Barium copper tellurium based p-type thermoelectric material and preparation method thereof
A thermoelectric material, p-type technology, applied in the direction of thermoelectric device junction lead-out material, thermoelectric device manufacturing/processing, etc., can solve the problem of low thermoelectric conversion efficiency and so on
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Embodiment 1
[0024] Example 1: In a glove box filled with argon atmosphere, weigh out barium particles (99.5%), copper chips (99.999%), tellurium particles (99.999%), and mix them according to the molar ratio of 1:2-δ:2 , put the raw material into an amorphous carbon crucible or a boron nitride crucible and encapsulate it in a quartz tube. Vacuum the quartz tube with a vacuum pump until the vacuum degree is lower than 1Х10 -6 Seal with oxyhydrogen flame during torr. The melting process was carried out in a box-type heating furnace, heated to 800 °C at 1 °C / min, then kept for 7 days and cooled with the furnace. The product was confirmed to be BaCu by XRD powder comparison. 2 Te 2 pure phase ( Figure 5 ). The product is hot-pressed and sintered to form the ground powder. The hot pressing conditions are 600° C., 70-80 MPa, and the holding time is 30 minutes. The density of the obtained sample is above 95%. Then measure the thermal conductivity, electrical conductivity, Seebeck coeffi...
Embodiment 2
[0025] Example 2: In a glove box filled with argon atmosphere, weigh out barium particles (99.5%), copper chips (99.999%), tellurium particles (99.999%) and selenium powder (99.9999%), according to 1:2:2 - The molar ratio of b:b, put the raw material into an amorphous carbon crucible or a boron nitride crucible, and encapsulate it in a quartz tube. Vacuum the quartz tube with a vacuum pump until the vacuum degree is lower than 1Х10 - 6Seal with oxyhydrogen flame during torr. The melting process was carried out in a box-type heating furnace, heated to 800 °C at 1 °C / min, then kept for 7 days and cooled with the furnace. The product is hot-pressed and sintered to form the ground powder. The hot pressing conditions are 600° C., 70-80 MPa, and the holding time is 30 minutes. The density of the obtained sample is above 95%. Then measure the thermal conductivity, electrical conductivity, Seebeck coefficient, thermoelectric figure of merit of the sample in the range of 300-770K,...
Embodiment 3
[0026] Example 3: In a glove box filled with an argon atmosphere, weigh out barium particles (99.5%), copper sheets (99.999%), anhydrous copper chloride (CuCl 2 , 99.5%), tellurium particles (99.999%), according to the molar ratio of 1:2-b / 2:b / 2:2, put the raw materials into an amorphous carbon crucible or a boron nitride crucible, and encapsulate it in in a quartz tube. Vacuum the quartz tube with a vacuum pump until the vacuum degree is lower than 1Х10 -6 Seal with oxyhydrogen flame during torr. The melting process was carried out in a box-type heating furnace, heated to 800 °C at 1 °C / min, then kept for 7 days and cooled with the furnace. The product is hot-pressed and sintered to form the ground powder. The hot pressing conditions are 600° C., 70-80 MPa, and the holding time is 30 minutes. The density of the obtained sample is above 95%. Then measure the thermal conductivity, electrical conductivity, Seebeck coefficient, thermoelectric figure of merit of the sample in...
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