Prepn of Bi2Te3-base nano thermoelectric material powder containing RE element
A technology of rare earth elements and thermoelectric materials, applied in chemical instruments and methods, binary selenium/tellurium compounds, inorganic chemistry, etc., can solve the problems of high raw material requirements, long production cycle, complex process, etc., and achieve high product purity and cost. Low, simple process effect
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Embodiment 1
[0017] 1) The analytically pure BiCl 3 , high-purity tellurium powder (>99.99wt%), according to the proportion of Bi:Te atomic percentage 2:3, and weigh the analytical pure LaCl according to the ratio of La atomic percentage of 10% 3 , mixed in absolute ethanol;
[0018] 2) Place the prepared mixed solution in the reaction vessel of the high-pressure reactor (WDF-0.25 type) (the filling degree is 80%), and add the reducing agent NaBH to the solution 4 , then immediately seal;
[0019] 3) Heating the reaction vessel to 180° C. and keeping it warm for 12 hours.
[0020] 4) After the reaction is completed, cool down to room temperature naturally, collect the powdered reaction product at the bottom of the kettle, wash it several times with deionized water, absolute ethanol and acetone in sequence, and dry the powder in vacuum at 100°C for 6 hours.
[0021] According to chemical analysis, the content of La element in the synthesized product is 9.05%.
Embodiment 2
[0023] 1) Raw material: Analytical pure BiCl 3 , high-purity tellurium powder (>99.99wt%), analytically pure Er 2 o 3 . According to the ratio of Bi:Te atomic ratio of 2:3, and weigh the analytical pure Er according to the ratio of Er atomic content percentage to 10%. 2 o 3 .
[0024] 2) The above raw materials were weighed in proportion and mixed in the organic solvent DMF, and an appropriate amount of reducing agent NaBH was added to the solution 4 . The prepared solution was placed in the reaction vessel of the autoclave (WDF-0.25 type) (filling degree is 80%).
[0025] 3) After sealing the reaction vessel, heat it slowly to 150° C. and keep it warm for 24 hours. During the heat preservation reaction, the autogenous pressure inside the reaction vessel is about 3.5 MPa.
[0026] 4) After the reaction is completed, cool down to room temperature naturally, reduce the pressure, collect the powdery reaction product at the bottom of the kettle, wash it repeatedly with 1% ...
Embodiment 3
[0029] 1) The analytically pure BiCl 3 , high-purity tellurium powder (>99.99wt%) is proportioned according to the ratio of Bi:Te atomic percentage of 2:3, and LaCl is weighed according to the ratio of La and Sn atomic content percentages to 8% and 2% of the total amount of all raw materials, respectively. 3 and SnCl 2 ;
[0030] 2) Mix all the raw materials in absolute ethanol, place in the reaction vessel of the autoclave (WDF-0.25 type) (the filling degree is 80%), and add the reducing agent KBH 4 , then immediately seal;
[0031] 3) Heating the reaction vessel to 180° C. and keeping it warm for 6 hours.
[0032] 4) After the reaction is completed, cool down to room temperature naturally, collect the powdered reaction product at the bottom of the kettle, wash it several times with deionized water, absolute ethanol and acetone in sequence, and dry the powder in vacuum at 100°C for 6 hours.
[0033] According to chemical analysis, the content of La element in the synthesi...
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