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Sr-doping oxide BiCuSeO thermoelectric material and preparation method thereof

A technology of thermoelectric materials and oxides, which is applied in the direction of lead-out wire materials of thermoelectric devices and the manufacture/processing of thermoelectric devices. And the effect of short molding time, high thermoelectric figure of merit and low thermal conductivity

Active Publication Date: 2012-09-05
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with these materials, oxide thermoelectric materials have attracted much attention because of their high-temperature stability and low price. However, oxide thermoelectric materials generally have poor electrical conductivity and high thermal conductivity, resulting in low dimensionless thermoelectric figure of merit. Such as Zn 0.96 al 0.02 Ga 0.02 The ZT value of O oxide at a temperature of 1247K is 0.65 [D. Berardan, et al. Solid State Comm.146, 97 (2008)], In 1.8 Ge 0.2 o 3 The ZT value of oxides at 1273K is 0.45 [M.Ohtaki, et al.J.Electron.Mater.38, 1234(2009)]. However, these oxides cannot be compared with traditional alloys in application

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  • Sr-doping oxide BiCuSeO thermoelectric material and preparation method thereof
  • Sr-doping oxide BiCuSeO thermoelectric material and preparation method thereof
  • Sr-doping oxide BiCuSeO thermoelectric material and preparation method thereof

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preparation example Construction

[0020] The invention provides a Sr-doped oxide BiCuSeO thermoelectric material and a preparation method thereof. The chemical formula of the Sr-doped oxide BiCuSeO thermoelectric material is Bi 1-x Sr x CuSeO, x=0.025-0.125, preferably, x=0.025-0.075. The electrical conductivity of the thermoelectric material ranges from 470 to 48000 Sm -1 , the variation range of thermoelectric potential is +100~+375μVK -1 , the variation range of thermal conductivity is 0.45~1.05Wm -1 K -1 , the maximum dimensionless thermoelectric figure of merit is 0.76 at 873K.

[0021] The above-mentioned Sr-doped oxide BiCuSeO thermoelectric material is prepared by the following method:

[0022] (1) Raw material preparation: using Bi 2 o 3 (purity of 99.9%), SrO (purity of 99.99%), Cu (purity of 99.99%), Se (purity of 99.99%) and Bi (purity of 99.99) powders as initial raw materials, according to Bi 2 o 3 : SrO: Cu: Se: Bi=(1 / 3-x): x: 1: 1: [1-2*(1 / 3-x)] atomic ratio batching, x=0.025~0.125.

...

Embodiment 1

[0028] Example 1: A kind of Sr-doped oxide BiCuSeO thermoelectric material Bi0.975Sr0.025CuSeO is prepared by the method provided by the present invention, and the specific preparation steps are as follows:

[0029] (1) Prepare raw materials: according to Bi 2 o 3 :SrO:Cu:Se:Bi=(1 / 3-x):x:1:1:[1-2*(1 / 3-x)] atomic ratio batching, x=0.025. Bi 2 o 3(purity 99.9%), SrO (purity 99.99%), Cu (purity 99.99%), Se (purity 99.99%) and Bi (purity 99.99) are powders.

[0030] (2) Mix raw materials. The above raw materials were put together into a ball mill and ball milled at 100 rpm for 1 h.

[0031] (3) Put the uniformly mixed powder into a steel mold with a diameter of 10-20 mm and press it into a disc under a pressure of 150 MPa.

[0032] (4) Place the cold-pressed wafer in a quartz tube and sinter it at 300°C for 240 hours at a heating rate of 180°C per hour to obtain a Sr-doped oxide BiCuSeO with the same diameter as the mold and a height of 4mm. bulk material.

[0033] (5) T...

Embodiment 2

[0035] Example 2: A kind of Sr-doped oxide BiCuSeO thermoelectric material Bi0.925Sr0.075CuSeO is prepared by the method provided by the present invention, and the specific preparation steps are as follows:

[0036] (1) Prepare raw materials: according to Bi 2 o 3 :SrO:Cu:Se:Bi=(1 / 3-x):x:1:1:[1-2*(1 / 3-x)] atomic ratio batching, x=0.075. Bi 2 o 3 (purity 99.9%), SrO (purity 99.99%), Cu (purity 99.99%), Se (purity 99.99%) and Bi (purity 99.99) are powders.

[0037] (2) Mix raw materials. The above raw materials were put together into a ball mill and ball milled at 100 rpm for 50 h.

[0038] (3) Put the uniformly mixed powder into a steel mold with a diameter of 10-20 mm and press it into a disc under a pressure of 250 MPa.

[0039] (4) Place the cold-pressed wafer in a quartz tube and sinter it at 700°C for 48 hours at a heating rate of 40°C per hour to obtain a Sr-doped oxide with a diameter of 10-20mm and a height of 6mm BiCuSeO bulk material.

[0040] (5) Then Bi 1...

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Abstract

The invention discloses a Sr-doping oxide BiCuSeO thermoelectric material and a preparation method of the Sr-doping oxide BiCuSeO thermoelectric material, belonging to the technical field of new energy source materials. The preparation method comprises the following steps of ball-milling material mixing, solid-phase sintering, ball-milling refining, and discharging plasma sintering, and specifically comprises the following steps of: mixing Bi2O3 with the purity of 99.99%, SrO with the purity of 99.99%, Cu with the purity of 99.99%, Se with the purity of 99.99% and Bi with the purity of 99.99% according to a stoichiometric ratio, uniformly mixing in a ball milling manner, carrying out cold-pressing, carrying out a solid-phase reaction, pulverizing in the ball milling manner, and then carrying out the discharging plasma sintering to prepare Bi1-xSrxCuSeOoxide block bodies (x=0-0.125). Compared with other oxide thermoelectric materials, the Sr-doping oxide BiCuSeO thermoelectric material disclosed by the invention has the advantages of high conductivity, high temperature-difference electrodynamic potential, low thermal conductivity and the like; and the preparation method has the advantages of simple and convenient process, short synthesis and formation times and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a Sr-doped oxide BiCuSeO thermoelectric material and a preparation method thereof, and involves ball milling, solid-state reaction and discharge plasma sintering processes. Background technique [0002] Thermoelectric materials are energy materials that can directly convert electrical energy and thermal energy into each other. The remarkable advantage of thermoelectric materials is an environmentally friendly green energy material with no noise, no pollution, and no moving parts. An important performance index to measure thermoelectric materials is thermoelectric figure of merit. Thermoelectricity includes two phenomena of thermoelectric refrigeration and temperature difference power generation. The power generation and cooling efficiency are directly proportional to the thermoelectric figure of merit. For a certain material, the figure of merit of its ...

Claims

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Application Information

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IPC IPC(8): H01L35/18H01L35/34C04B32/00
Inventor 裴延玲宫声凯
Owner BEIHANG UNIV
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