Synthesis method and application of size-controlled low-dimensional strontium titanate crystals

A synthesis method, the technology of strontium titanate, applied in the direction of titanate, titanium compound, alkali metal titanate, etc., can solve the problems of high content of impurity atoms, excessive particle size, narrow controllable range, etc., and achieve the goal of equipment The effect of low requirements, simple preparation process and short production cycle

Active Publication Date: 2018-06-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of flaky SrTiO prepared by the existing preparation process. 3 The crystal has too large a particle size and a relatively narrow adjustable range, the crystal is a polycrystalline aggregate, and the content of impurity atoms in the crystal is high, resulting in problems such as narrow range, poor stability, low degree of orientation, and performance deterioration in its application. To provide a synthesis method and application of a size-controllable low-dimensional strontium titanate crystal

Method used

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  • Synthesis method and application of size-controlled low-dimensional strontium titanate crystals
  • Synthesis method and application of size-controlled low-dimensional strontium titanate crystals
  • Synthesis method and application of size-controlled low-dimensional strontium titanate crystals

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specific Embodiment approach 1

[0042] Specific Embodiment 1: This embodiment is a method for synthesizing a size-controllable low-dimensional strontium titanate crystal, which is completed in the following steps:

[0043] 1. TiO 2 Powder and Bi 2 o 3 Mix the powders, and then add molten salt to obtain mixture Ⅰ; use absolute ethanol as the ball milling medium, use zirconia balls as the balls, mill the mixture Ⅰ at a ball milling speed of 60r / min-240r / min, and bake the mixture after ball milling Dry the slurry to obtain the mixed raw material I;

[0044] TiO as described in step 1 2 Powder and Bi 2 o 3 The molar ratio of powder is 3:(1.3~3);

[0045] TiO as described in step 1 2 The particle size of the powder is ≤100nm;

[0046] The molten salt described in step 1 is Na 2 SO 4 、K2 SO 4 , one of NaCl and KCl or a mixture of several of them;

[0047] TiO as described in step 1 2 Powder and Bi 2 o 3 The mass ratio of the total mass of the powder to the molten salt is 1:(0.5~15);

[0048] 2. Put...

specific Embodiment approach 2

[0070] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the ball milling time in step 1 is 4h-72h. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0071] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the heating rate of the high-temperature furnace in step 2 is 0.1° C. / min to 15° C. / min. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a synthesis method and an application of size-controlled low-dimensional strontium titanate crystals, relates to a synthesis method and an application of strontium titanate crystals, and aims to solve the problems that plate SrTiO3 crystals prepared by an existing preparation process are excessive in particle size, narrow in controllable range and provided with polycrystalline aggregates, and narrow range, poor stability, low orientation degree and deteriorated performance in applications of the crystals are caused by impurity atoms in the crystals. The method includesthe steps: firstly, preparing precursor mixing raw materials; secondly, calcining the raw materials to prepare a precursor; thirdly, cleaning and dispersing the precursor to obtain a size-controlled plate Bi4Ti3O12 precursor with uniform particle size; fourthly, performing product mixing raw materials; fifthly, calcining the raw materials to prepare a product; sixthly, cleaning the product. The crystals are used for the field of preparation of photocatalysis, nano-devices, organic filler and energy storage, high-performance multifunctional electronic texture ceramics, thin films and mono-crystals. According to the method, the size-controlled low-dimensional strontium titanate crystals can be acquired.

Description

technical field [0001] The invention relates to a synthesis method and application of strontium titanate crystal. Background technique [0002] Strontium titanate (SrTiO 3 ) is a very unique multifunctional material, which has the advantages of photocatalysis, microwave dielectric tunability, high dielectric constant, remarkable piezoelectricity, good semiconductivity, and good temperature stability. Catalysis, solar cell electrodes, oxygen conduction, energy storage, electronic components and other fields have been widely used. With the development of micro-nano technology, device applications are moving toward miniaturization, integration, and high functionality, which makes three-dimensional SrTiO 3 Crystals have been difficult to meet the requirements of the new generation of components, and the synthesis of low-dimensional crystals with nano-micron dimensions has become an inevitable development. Two-dimensional flake SrTiO 3 Due to the anisotropic morphology, the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B82Y40/00
CPCB82Y40/00C01G23/005C01P2002/34C01P2002/72C01P2004/01C01P2004/03
Inventor 常云飞吴杰孙媛刘迎春杨彬曹文武
Owner HARBIN INST OF TECH
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