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a sm 2 o 3 Preparation method of nanocrystal

A nanocrystal and reaction technology, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, rare earth metal compounds, etc., can solve the problem of high heat treatment temperature, achieve high purity, low production cost, and good industrialization prospects Effect

Inactive Publication Date: 2017-04-26
SHANGLUO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has been reported that the prepared Sm 2 o 3 It is a mixed phase of cubic phase and monoclinic phase, and the heat treatment temperature is higher (800°C)

Method used

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  • a sm <sub>2</sub> o <sub>3</sub> Preparation method of nanocrystal
  • a sm <sub>2</sub> o <sub>3</sub> Preparation method of nanocrystal

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preparation example Construction

[0027] The preparation method of the present invention comprises the following steps:

[0028] 1) A certain amount of analytically pure Sm(NO 3 ) 3 ·6H 2 O was dissolved in appropriate amount of distilled water to make Sm 3+ The concentration is 0.02~0.06mol·L -1 Samarium nitrate solution;

[0029] 2) A certain amount of analytically pure CO(NH 2 ) 2 Dissolved in appropriate amount of distilled water for alkali source to make concentration 0.01~0.03mol L -1 urea solution;

[0030] 3) Mix equal volumes of samarium nitrate solution and urea solution under magnetic stirring to form a reaction precursor, because the two are mixed in equal volumes, therefore, Sm(NO 3 ) 3 and CO(NH 2 ) 2 The molar ratio is (0.02~0.06):(0.01~0.03);

[0031]4) Pour the above-mentioned reaction precursor solution into an ordinary hydrothermal kettle, control the filling degree of the reaction precursor solution in the hydrothermal kettle to be 60% to 80%, seal the hydrothermal kettle, put i...

Embodiment 1

[0036] 1) A certain amount of analytically pure Sm(NO 3 ) 3 ·6H 2 O was dissolved in appropriate amount of distilled water to make Sm 3+ The concentration is 0.02mol·L -1 solution A;

[0037] 2) A certain amount of analytically pure CO(NH 2 ) 2 Dissolved in an appropriate amount of distilled water to make a concentration of 0.01mol L -1 Solution B of

[0038] 3) Mix equal volumes of solution A and solution B under magnetic stirring to form a reaction precursor;

[0039] 4) Pour the above-mentioned reaction precursor solution into an ordinary hydrothermal kettle, control the filling degree at 80%, seal the hydrothermal kettle, put it into an electric drying oven, and react at 160°C for 16 hours, and naturally cool to room temperature after the reaction;

[0040] 5) The product was sequentially washed with distilled water and absolute ethanol for 4 times, and dried in an electric oven at 60° C. for 4 hours to obtain the precursor.

[0041] 6) Calcinate the obtained prec...

Embodiment 2

[0043] 1) A certain amount of analytically pure Sm(NO 3 ) 3 ·6H 2 O was dissolved in appropriate amount of distilled water to make Sm 3+ The concentration is 0.04mol L -1 solution A;

[0044] 2) A certain amount of analytically pure CO(NH 2 ) 2 Dissolved in an appropriate amount of distilled water to make a concentration of 0.02mol L -1 Solution B of

[0045] 3) Mix equal volumes of solution A and solution B under magnetic stirring to form a reaction precursor;

[0046] 4) Pour the above-mentioned reaction precursor solution into an ordinary hydrothermal kettle, control the filling degree at 70%, seal the hydrothermal kettle, put it into an electric drying oven, and react at 140°C for 18 hours, and naturally cool to room temperature after the reaction;

[0047] 5) The hydrothermal product was sequentially washed with distilled water and absolute ethanol four times, and dried in an electric drying oven at 70° C. for 3 hours to obtain the precursor.

[0048] 6) Calcinat...

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Abstract

The invention relates to a preparing method for Sm2O3 nanocrystalline. The preparing method includes the steps that a Sm(NO3)3 solution and a CO(NH2)2 solution are mixed uniformly to form a reaction precursor solution, wherein the molar ratio of Sm(NO3)3 to CO(NH2)2 is (0.02-0.06):(0.01-0.03); the reaction precursor solution reacts at the temperature of 120-180 DEG C to generate precipitate, and the reaction product is naturally cooled to the room temperature after reaction is finished; the precipitate is separated, washed and dried to obtain a precursor; the precursor is calcined at the temperature of 450-600 DEG C for 1-2 h to obtain the Sm2O3 nanocrystalline. Sm(NO3)3 is used as a samarium source, CO(NH2)2 is used as an alkali source, pure cubic-phase spherical Sm2O3 nanocrystalline is prepared at the low heat treatment temperature of 450-600 DEG C through a hydrothermal-heat treatment method, energy consumption is low, and surfactant for controlling morphology is not needed. The obtained Sm2O3 nanocrystalline is high in purity and crystallinity, uniform in size distribution and good in dispersity.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of nanomaterial preparation, in particular to a Sm 2 o 3 Methods of preparing nanocrystals. [0003] 【Background technique】 [0004] Rare earth elements have 4f x 5d 0-1 6s 2 The electronic structure of rare earth metals has strong activity because of its large atomic radius and easy loss of 6s, 5d or 4f electrons in the outer layer, which makes rare earth metals and their compounds exhibit typical optical, electrical, magnetic and catalytic properties. Introduce specific nano-manufacturing technology into the preparation process of functional rare earth materials, so that the advantages of rare earth materials can be combined with the characteristics of nano-materials. The application of phosphors and varistors is not only expected to realize the upgrading of traditional industries, but also will promote the value-added utilization of rare earth materials and further exert the advantages of rare earth res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
CPCC01F17/206C01P2002/72C01P2004/03C01P2004/32C01P2004/62C01P2006/80
Inventor 李凯斌石启英周春生王书民崔孝炜张国春任有良南宁
Owner SHANGLUO UNIV
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