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La doped SrTiO3 base oxide pyroelectric material and preparation method

A technology of thermoelectric materials and oxides, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problems of high cost, difficult to obtain crystal grains, high energy consumption, etc., and achieve short reaction time, synthesis and molding The effect of short time and low energy consumption

Inactive Publication Date: 2009-05-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the invention is to overcome the traditional solid phase reaction method to prepare SrTiO 3 It is difficult to obtain uniform and fine grains of base thermoelectric materials, and the process of powder preparation and ceramic sintering requires long-term high-temperature conditions (>1300°C) and atmosphere protection, resulting in high energy consumption and high cost.

Method used

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  • La doped SrTiO3 base oxide pyroelectric material and preparation method
  • La doped SrTiO3 base oxide pyroelectric material and preparation method

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Experimental program
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Effect test

Embodiment 1

[0026] Accurately weigh 12.5708 grams of Sr(NO 3 ) 2 and 0.2598 g La(NO 3 ) 3 ·6H 2 O, mixed and dissolved in 21.6 mL of deionized water, stirring continuously until a clear solution A was formed. Accurately measure 20.5 ml of Ti(OC 4 h 9 ) 4 , dispersed in 28.0 ml CH 3 CH 2 OH, after mixing well, add dropwise 13.7 ml of CH3 COOH, stirred to obtain a homogeneous transparent solution B. Drop solution A into solution B, and after mixing thoroughly, add 13.1 ml of C dropwise while stirring 3 h 8 o 3 , stirred at 40°C for 1.5 hours, and allowed to stand to form a gel. After the gel was dried at 60°C for 24 hours, it was placed in a box furnace and baked at 500°C for 2 hours to obtain black La 0.01 Sr 0.99 TiO 3 Precursor powder. After the powder is fully ground, put it into a graphite mold with an inner diameter of Φ=10mm, and put it into an SPS furnace with a vacuum of 7Pa, a pressure of 40MPa, a heating rate of 100°C / min, a sintering temperature of 900°C, and a h...

Embodiment 2

[0028] Accurately weigh 12.1899 grams of Sr(NO 3 ) 2 and 1.0392 g La(NO 3 ) 3 ·6H 2 O, mixed and dissolved in 43.2 ml of deionized water, stirring continuously until a clear solution A was formed. Accurately measure 20.5 ml of Ti(OC 4 h 9 ) 4 , dispersed in 56.1 mL of CH 3 CH 2 OH, after mixing well, drop in 27.5 ml of CH 3 COOH, stirred to obtain a homogeneous transparent solution B. Drop solution A into solution B, and after mixing thoroughly, add 21.9 ml of C dropwise while stirring 3 h 8 o 3 , stirred at 60°C for 1 hour, and allowed to stand to form a gel. After the gel was dried at 60°C for 36 hours, it was placed in a box furnace and fired at 560°C for 1 hour to obtain black La 0.04 Sr 0.96 TiO 3 Precursor powder. After the powder is fully ground, put it into a graphite mold with an inner diameter of Φ=15mm, and put it into an SPS furnace with a vacuum of 5Pa, a pressure of 45MPa, a heating rate of 100°C / min, a sintering temperature of 900°C, and a heat ...

Embodiment 3

[0030] Accurately weigh 11.9360 g of Sr(NO 3 ) 2 and 1.5588 g La(NO 3 ) 3 ·6H 2 O, mixed and dissolved in 43.2 ml of deionized water, stirring continuously until a clear solution A was formed. Accurately measure 20.5 ml of Ti(OC 4 h 9 ) 4 , dispersed in 84.1 mL of CH 3 CH 2 OH, after mixing well, drop in 41.2 ml of CH 3 COOH, stirred to obtain a homogeneous transparent solution B. Drop solution A into solution B, and after mixing thoroughly, add 21.9 ml of C dropwise while stirring 3 h 8 o 3 , stirred at 50°C for 0.5 hour, and allowed to stand to form a gel. After the gel was dried at 70°C for 36 hours, it was placed in a box furnace and fired at 530°C for 1.5 hours to obtain black La 0.06 Sr 0.94 TiO 3 Precursor powder. After the powder is fully ground, put it into a graphite mold with an inner diameter of Φ=20mm, and put it into an SPS furnace with a vacuum of 7Pa, a pressure of 45MPa, a heating rate of 100°C / min, a sintering temperature of 930°C, and a heat...

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Abstract

A La-doped strontium titanate (SrTiO3)-based oxide thermoelectric material and a preparation method thereof, belonging to the technical field of energy materials. The method is divided into two parts of powder synthesis and forming of bulk materials. The powder synthesis adopts the sol-gel method, takes tetrabutyl titanate, strontium nitrate and lanthanum nitrate as raw materials, takes deionized water and ethanol as solvents and takes acetic acid and glycerol as a catalyst and a chelating agent to prepare SrTiO3 gel with different La doping amount, and the temperature is kept at the temperature of 500-560 DEG C for 1-2 hours to obtain precursor powder. The bulk forming adopts the spark plasma sintering method, and the sintering conditions are as follows: the vacuum degree is 2-10Pa, the pressure is 40-50MPa, the heating rate is 100 DEG C / min, the sintering temperature is 900-1000 DEG C, and the holding time is 5-10min. The method synthesizes the La-doped SrTiO3-based bulk thermoelectric material with high chemical homogeneity, uniform and fine grains and single-phase perovskite structure under the conditions of lower reaction temperature and shorter reaction time. The preparation method has the advantages of simple and convenient process, short synthesis and forming time, and the like.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular provides a low-temperature sintered fine-grained La-doped SrTiO 3 The method of oxide-based thermoelectric materials involves sol-gel (sol-gel) method and spark plasma sintering (SparkPlasma Sintering, SPS) process. Background technique [0002] Today, the world's energy crisis and environmental problems are becoming more and more serious. As a functional material that can directly convert heat energy and electrical energy, thermoelectric materials have good application prospects in the fields of industrial waste heat power generation, automobile waste gas power generation, and low-temperature refrigeration. To measure the performance of thermoelectric materials, it is generally expressed by the dimensionless thermoelectric merit ZT: ZT=α 2 σT / κ, where α is the Seebeck coefficient of the material, σ is the electrical conductivity, κ is the thermal conductivity, T is th...

Claims

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Application Information

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IPC IPC(8): C01G23/00
Inventor 张波萍尚鹏鹏马宁
Owner UNIV OF SCI & TECH BEIJING
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