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Compound lanthanum zirconate proton conductor mixed material and its preparing method

A technology of proton conductors and compound doping, applied in the direction of non-metallic conductors, chemical instruments and methods, chemical/physical/physicochemical processes, etc., can solve problems such as not being well utilized, and achieve the effect of excellent electrical conductivity

Inactive Publication Date: 2007-08-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many other components that have not been developed and studied, and cannot make good use of La 2 Zr 2 o 7 characteristic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Get 53.63 grams of lanthanum oxide, 32.78 grams of zirconia, 13.10 grams of ytterbium oxide, and 0.49 grams of strontium carbonate to prepare La 1.98 Sr 0.02 Zr 1.6 Yb 0.4 o 7-δ (δ=0.21). The mixture was mixed by ball milling, using absolute ethanol as the medium, and the ball milling time was 6 hours. After drying, it was pre-synthesized at 1400°C and kept for 8 hours. After ball milling again, it is dried, sieved and granulated, and the sample is formed by dry pressing at 100 MPa + isostatic pressing at 200 MPa, sintered in air at 1600 °C, heating rate of 3 °C / min, and heat preservation for 10 hours to obtain a sintered body. The proton conductivity at 700 °C in a wet hydrogen atmosphere is 6.9×10 -4 S / cm.

Embodiment 2

[0020] Get 53.28 grams of lanthanum oxide, 32.90 grams of zirconia, 13.15 grams of ytterbium oxide, and 0.67 grams of calcium carbonate to prepare La 1.96 Ca 0.04 Zr 1.6 Yb 0.4 o 7-δ (δ=0.22). The mixture was mixed by ball milling, using absolute ethanol as the medium, and the ball milling time was 6 hours. After drying, it was pre-synthesized at 1400°C and kept for 10 hours. After ball milling again, it is dried, sieved and granulated, and the sample is formed by dry pressing at 100 MPa + isostatic pressing at 200 MPa, sintered in air at 1600 °C, heating rate 4 °C / min, and heat preservation for 15 hours to obtain a sintered body. The proton conductivity at 700 °C in a wet hydrogen atmosphere is 6.07×10 -4 S / cm.

Embodiment 3

[0022] Get 56.82 grams of lanthanum oxide, 42.81 grams of zirconia, 0.32 grams of gadolinium oxide, and 0.05 grams of strontium carbonate to prepare La 1.998 Sr 0.002 Zr 1.99 Gd 0.01 o 7-δ (δ=0.006). Mixed by ball milling, using absolute ethanol as the medium, and the ball milling time is 4 hours. After drying, it was pre-synthesized at 1400°C and kept for 2 hours. After ball milling again, it is dried, sieved and granulated, and the sample is formed by dry pressing at 50 MPa + isostatic pressing at 120 MPa, sintered at 1650°C in air, with a heating rate of 10°C / min, and heat preservation for 2 hours to obtain a sintered body. At 700°C It has high proton conductivity in wet hydrogen atmosphere.

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PUM

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Abstract

The invention relates to recombination doping zirconic acid lanthanum proton conductor material and its preparation method. Its chemical formula and matching is: La2-yNyZr2-xMxO7-delta;M is that Yb3+,Er3+,Gd3+,Sc3+ are doping in Zr bit, x is 0.01-1;N is Sr2+,Ca2+ are doping in La bit, y is 0.002-0.4;delta is oxygen vacant site, it depends on x and y. Dosage as proportion, water or alcohol is the medium, it is ball grinded and mixed for 4-10 hours and then dried, then synthesized in 1400DEG C, heat preserved for 2-20 hours. The synthesized material is then ball grinded, dried, screened, and loaded into die. The pressure is 50-120MPa, it is isostatic pressing, the pressure is 120-300MPa;it is adglutinated in 1400-1650DEG C, the warming-up rate is 2-10DEG C / minute, heat preserved for 2-50 hours, then cooled to room temperature, the doping zirconic acid lanthanum material is produced. The invention adopts the recombination doping which is not reported to produce proton conductor material which possesses perfect conductivity; it lays the foundation of developing hydrogen gas and steam sensor, hydrogen pump, accelerant and concentration cell electrolyte material.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, in particular to a composite doped lanthanum zirconate proton conductor material and a preparation method thereof. Background technique [0002] Studies have shown that pyrochlore-type materials have excellent electrical properties, high ionic conductivity required for solid electrolytes and high mixed conductivity required for electrode materials, thus making them possible to become electrolytes or electrode materials for fuel cells. Lanthanum zirconate (La 2 Zr 2 o 7 ) is a hot spot in the research of pyrochlore, especially its electrical properties. Its unique properties make it have broad prospects for application in many fields, such as: catalytic combustion active agent, high temperature thermal insulation coating , electrolytes for solid oxide fuel cells, immobilization substrates for actinide elements in nuclear waste, etc. Pyrochlore-type substances have the general chemica...

Claims

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Application Information

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IPC IPC(8): H01B1/06C04B35/48C04B35/622B01J19/00
Inventor 郭瑞松尹自光彭珍珍戚雯
Owner TIANJIN UNIV
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