A kind of preparation method of high-purity lanthanum stannate nano powder

A technology of nano-powder and lanthanum stannate, which is applied in the field of preparation of pure-phase lanthanum stannate nano-powder, which can solve the problem of relatively stringent sintering temperature and sintering time, difficulty in significantly improving synthesis yield, and reaction cycle of synthesis yield. Short and other problems, to achieve the effect of shortened sintering time, fine particles, high degree of particle dispersion

Active Publication Date: 2015-10-28
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solid phase preparation of La 2 sn 2 o 7 For powder, the sintering temperature and sintering time are relatively strict, and the preparation cycle is very long
Studies by Chen et al. have shown that only when the sintering temperature is higher than 1520°C and the sintering time is about 34h, the single-phase La 2 sn 2 o 7 Powder can be synthesized; the preparation of La by hydrothermal method 2 sn 2 o 7 For powder, the sintering temperature is only about 180°C, the sintering time is 24h, and the synthesis yield is very low. To achieve large-scale synthesis, the requirements for high-pressure reactor equipment are relatively high, and the synthesis yield is difficult to be significantly improved; The chemical co-precipitation method has the advantages of high synthesis yield and short reaction cycle, but the disadvantage is that the purity is low and the sintering temperature is high, basically in the range of 1200-1400 °C, and the sintering time is about 10h

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  • A kind of preparation method of high-purity lanthanum stannate nano powder

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Embodiment 1

[0023] (1) Preparation of precursor solution A

[0024] The solute is oxalic acid dihydrate, and the solvent is deionized water; a certain amount of solute is added to the solvent and magnetically stirred until it is completely dissolved, then pipetted into a volumetric flask with a glass rod to constant volume, and prepared into a non-alcoholic solution with a concentration of 0.03mol / L. The color transparent solution is denoted as A solution.

[0025] (2) Preparation of precursor solution B

[0026] The solute is lanthanum nitrate, tin tetrachloride pentahydrate, and the solvent is deionized water; weigh a certain amount of lanthanum nitrate and tin tetrachloride pentahydrate at a molar ratio of 1:1, and introduce them into deionized water with magnetic stirring until completely Dissolve, and then use a glass rod to transfer to a volumetric flask to constant volume, and prepare a colorless and transparent solution with a concentration of 1.5 mol / L, which is recorded as solu...

Embodiment 2

[0033] (1) Preparation of precursor solution A

[0034] The solute is oxalic acid dihydrate, and the solvent is deionized water; a certain amount of solute is added to the solvent and magnetically stirred until it is completely dissolved, then pipetted into a volumetric flask with a glass rod to constant volume, and prepared into a non-alcoholic solution with a concentration of 0.1mol / L. The color transparent solution is denoted as A solution.

[0035] (2) Preparation of precursor solution B

[0036] The solute is lanthanum nitrate, tin tetrachloride pentahydrate, and the solvent is deionized water; weigh a certain amount of lanthanum nitrate and tin tetrachloride pentahydrate at a molar ratio of 1:1, and introduce them into deionized water with magnetic stirring until completely Dissolve, and then use a glass rod to transfer to a volumetric flask to constant volume, and prepare a colorless and transparent solution with a concentration of 0.5 mol / L, which is recorded as B sol...

Embodiment 3

[0043] (1) Preparation of precursor solution A

[0044] The solute is oxalic acid dihydrate, and the solvent is deionized water; a certain amount of solute is added to the solvent and magnetically stirred until it is completely dissolved, then pipetted into a volumetric flask with a glass rod to constant volume, and prepared into a non-alcoholic solution with a concentration of 0.6mol / L. The color transparent solution is denoted as A solution.

[0045] (2) Preparation of precursor solution B

[0046] The solute is lanthanum nitrate, tin tetrachloride pentahydrate, and the solvent is deionized water; weigh a certain amount of lanthanum nitrate and tin tetrachloride pentahydrate at a molar ratio of 1:1, and introduce them into deionized water with magnetic stirring until completely Dissolve, and then use a glass rod to transfer to a volumetric flask to constant volume, and prepare a colorless and transparent solution with a concentration of 0.2 mol / L, which is recorded as solut...

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Abstract

The invention relates to preparation of nano powder, and aims to provide a preparation method of high-purity lanthanum stannate nano powder. The method comprises the following steps: respectively preparing an oxalic acid dihydrate water solution and a lanthanum nitrate-tin tetrachloride pentahydrate water solution; dropwisely adding the lanthanum nitrate-tin tetrachloride pentahydrate water solution into the oxalic acid dihydrate water solution to form a uniform transparent solution; adding polyvinyl alcohol and a citric acid gelatinizer, and magnetically stirring uniformly; regulating the pH value with aqua ammonia, stirring at room temperature to settle, and drying to obtain powder; and grinding the powder, screening, and sintering to obtain the milky lanthanum stannate nano powder. The method has the advantages of low reaction temperature, simple technique, low cost and high yield, and can implement industrial production. The method has better sintering process conditions for preparing the powder than the prior art. The prepared product has the advantages of small particles, high particle dispersion degree, favorable powder flowability and no obvious aggregation phenomenon.

Description

technical field [0001] The invention relates to the preparation of nanopowder, in particular to a pure-phase lanthanum stannate (La 2 sn 2 o 7 ) The preparation method of nanopowder. Background technique [0002] La 2 sn 2 o 7 Rare earth lanthanum stannate compound belonging to pyrochlore structure. It has excellent physical and chemical properties such as high-temperature thermal stability, chemical stability, and ion conductivity, and has good application prospects in ion / electronic conductors, lithium-ion batteries, and catalysis. It has been reported in the literature that the La synthesized by chemical co-precipitation method 2 o 3 doped SnO 2 A new phase La in electrode materials 2 sn 2 o 7 The emergence of (LSO) plays an important role in improving the electrical properties of electrodes. [0003] Lanthanum stannate (La 2 sn 2 o 7 ) The main processes are solid phase method, hydrothermal method and chemical co-precipitation method. However, the solid-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00C01G19/00B82Y40/00
CPCB82Y40/00C01G19/00C01P2002/72
Inventor 张玲洁沈涛杨辉张继申乾宏陈乐生
Owner ZHEJIANG UNIV
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