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Rare-earth sulfide thermoelectric material and preparation method thereof

A rare earth sulfide and thermoelectric material technology, which is applied in the field of rare earth sulfide thermoelectric materials and their preparation, can solve the problems of difficult control of carrier concentration, high processing temperature, etc., achieves good industrial application prospects, improves thermoelectric performance, and improves thermoelectricity. The effect of merit

Inactive Publication Date: 2013-06-26
HENAN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires high processing temperature, and the carrier concentration is not easy to control

Method used

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  • Rare-earth sulfide thermoelectric material and preparation method thereof
  • Rare-earth sulfide thermoelectric material and preparation method thereof
  • Rare-earth sulfide thermoelectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Raw materials (calcium oxide, lanthanum oxide, cerium oxide) according to the chemical composition formula Ca 0.02 La 0.8 Ce 1.18 S 3 The initial mixture is obtained after calculation and weighing. After the initial mixture is finely ground and mixed, it is vulcanized at 1000°C for 3 hours in a hydrogen sulfide atmosphere, and the powder material is obtained after cooling. The X-ray diffraction pattern of the powder sample is shown in figure 1 . The obtained powder material is pulverized and formed, and vacuum hot-pressed and sintered at 1400° C. under a pressure of 50 MPa for 10 minutes. After cooling, a pure cubic bulk thermoelectric material is obtained. The X-ray diffraction pattern of the sintered sample is shown in figure 2 .

Embodiment 2

[0028] Raw materials (calcium carbonate, lanthanum carbonate, cerium carbonate) according to the chemical composition formula Ca 0.03 La 0.5 Ce 1.47 S 3 The initial mixture is obtained after calculation and weighing. After the initial mixture is finely ground and mixed, it is vulcanized in a carbon disulfide atmosphere at 1200°C for 2 hours, and the powder material is obtained after cooling. The X-ray diffraction pattern of the powder sample is shown in image 3 . The obtained powder material is pulverized and formed, and vacuum discharge plasma sintering is carried out at 1500° C. under a pressure of 30 MPa for 20 minutes. After cooling, a block thermoelectric material of pure cubic crystal system is obtained.

Embodiment 3

[0030] Raw materials (calcium nitrate, lanthanum nitrate, cerium nitrate) according to the chemical composition formula Ca 0.04 La 0.4 Ce 1.56 S 3 The initial mixture is obtained after calculation and weighing. After the initial mixture is finely ground and mixed, it is vulcanized in a hydrogen sulfide atmosphere at 1300°C for 2 hours, and the powder material is obtained after cooling. The X-ray diffraction pattern of the powder sample is shown in Figure 4 . The obtained powder material is pulverized and formed, and vacuum hot-pressed and sintered at 1600° C. under a pressure of 80 MPa for 30 minutes. After cooling, a pure cubic bulk thermoelectric material is obtained.

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Abstract

The invention discloses a rare-earth sulfide thermoelectric material and a preparation method thereof. The chemical constitution formula of the rare-earth sulfide thermoelectric material is AxLayCe2-x-yS3, wherein A is at least one of alkaline earth elements Ca, Sr and Ba; x and y are respectively molar percentage coefficients of the alkaline earth elements and La; x is smaller than or equal to 1 and greater than or equal to 0; and y is smaller than or equal to 1 and greater than or equal to 0. The preparation method comprises the preparation steps of weighing the materials according to the chemical constitution formula, grinding and mixing the materials, vulcanizing for 1-3 hours under the condition of 800-1300 DEG C in sulfide atmosphere to obtain powder material; and vacuum sintering for 5-30 minutes at 1100-1600 DEG C under the pressure of 30-150 Mpa after grinding and molding, so as to obtain the massive thermoelectric material. The thermoelectric material disclosed by the invention has good thermoelectric properties and simple preparation method, and can be widely applied to the fields of afterheat and waste-heat power generation of medium and high temperature zones.

Description

technical field [0001] The invention belongs to the technical field of semiconductor thermoelectric material preparation, and in particular relates to a rare earth sulfide thermoelectric material and a preparation method thereof. Background technique [0002] With the development of industrialization, a large amount of fossil raw materials such as coal and petroleum are used for power generation and heating, which has caused global energy and environmental problems, and these problems are becoming more and more serious. Thermal energy and electric energy are the most important forms of energy in our real life, and electric energy is the most convenient and most transmitted and used form of energy. According to relevant data, only about 35% of the existing heat energy has been utilized, and most of the heat energy is discharged in the form of waste heat, which has not been well utilized. Thermoelectric material is a functional material that can directly convert heat energy a...

Claims

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Application Information

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IPC IPC(8): C04B35/547C04B35/622
Inventor 袁海滨易伟欣
Owner HENAN POLYTECHNIC UNIV
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