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Lanthanum stannate, europium stannate and its composite stannate nanopowder synthesis method

A technology of composite stannate and nanopowders, which is applied in the fields of tin compounds, chemical instruments and methods, rare earth metal compounds, etc., and can solve problems such as public reports of composite stannate nanopowders that have not yet been seen.

Inactive Publication Date: 2007-04-25
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moon et al. reported the use of SnCl 4 Hydrothermal synthesis of lanthanum stannate (La 2 sn 2 o 7 ) method (J.Moon et al.J.Am.Ceram.Soc., 84,2531 (2001)), there is no disclosure about the hydrothermal synthesis of pyrochlore-type lanthanum-europium composite stannate nanopowder to report

Method used

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  • Lanthanum stannate, europium stannate and its composite stannate nanopowder synthesis method
  • Lanthanum stannate, europium stannate and its composite stannate nanopowder synthesis method
  • Lanthanum stannate, europium stannate and its composite stannate nanopowder synthesis method

Examples

Experimental program
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Embodiment 1

[0020] Synthetic La 2-x Eu x sn 2 o 7 (x=0), ie La 2 sn 2 o 7 . 0.692 grams of lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) be dissolved in 160 milliliters of deionized water, the molar concentration of lanthanum nitrate is 0.01 mol / liter, after stirring for 3 minutes, add 0.478 gram of potassium stannate (K 2 SnO 3 ·3H 2 (0), potassium stannate molar concentration is 0.01 mol / liter, after continuing to stir for 5 minutes, obtains final solution, and this solution rare earth nitrate total molar concentration is 0.01 mol / liter, does not contain europium nitrate, i.e. x=0. Put the above-mentioned prepared solution into the polytetrafluoroethylene inner lining of the autoclave, the inner lining volume is 200 milliliters, and the control filling degree is 80%. The solution is treated at 180° C. for 30 hours, the treated solution is centrifuged, washed, and the product is dried to obtain a nanopowder. The XRD collection of this product is shown in Fig. 1 (a), and this colle...

Embodiment 2

[0022] Synthetic La 2-x Eu x sn 2 o 7 (x=0.5), namely La 1.5 Eu 0.5 sn 2 o 7 . 2.078 grams of lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) be dissolved in 160 milliliters of deionized water, the molar concentration of lanthanum nitrate is 0.03 mol / liter, after stirring for 3 minutes, add 0.714 gram of europium nitrate (Eu(NO 3 ) 3 ·6H 2 (2), the molar concentration of europium nitrate is 0.01 mol / liter, after stirring for 3 minutes, add 1.709 gram of sodium stannate (Na 2 SnO 3 ·3H 2 (2), the molar concentration of sodium stannate is 0.04 mol / liter, and after continuing to stir for 5 minutes, the final solution is obtained. In this solution, the total molar concentration of rare earth nitrate is 0.04 mol / liter, and the ratio of lanthanum and europium is 3: 1, namely x=0.5. Put the above-mentioned prepared solution into the polytetrafluoroethylene inner lining of the autoclave, the inner lining volume is 200 milliliters, and the control filling degree is 90%. The so...

Embodiment 3

[0024] Synthetic La 2-x Eu x sn 2 o 7 (x=1), namely LaEuSn 2 o 7 . 6.928 grams of lanthanum nitrate (La(NO 3 ) 3 ·6H 2O) be dissolved in 160 milliliters of deionized water, the molar concentration of lanthanum nitrate is 0.1 mol / liter, after stirring for 3 minutes, add 7.136 grams of europium nitrate (Eu(NO 3 ) 3 ·6H 2 (0), europium nitrate molar concentration is 0.1 mol / liter, after stirring for 3 minutes, add 9.568 grams of potassium stannate (K 2 SnO 3 ·3H 2 (2), potassium stannate molar concentration 0.2 mol / liter, after continuing to stir for 5 minutes, obtain final solution, rare earth nitrate total molar concentration is 0.2 mol / liter in this solution, lanthanum europium ratio is 1: 1, promptly x= 1. Put the above-mentioned prepared solution into the polytetrafluoroethylene inner lining of the autoclave, the inner lining volume is 200 milliliters, and the control filling degree is 80%. Treat the solution at 200°C for 24 hours, centrifuge and wash the trea...

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Abstract

The invention discloses a synthesizing method of lanthanum stannate, europium stannate and composite stannate nanometer powder, which comprises the following steps: dissolving lanthanum stannate and europium stannate with different molar rates or lanthanum stannate or europium stannate in the deionized water; stirring; adding sodium stannate or potassium stannate with the molar weight as the sum of lanthanum stannate and europium stannate in the solution; stirring; putting terminal solution into high-pressure autoclave; setting the filling density at 80-90%; disposing for 4-30h within 180-250 deg.c through hot water; centrifuging the disposed solution; cleaning; drying the product; obtaining the product with diameter at 15-35nm. The molecular formula of the product is La2-xEuxSn2O7 (x=02), which produces single and one-phase product.

Description

technical field [0001] The invention relates to a method for synthesizing lanthanum stannate, europium stannate and composite stannate nanopowder. Background technique [0002] Pyrochlore-type oxides are a series of molecular formula A 2 B 2 o 7 The oxygen-containing compound, wherein A is a divalent or trivalent cation, and B is a tetravalent or pentavalent cation. Due to their excellent thermal, electrical, magnetic and catalytic properties, these compounds have been receiving special attention. Rare earth stannate is an important class of pyrochlore-type oxides, the molecular formula is RE 2 sn 2 o 7 (RE=Y, La-Lu). Recent studies have shown that rare earth stannates have potential applications in lithium batteries, catalysis, photoluminescence, ion conductors, and radiation protection. Due to the high melting point of rare earth stannates (>2000°C), they can be used as high-temperature catalysts and have unique applications in the treatment and control of autom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00C01G19/00
Inventor 祝洪良朱鲁明于桂霞姚奎鸿席珍强
Owner ZHEJIANG SCI-TECH UNIV
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