Thermoelectric materials on the basis of bismuth telluride Bi2Te3
The bismuth telluride Bi2Te3 compound is a semiconductor material, possessing likewise ð- and n – conductivity.
Moreover, bismuth telluride crystals bear a remarkable quality. If, being prepared in a certain way semiconductor Bi2Te3 crystals (they are also called «pellets») of the n- and ð-types of conductivity are alternatively joined sequentially with each other by metal conductors, and this «package» is placed between two thermally conductive ceramic plates, then you get a device which is called the thermoelectric cooling module (TCM). When transmitting the direct electric current through the thermoelectric module the upper junctions of the «pellets» will become cool, while the lower – get warmer. As a result one ceramic plate is cooling the environment, while the opposite plate is the source of heating. But if the direct current is transmitted through the same device in the opposite direction, then the «hot» and «cold» sides shall change places.
Quality control of thermoelectric materials
The Hartman’s method of measuring thermoelectric parameters is used in order to control the quality of thermoelectric materials. When using this method to obtain precise calculations of the characteristics of thermoelectric efficiency it is necessary to apply corrections that are related to the thermal conduction of the lead and sound wires, with the thermal emission from the sample and wires, and also with the Joules heat, emitted in the lead wires.
1- sample, 2 – current distributing copper plate, 3 –constantan wire, 4 – current copper wire, 5 – sounding copper wire. Such a scheme allows to measure not only the thermoelectric efficiency, but also the thermo e.m.f., the electric conductivity and thermal conduction.
Thermoelectric generating material on the basis of bismuth telluride Bi2Te3
Method of production – extrusion
Thermoelectric properties of n-type crystals:
σ ≥ (140÷180)·10 -6V/K
σ = (1300÷1700) Ocm -1·cm -1
σ ≥ (130÷170)·10 -6 V/K
σ = (1400÷1800) Ohm -1·cm -1
Ingots and crystals (pellets) of bismuth telluride
«ADV-Engineering» Co., Ltd. produces ingots and pellets of p- and n- type conductivity from alloys on the basis of bismuth telluride to us them likewise in cooling an conditioning systems, and for generating electric power:1. ingots of alloys, obtained by using the method of zonal recrystallization;
2. ingots of alloys, obtained by using the extrusion method;
3. pellets for thermoelectric cooling and generating modules.
Thermoelectric elements (pellets) represent parallelepipeds or cylinders with a metallic covering on opposite sides.
Technical characteristics of the product
Ingots of bismuth telluride of the n- and p- types of conductivity
Crystals (pellets) of p- and n – types of conductivity for thermoelectric generating modules
*Geometric dimensions of crystals (pellets) can be changed in agreement with the client.
Crystals (pellets) from bismuth telluride Bi2Te3) of p- and n-types of conductivity with metallic covering for thermoelectric cooling modules
* Geometric dimensions of crystals (pellets) can be changed in agreement with the client
Conditions of delivery and payment
Terms of delivery, payment and prices of the products are determined by the conditions are determined by the conditions of the Agreement with the Client.
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