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Synthesis method of SrTiO3 heterogeneously coated BaTiO3 ultrafine nano-powder

A nano-powder, synthesis method technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of narrow particle size distribution, small particle size and high purity, and achieve improved Dielectric constant and piezoelectric constant, small particle size, good dispersion effect

Active Publication Date: 2016-09-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sol-gel method mostly uses techniques such as distillation or recrystallization to ensure the purity of the raw materials. It is not easy to introduce impurity particles in the process engineering. The resulting powder has small particle size, high purity, narrow particle size distribution, strong chemical activity, and can realize multiple The components are uniformly doped; however, the disadvantage is that the organic solvents used are mostly toxic

Method used

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  • Synthesis method of SrTiO3 heterogeneously coated BaTiO3 ultrafine nano-powder
  • Synthesis method of SrTiO3 heterogeneously coated BaTiO3 ultrafine nano-powder
  • Synthesis method of SrTiO3 heterogeneously coated BaTiO3 ultrafine nano-powder

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Embodiment 1

[0040] Such as figure 1 , 2 As shown, the BTO / STO heterojunction nanoparticles with Sr doping amount of 5% were prepared:

[0041] The total volume of the precursor solution prepared by the present invention is 28mL, wherein TiCl 4 The ethanol solution is 8mL, and the acetic acid solution containing Ba and Sr is 20mL. 0.4mL TiCl in ethanol solution 4 , the concentration of acetic acid solution is 1mol / L.

[0042] When the doping amount of Sr is 5%, the volume of solution A in the figure is 0.95 times of the total acetic acid solution, and 1.090g Ba(OH) needs to be added to 19mL acetic acid solution 2 ·8H 2 O. Then add the B solution in the figure into the A solution, and add 2g of granular NaOH, stir for 10min, and use the principle of NaOH dissolution and heat release to make BaTiO 3 The precursor solution is in an alkaline environment higher than room temperature, which is easy to form the internal core structure of the heterojunction. figure 1 The volume of solution...

Embodiment 2

[0044] Preparation of BTO / STO heterojunction nanoparticles with Sr doping amount of 10%:

[0045] Concrete operation step is with reference to embodiment 1, makes the volume ratio of the volume of A solution and C solution and total acetic acid solution be the doping ratio of corresponding substance respectively, the ratio of the total molar weight of Ba and Sr and the molar weight of Ti is 1 :1. Depend on Figure 4 It is the heterojunction TEM sample picture when the Sr doping amount is 10%. The result shows the shape of the core-shell structure cube, and the scale of the particles is at the nanometer level, indicating that the BTO-based heterogeneous coated nanoparticles The synthesis was successful.

Embodiment 3

[0047] Preparation of BTO / STO heterojunction nanoparticles with Sr doping amount of 20%:

[0048] Concrete operation step is with reference to embodiment 1, makes the volume ratio of the volume of A solution and C solution and total acetic acid solution be the doping ratio of corresponding substance respectively, the ratio of the total molar weight of Ba and Sr and the molar weight of Ti is 1 :1.

[0049] image 3 It is the XRD test result of the heterojunction with different Sr doping amounts. The single peak in the figure is the amplification result of the (110) crystal plane under different doping amounts. By enlarging the (110) crystal plane, it is confirmed that the diffraction peak has a drift phenomenon. It can be seen from the Bragg equation that the interplanar spacing of the crystal lattice decreases with the increase of the doping amount of Sr, thus confirming that the doping of Sr element is successful.

[0050] Figure 5 It is the heterojunction transmission el...

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Abstract

The invention discloses a synthesis method of SrTiO3 heterogeneously coated BaTiO3 ultrafine nano-powder. According to the invention, BaTiO3 nano-particles are synthesized with a sol precipitation method; SrTiO3 is subjected to secondary nucleation with a hydrothermal method, such that a coating layer is formed; and the SrTiO3 heterogeneously coated BaTiO3 ultrafine nano-powder is synthesized. With the method provided by the invention, the synthesized nano-particles have small particle size, good dispersion and a significant core-shell structure. Also, because BaTiO3 and SrTiO3 have different interplanar spacings, the two are subjected to lattice distortion at contact interface layers, such that the dielectric constant and piezoelectric constant of BaTiO3 are improved. With the change of the doping amount of Sr, the interplanar spacings of heterojunction show a regular change.

Description

technical field [0001] The present invention relates to a kind of SrTiO 3 Heterogeneous coated BaTiO 3 A method for synthesizing ultrafine nanopowder. Background technique [0002] BaTiO 3 (BTO) is an important ferroelectric material, mainly used to prepare positive temperature coefficient (PTC) thermistors, chip multilayer ceramic capacitors (MLCC), dynamic random access memory (DRAM), node amplifiers and optoelectronic components, etc. , Known as "the pillar of electronic ceramics". BaTiO 3 With a perovskite structure, from the surface to the interior near the Curie temperature, the crystal structure produces a transition from tetragonal to cubic phase. During this process, lattice distortion occurs at the interface of different phases. It is the existence of the lattice distortion layer that makes BaTiO 3 The dielectric constant increases substantially near the Curie temperature. Above the Curie temperature, BaTiO 3 Completely transform from tetragonal phase to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/628B82Y30/00
CPCB82Y30/00C04B35/468C04B35/62805
Inventor 党锋郎婧胡慧颖
Owner SHANDONG UNIV
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