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Single-phase samarium titanate nanopowder prepared by a solution method and method thereof

A nano-powder, samarium titanate technology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science

Active Publication Date: 2019-10-22
成都莒纳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the preparation of pure phase Sm 2 Ti 2 o 7 Nanopowder has not been reported yet

Method used

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  • Single-phase samarium titanate nanopowder prepared by a solution method and method thereof
  • Single-phase samarium titanate nanopowder prepared by a solution method and method thereof
  • Single-phase samarium titanate nanopowder prepared by a solution method and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve samarium nitrate and tetrabutyl titanate in 10 ml of acetic acid at a molar ratio of 1:1.2, and stir magnetically in a water bath to form a transparent solution; adjust the temperature of the water bath to 10°C, and slowly add ammonia water to the transparent In the solution, produce milky white product in the solution, continue to add ammoniacal liquor until the pH value of whole system is neutral, completes reaction. Subsequently, the reacted solution was subjected to solid-liquid separation with a centrifuge at a centrifugation rate of 8000 rpm to obtain a white powder. The white powder was dried at 80°C for 2 hours, then transferred to a muffle furnace, and calcined at 800°C for 1 hour to obtain a light yellow Sm 2 Ti 2 o 7 Nano powder.

[0035] Such as figure 1 As shown, the obtained powder is scanned between 10-70 degrees by X-ray diffractometer, and the powder sample shows polycrystalline diffraction characteristics, and all diffraction peaks and Sm ...

Embodiment 2

[0037] Dissolve samarium nitrate and tetrabutyl titanate in 10 ml of acetic acid at a molar ratio of 1:1.1, and stir magnetically in a water bath to form a transparent solution; adjust the temperature of the water bath to 4°C, and slowly add ammonia water to the transparent In the solution, produce milky white product in the solution, continue to add ammoniacal liquor until the pH value of whole system is neutral, completes reaction. Subsequently, the reacted solution was subjected to solid-liquid separation with a centrifuge at a centrifugation rate of 10,000 rpm to obtain a white powder. The white powder was dried at 80°C for 2 hours, then transferred to a muffle furnace, and calcined at 750°C for 2 hours to obtain light yellow Sm 2 Ti 2 o 7 Nano powder. The grain size obtained by calculating the half width of the diffraction peak is 35 nm.

[0038] figure 2 Given the obtained Sm 2 Ti 2 o 7 The absorption spectra of nanopowders for organic dye rhodamine after differ...

Embodiment 3

[0040] Dissolve samarium nitrate and tetrabutyl titanate in 10 ml of acetic acid at a molar ratio of 1:1.3, and stir magnetically in a water bath to form a transparent solution; adjust the temperature of the water bath to 25°C, and slowly add ammonia water to the transparent In the solution, produce milky white product in the solution, continue to add ammoniacal liquor until the pH value of whole system is neutral, completes reaction. Subsequently, the reacted solution was subjected to solid-liquid separation with a centrifuge at a centrifugation rate of 6000 rpm to obtain a white powder. The white powder was dried at 80°C for 2 hours, then transferred to a muffle furnace, and calcined at 850°C for 4 hours to obtain a light yellow Sm 2 Ti 2 o 7 Nano powder. The grain size obtained by calculating the half width of the diffraction peak is 45 nm.

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Abstract

The invention relates to a single-phase samarium titanate nanopowder prepared by a solution method and a method thereof. First, the samarium source and the titanium source are dispersed in a solvent according to a molar ratio of 1: (1.1 to 1.3) to obtain solution A; solution A is adjusted to neutral pH value to obtain a milky white mixed solution B; separate the milky white mixed solution B to obtain a white powder; dry the powder obtained in step three and then calcine to obtain single-phase samarium titanate nanopowder . In the present invention, the samarium source and titanium source are fully dissolved and dispersed in the solvent medium, and the samarium source and titanium source are mixed and reacted at the atomic scale to achieve precise control of the chemistry between the ternary Sm-Ti-O chemical elements. The purpose of the stoichiometric ratio is to prevent the appearance of other impurities and achieve the preparation of single-phase Sm 2 Ti 2 O 7 The goal.

Description

technical field [0001] The invention belongs to the field of nano-powder materials, and in particular relates to a single-phase samarium titanate nano-powder prepared by a solution method and a method thereof. Background technique [0002] Ternary Sm 2 Ti 2 o 7 The compound has two lattice structures, one is the cubic pyrochlore structure, which belongs to the Fd-3m(227) space point group, and the lattice constant is a=10.2331 angstroms; the other is the orthorhombic crystal system, which belongs to the Cmc21(36 ) space point group, the lattice constants are a=3.8062 angstroms, b=25.6942 angstroms, c=5.419 angstroms. ZhenMian Shao prepared Sm using a sol-gel method 2 Ti 2 o 7 Thin film, found that it has ferroelectric properties in the metastable state (ZhenMian Shao, SebastienSaitzek, Anthony Ferri et al, Evidence of ferroelectricity in metastableSm 2 Ti 2 o 7 thin film [J], Journal of Materials Chemistry, 2012, 22(19):9806-9812). SM 2 Ti 2 o 7 Thin films are a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00B01J23/10B82Y30/00
CPCB82Y30/00C01G23/003B01J23/10C01P2002/36C01P2002/72B01J35/39
Inventor 葛万银徐美美申国栋朱建锋叶晓慧张荔常哲焦思怡
Owner 成都莒纳新材料科技有限公司
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