6V/K
S2
10-3W/mK2
PAAVE.1.047182.53.181.328193.92.831.66201.22.44
S.D.0.0261.40.070.033 1.00.050.0411.20.05
BAVE.1.089183.13.081.357193.22.751.693200.22.37
S.D.0.0211.70.070.0251.90.050.0311.50.04
NAAVE. 0.850-131.72.041.053-144.31.981.276-151.41.8
S.D. 0.0101.50.050.012 1.00.040.014 1.00.03
BAVE.0.893-131.81.951.088-143.21.891.321-150.21.71
S.D.0.0071.70.060.0091.40.050.0111.40.04

YaMamoto et al. (2009) Evaluation of homogeneity about BiTe-base materials sintered by hot pressing method.
Annual meeting of the Thermoelectrics Society of Japan 2012.

MnSi1.73
MnSi1.73
Mg2Si
Mg2Si

New type of Bi2Te3+α(N type) 

Research and development of BiTe based thermoelectric conversion materials have been progressed for a long time but the performance of n type is lower than that of p type. For that reason, Peltier element has been commercialized, whereas practical application as a power generation element was late.

Our new material, Bi2Te3 + α (n type), has high performance evaluation ZT from 0.8 to 0.94 in the low temperature range from 50 ℃ to 150 ℃ (in-house evaluation data) It is a promising material that can be expected as a power generation element. Also, as another problem for practical application, Selenium is often used as a toxic element in general. With Bi2Te3 + α, we do not use toxic dopants such as Se and there is a possibility that application which can be adopted widely spread. We started supplying this prototype sample. Please contact us for details such as shape, delivery date etc.

In-house evaluation data
Temparature(℃)Temparature(K)Resistivity(Ωm)Seebeck coefficient(V/K)Thermal conductivity(W/mK)ZT
503237.40E-06-1.49E-041.020.94
1003739.04E-06-1.54E-041.10.89
1504231.07E-05-1.57E-041.220.8