Universal synthesizing method for lanthanide series rare earth stannate nano powder

A technology of lanthanide rare earths and nanopowders, which is applied in the direction of rare earth metal compounds, tin compounds, nanotechnology, etc., can solve the problems of large particle size, high energy consumption, and poor product dispersion, so as to reduce energy consumption, simplify the process, The effect of high purity

Inactive Publication Date: 2007-09-26
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the solid-state reaction method requires long-term high-temperature treatment, the energy consumption is large, the product dispersion is poor, and the particle size is large

Method used

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  • Universal synthesizing method for lanthanide series rare earth stannate nano powder
  • Universal synthesizing method for lanthanide series rare earth stannate nano powder
  • Universal synthesizing method for lanthanide series rare earth stannate nano powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 0.694 grams of hydrated cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O) be dissolved in 160 milliliters of water, the molar concentration of cerium nitrate is 0.01 mol / liter, stir. Add 0.427 gram of sodium stannate hydrate (Na 2 SnO 3 ·3H 2 (0), the molar concentration of sodium stannate 0.01 mol / liter, fully stirred. The above prepared solution is put into the polytetrafluoroethylene lining of the autoclave, the volume of the lining is 200 milliliters, and the filling degree is controlled to be 80%. The solution was treated at 180°C for 48 hours, and the treated solution was centrifuged and dried to obtain cerium stannate nanopowder with the chemical formula Ce 2 sn 2 o 7 . Figure 1 is the XRD spectrum of the product. All the diffraction peaks in Figure 1 are in perfect agreement with the standard sample card of cerium stannate (JCPDS no.48-0640), indicating that the product is a well-crystallized pyrochlore-type cerium stannate. Fig. 2 is a transmission electron microg...

Embodiment 2

[0031] 2.088 grams of hydrated praseodymium nitrate (Pr(NO 3 ) 3 ·6H 2 O) be dissolved in 160 milliliters of water, the molar concentration of praseodymium nitrate is 0.03 mol / liter, stir. Add 1.281 grams of sodium stannate hydrate (Na 2 SnO 3 ·3H 2(0), the molar concentration of sodium stannate 0.03 mol / liter, fully stirred. Put the above prepared solution into the polytetrafluoroethylene lining of the autoclave, the volume of the lining is 200 milliliters, and the control filling degree is 90%. The solution was treated at 200°C for 100 hours, and the treated solution was centrifuged and dried to obtain praseodymium stannate nanopowder, the chemical formula is Pr 2 sn 2 o 7 . Figure 3 is the XRD pattern of the product. All the diffraction peaks in Figure 3 are in perfect agreement with the standard sample card of praseodymium stannate (JCPDS no.13-0184), indicating that the product is pyrochlore-type praseodymium stannate with good crystallization. Fig. 4 is a trans...

Embodiment 3

[0033] 2.102 grams of hydrated neodymium nitrate (Nd(NO 3 ) 3 ·6H 2 O) be dissolved in 160 milliliters of water, the molar concentration of neodymium nitrate is 0.03 mol / liter, stir. Add 1.281 grams of sodium stannate hydrate (Na 2 SnO 3 ·3H 2 (0), the molar concentration of sodium stannate 0.03 mol / liter, fully stirred. The above prepared solution is put into the polytetrafluoroethylene lining of the autoclave, the volume of the lining is 200 milliliters, and the filling degree is controlled to be 80%. Treat the solution at 200°C for 10 hours, centrifuge and dry the treated solution to obtain neodymium stannate nanopowder, the chemical formula is Nd 2 sn 2 o 7 . Figure 5 is the XRD pattern of the product. All the diffraction peaks in Figure 5 are in perfect agreement with the standard sample card of neodymium stannate (JCPDS no.13-0185), indicating that the product is a pyrochlore-type neodymium stannate with good crystallization. Fig. 6 is a transmission electron m...

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Abstract

The invention discloses a general purpose synthesized method of lanthanide series rare earth stannate nanometer power, which comprises the following steps: dissolving lanthanide series rare earth nitrate (Ln(NO3)3, Ln=La-Lu) into deionized water; adding sodium stannate or potassium stannate with the same mole number; stirring; putting the final solution into autoclave; setting filling degree at 80-90%; water- annealing 4-100 h during the range of 180-250 deg.c; centrifuging and drying the treated solution at last; getting the product.

Description

technical field [0001] The invention relates to a general synthesis method of lanthanide rare earth stannate nanopowder. Background technique [0002] Pyrochlore-type oxides are a class of compounds with similar structures, and their molecular formula can be expressed as A 2 B 2 o 7 , wherein A is a divalent or trivalent cation, and B is a tetravalent or pentavalent cation. Pyrochlore-type oxides have attracted worldwide attention due to their excellent thermal, electrical, magnetic, and catalytic properties. Rare earth stannate is a pyrochlore-type oxide composed of trivalent rare earth ions and tetravalent tin ions, and its chemical formula is Ln 2 sn 2 o 7 (Ln=Y or La-Lu). Rare earth stannates are high-melting ceramics (melting point>2000°C), so they can be used as unique high-temperature catalysts (such as automobile exhaust gas treatment, etc.). At the same time, rare earth stannates can also be used as good luminescent materials (Z. Lu et al. J. Solid State ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/00C01F17/00B82B3/00
Inventor 祝洪良朱鲁明杨红姚奎鸿金达莱席珍强
Owner ZHEJIANG SCI-TECH UNIV
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