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Lanthanum indium co-doped strontium titanate conductor material and preparation method thereof

A conductor material, co-doping technology, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, electrical components, etc., can solve the problem of not being able to improve the electronic conductivity and ionic conductivity of materials at the same time

Inactive Publication Date: 2016-09-28
HONGHE COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the single-doped strontium titanate at the A site or the B site cannot improve the electronic conductivity and ion conductivity of the material at the same time.

Method used

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  • Lanthanum indium co-doped strontium titanate conductor material and preparation method thereof
  • Lanthanum indium co-doped strontium titanate conductor material and preparation method thereof
  • Lanthanum indium co-doped strontium titanate conductor material and preparation method thereof

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preparation example Construction

[0037] The present invention also provides a method for preparing the lanthanum-indium co-doped strontium titanate conductor material described in the above technical solution, comprising the following steps:

[0038] (1) mixing tetrabutyl titanate, lanthanum oxide, and indium oxide with isopropanol and absolute ethanol to obtain an anhydrous mixed precursor solution of tetrabutyl titanate, lanthanum oxide, and indium oxide;

[0039] (2) Aging the anhydrous mixed precursor solution of tetrabutyl titanate, lanthanum oxide and indium oxide obtained in the step (1) with the strontium salt solution to obtain a strontium titanate sol co-doped with lanthanum and indium ;

[0040] (3) removing the solvent in the sol obtained in the step (2) to obtain a strontium titanate gel co-doped with lanthanum and indium;

[0041] (4) Calcining the lanthanum and indium co-doped strontium titanate gel obtained in the step (3) to obtain the lanthanum and indium co-doped strontium titanate conduct...

Embodiment 1

[0051] Lanthanum is doped at 30% and Indium is doped at 4%:

[0052] (1) First according to Sr 0.7 La 0.3 Ti 0.96 In 0.04 o 3 The stoichiometric ratio in (the molar ratio of strontium and lanthanum is 70:30; the molar ratio of titanium and indium is 96:4) Weigh 1.63g tetrabutyl titanate, 0.24g lanthanum oxide and 0.028g indium oxide and then mix tetratitanate Dissolve butyl ester in a mixed solvent of 30mL isopropanol and 10mL absolute ethanol, stir until uniform, put lanthanum oxide and indium oxide into the mixed solution of tetrabutyl titanate, and stir magnetically at 600r / min for 3h An anhydrous mixed precursor solution of tetrabutyl titanate, lanthanum oxide and indium oxide was obtained.

[0053] (2) According to Sr 0.7 La 0.3 Ti 0.96 In 0.04 o 3 Stoichiometric ratio in (strontium, lanthanum molar ratio is 70:30) Weigh 0.75g strontium acetate, then dissolve strontium acetate in 3mL deionized water, stir until completely dissolved to form strontium salt solutio...

Embodiment 2

[0063] Lanthanum is doped at 30% and Indium is doped at 6%:

[0064] (1) First according to Sr 0.7 La 0.3 Ti 0.94 In 0.06 o 3 Stoichiometric ratio in Weigh 1.6g tetrabutyl titanate, 0.24g lanthanum oxide and 0.042g indium oxide; then dissolve tetrabutyl titanate in a mixed solvent of 40mL isopropanol and 10mL absolute ethanol, stir until uniform Finally, put lanthanum oxide and indium oxide into the mixed solution of tetrabutyl titanate, and stir magnetically at a rate of 600r / min for 3h to obtain an anhydrous mixed precursor solution of tetrabutyl titanate, lanthanum oxide and indium oxide.

[0065] (2) According to Sr 0.7 La 0.3 Ti 0.94 In 0.06 o 3 Stoichiometric ratio in Weigh 0.75g strontium acetate, then dissolve strontium acetate in 3mL deionized water, stir until completely dissolved to form strontium salt solution; mix the anhydrous mixed precursor solution of tetrabutyl titanate, lanthanum oxide and indium oxide Mixed with strontium acetate solution, and mag...

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Abstract

The invention provides a lanthanum indium co-doped strontium titanate conductor material and a preparation method thereof. According to the invention, a material chemical general formula is Sr1-xLaxTi1-yInyO3, and 0.1< / =x< / =0.4 and 0.03< / =y< / = 0.1; tetrabutyl titanate is used as a titanium source; anhydrous ethanol and isopropyl alcohol are used as solvents; the oxide of lanthanum and indium is used as a dopant raw material; a sol-gel method is used to prepare the lanthanum indium co-doped strontium titanate conductor material; the lanthanum indium co-doped strontium titanate conductor material has a single cubic phase perovskite structure, has the advantages of good stability, excellent electronic conduction and ion conductance, and can satisfy the application needs of many fields such as a fuel cell anode material, an oxygen permeation membrane, an automobile exhaust gas sensor and the like; and compared with a traditional solid-phase sintering method, the preparation method provided by the invention has the advantages of short reaction time, low energy consumption, high product density, uniform composition, wide application prospect and the like.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a lanthanum-indium co-doped strontium titanate conductor material and a preparation method thereof. Background technique [0002] Strontium titanate is a perovskite type wide band gap oxide with a band gap of 3.2eV at room temperature. Because of its high dielectric constant, low loss, good thermal stability and excellent catalytic activity, it has become a widely used electronic functional ceramic material in sensors, fuel cell electrodes, oxidative dehydrogenation, photocatalysis , three-way catalysts and other fields have shown good application prospects. However, the conductivity of strontium titanate at room temperature is very low, which greatly limits its application in conductive materials. [0003] In order to further improve the performance of strontium titanate, a doping method is usually adopted in the prior art. In the strontium titanate material, the...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B13/00
CPCH01B1/16H01B13/00
Inventor 单科易中周殷锡涛刘卫
Owner HONGHE COLLEGE
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