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Preparation method of strontium-doped lanthanum molybdate ceramic

A technology of doping lanthanum molybdate and strontium, which is applied in the field of preparation of strontium-doped lanthanum molybdate ceramics, can solve the problems of low efficiency and long preparation cycle, and achieve the effect of reducing the preparation temperature

Inactive Publication Date: 2011-06-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although it produces a powder with finer particles, it still shows the limitations of long preparation cycle and low efficiency.

Method used

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  • Preparation method of strontium-doped lanthanum molybdate ceramic
  • Preparation method of strontium-doped lanthanum molybdate ceramic
  • Preparation method of strontium-doped lanthanum molybdate ceramic

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Effect test

Embodiment 1

[0015] Embodiment 1: with analytical pure La (NO 3 ) 3 , (NH 4 ) 6 Mo 7 o 24 4H 2 O, citric acid according to the stoichiometric ratio La 2 Mo 2 o 9 Weighing and batching, wherein the molar ratio of citric acid to total metal examples is about 2:1, put the prepared material into a beaker, stir until a uniform solution is formed, pour it into a reaction container, and use a microwave at 180 ° C, Digest for 30 minutes at a power of 800w, filter the reacted solution, and then dry the product; the processed powder is isostatically pressed, and the formed disc is kept at 900°C for 12 Hours are sintered into porcelain.

[0016] from figure 1 It can be seen that the La prepared in this example 2 Mo 2 o 9 The surface of the powder becomes layered, and the dispersion type is good, and the specific surface area is large and easy to sinter.

Embodiment 2

[0017] Embodiment 2: to analyze pure La (NO 3 ) 3 , (NH 4 ) 6 Mo 7 o 24 4H 2 O, Sr 2 (NO 3 ) 2 , citric acid according to La 2-x Sr x Mo 2 o 9 Stoichiometric ratio x=0.05 Weighing and batching, wherein the molar ratio of citric acid and total metal example is about 2: 1, the prepared material is put into a beaker, stirred until forming a uniform solution and then poured into the reaction vessel, Use microwave to digest at 190°C and 700w power for 40 minutes, filter the reacted solution, and then dry the product; the processed powder is isostatically pressed, and the formed disc is re- It is sintered into porcelain at 930°C for 11 hours.

Embodiment 3

[0018] Embodiment 3: with analytical pure La (NO 3 ) 3 , (NH 4 ) 6 Mo 7 o 24 4H 2 O, Sr 2 (NO 3 ) 2 , citric acid according to La 2-x Sr x Mo 2 o 9 Stoichiometric ratio x=0.1 Weighing and batching, wherein the molar ratio of citric acid and total metal example is about 2: 1, the prepared material is put into the beaker, stirred until forming a uniform solution and then poured into the reaction vessel, Use microwave to digest at 200°C and 600w power for 50 minutes, filter the reacted solution, and then dry the product; the processed powder is isostatically pressed, and the formed disc is re- It is sintered into porcelain at 950°C for 10 hours.

[0019] figure 2 It is the powder obtained by microwave digestion (below) and the La after secondary sintering 2-x Sr x Mo 2 o 9 Ceramic powder (above) XRD pattern. It can be seen that the final La 2 Mo 2 o 9 of pure phase.

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Abstract

The invention discloses a preparation method of strontium-doped lanthanum molybdate ceramic, which is used for solving the technical problem that the traditional preparation method of lanthanum molybdate ceramic has long preparation cycle. The technical scheme of the preparation method comprises the following steps of: synthesizing by adopting a microwave synthesis process to obtain lanthanum molybdate powder, carrying out isostatic pressing on the powder, and then sintering to form ceramic. In the invention, the preparation cycle of the lanthanum molybdate ceramic is reduced to 11-13h from 48h in the background technology; and meanwhile, the preparation temperature is reduced.

Description

technical field [0001] The invention relates to a preparation method of lanthanum molybdate ceramics, in particular to a preparation method of strontium-doped lanthanum molybdate ceramics. Background technique [0002] Oxygen ion conductors have been widely used in solid oxide fuel cells, oxygen sensors, and solid-state ionic devices. If a traditional oxygen ion conductor (such as yttria-stabilized zirconia, YSZ) is used, its operating temperature must be high enough to obtain higher operating efficiency. For example, SOFC with YSZ as electrolyte must work at around 1000°C. High working temperature brings a series of problems such as high cost, difficulty in sealing, and difficulty in matching with electrode materials. Lanthanum molybdate is a good solid electrolyte as an oxygen ion conductor. Its oxygen ion conductivity at 800°C has reached above 0.06S / cm. Due to the simple preparation process and cheap raw materials, lanthanum molybdate ceramics have great competitive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/50C04B35/622
Inventor 刘霄樊慧庆
Owner NORTHWESTERN POLYTECHNICAL UNIV