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A kind of ultrafine titanate nanopowder and preparation method thereof

A nano-powder, titanate technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve problems such as growth and particle agglomeration, and achieve uniform particle size distribution, good dispersion, and strong operability. Effect

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

AI Technical Summary

Problems solved by technology

In summary, it is necessary to provide a new preparation method of titanate to avoid the problem of particle agglomeration and growth caused by the calcination process

Method used

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  • A kind of ultrafine titanate nanopowder and preparation method thereof
  • A kind of ultrafine titanate nanopowder and preparation method thereof
  • A kind of ultrafine titanate nanopowder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1, preparation average particle diameter is the barium titanate nanopowder of 2.8nm

[0042] Accurately weigh barium hydroxide octahydrate (Ba(OH) 2 ·8H 2O) 7.8868g (the molar ratio to tetrabutyl titanate is 1:1), polyethylene glycol (weight average molecular weight 3000) 0.58g (10% of the mass of theoretically synthesized barium titanate), tetrabutyl titanate Esters 8.54g (the molar concentration in diethylene glycol is 0.625mol / L), measure 40ml of diethylene glycol and place them in a three-necked bottle, add a reflux device, react at 160°C for 2 hours and then naturally Cool to room temperature. Add 10 times the volume of deionized water to the cooled sol, and centrifuge to obtain barium titanate precipitate. Then, the precipitated part of barium titanate was washed and centrifuged three times with absolute ethanol, and dried in an oven at 60°C to obtain completely crystallized nano barium titanate powder.

[0043] The XRD spectrum of the barium titana...

Embodiment 2

[0045] Embodiment 2, preparation 5nm barium titanate nanopowder

[0046] Accurately weigh barium hydroxide octahydrate (Ba(OH) 2 ·8H 2 O) 15.1428g (the molar ratio to tetrabutyl titanate is 1.2:1), polyacrylamide (weight average molecular weight 20000) 0.925g (10% of the mass of theoretically synthesized barium titanate), tetrabutyl titanate 13.675g (the molar concentration in triethylene glycol is 1.0mol / L), measure 40ml of triethylene glycol and place it in a three-necked bottle, add a reflux device, react at 190°C for 10 minutes, and then cool naturally to room temperature. Add deionized water 5 times the volume of the sol to the cooled sol, and centrifuge to obtain barium titanate precipitate. Then, the precipitated part was washed with absolute ethanol for 3 times, centrifuged and separated, and dried in an oven at 60°C to obtain completely crystallized nano barium titanate powder.

[0047] The XRD spectrum of the barium titanate nanopowder prepared in this embodiment...

Embodiment 3

[0049] Embodiment 3, preparation 6nm barium titanate nanopowder

[0050] The preparation method is the same as that of Example 2, except that the reaction solvent triethylene glycol is replaced by tetraethylene glycol.

[0051] The XRD spectrum of the barium titanate nanopowder prepared in this embodiment is shown in figure 1 (c), its transmission electron microscope (TEM) picture is as Figure 4 As shown, it can be seen that the average particle diameter of the barium titanate particles prepared in this example is 6 nm, and the size uniformity and dispersion are good.

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Abstract

The invention discloses an ultrafine titanate nano powder and a preparation method. The method comprises the following steps: 1) taking an alcohol compound as a solvent, under the existence condition of a surfactant, reacting tetrabutyl titanate and barium hydroxide octahydrate or / and strontium oxide octahydrate to obatain a titanate nanoparticles sol; 2) adding water in the titanate nanoparticles sol, centrifuging to obtain the titanate deposition, and drying the deposition to obtain the titanate nano powder. The method has the advantages of high efficiency and energy saving, simple process and safety, can realize large batch production method of the titanate nano powder; and the method has universality to preparing nano powder with various perovskite type structure. The prepared powder has small granularity, good dispersibility, large specific surface area, high dimension uniformity, high chemical activity and wide application of electronic ceramic and chemical catalysis.

Description

technical field [0001] The invention relates to an ultrafine titanate nanopowder and a preparation method thereof, belonging to the field of preparation of electronic ceramic powder materials. Background technique [0002] Titanate is an important electronic ceramic material with excellent dielectric, piezoelectric, ferroelectric and pyroelectric properties, and is widely used in various electronic components. Due to its high dielectric constant, low dielectric loss and good ferroelectric and piezoelectric properties, barium titanate is widely used to make multilayer ceramic capacitors, thermistors, ultrasonic detectors and various piezoelectric Electrical sensing devices. Strontium titanate has low dielectric loss, good thermal stability and excellent semiconductor properties. Barium strontium titanate has the characteristics of adjustable Curie temperature, high dielectric constant, low dielectric loss and high pyroelectric coefficient, and they are widely used in the el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00C04B35/468C04B35/47C04B35/626B82Y30/00
Inventor 王晓慧郝亚楠李龙土
Owner TSINGHUA UNIV
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