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Strontium titanate submicron crystal and preparation method thereof

A strontium titanate submicron and strontium submicron technology, which is applied in the field of material chemistry, can solve the problems of large strontium titanate crystal particle size, harsh preparation conditions, uneven particles, etc., and achieves good crystal morphology and fast energy transfer rate. , the effect of small and uniform particle size

Inactive Publication Date: 2013-12-18
SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a submicron crystal of strontium titanate, which aims to solve the problem of large particle size and uneven particle size of the strontium titanate crystal prepared in the prior art
[0006] Another purpose of the embodiments of the present invention is to provide a method for preparing strontium titanate submicron crystals, which aims to solve the problems of harsh preparation conditions and low product purity in the prior art

Method used

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  • Strontium titanate submicron crystal and preparation method thereof
  • Strontium titanate submicron crystal and preparation method thereof
  • Strontium titanate submicron crystal and preparation method thereof

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preparation example Construction

[0029] Correspondingly, the embodiment of the present invention also provides a method for preparing strontium titanate submicron crystals, the process flow chart of the preparation method is as follows figure 1 As shown, it includes the following steps:

[0030] 1) SrO 2 with TiO 2 The mixture is thermally reacted at 650-750°C for 9-10.5 hours in a molten salt medium;

[0031] 2) Purify and dry the thermal reaction product to obtain SrTiO 3 submicron crystals.

[0032] In the above step 1), the TiO 2 Is a thermally stable compound, difficult to remove from the product. And the SrO 2 It is a thermally unstable compound that will completely decompose into SrO and O at the reaction temperature 2 , the newly decomposed SrO has high reactivity and can quickly react with TiO 2 react. Therefore, in order to avoid the reactant TiO 2 The problem that the impurity caused by the excess is difficult to remove, often puts an excessive amount of reactant SrO in the reaction syste...

Embodiment 1

[0053] 1. SrO 2 preparation of

[0054] Weigh 1.0582 (0.005mol) of Sr(NO 3 ) 2 Put into a 100mL beaker, add 30ml H 2 o 2 (30%, v / v), stirred until completely dissolved, added dropwise ammonia water to adjust pH = 8, then allowed the reaction solution to stand at room temperature for 30 min, filtered it with suction, washed several times with deionized water and ethanol respectively, and put it in the air Dry at room temperature to obtain SrO 2 .

[0055] 2. Synthesis of SrTiO by low temperature molten salt reaction method 3 submicron crystals.

[0056] Take SrO 2 Particles (0.005mol, about 0.5981g), TiO 2 Granules (0.004mol, about 0.3196g) and sodium chloride / potassium chloride (1:1, w / w) mixed molten salt 0.5g, mixed and ground for 8min with an agate mortar, the above mixture was placed in a horse React in a furnace at 700°C for 10 hours. The speed of the muffle furnace is 14°C / min to increase to the specified temperature of 700°C. After the reaction is completed, ...

Embodiment 2

[0063] 1. Synthesis of SrTiO by low temperature molten salt reaction method 3 submicron crystals

[0064] Take SrO 2 Particles (0.005mol, about 0.5981g), TiO prepared in Example 1 2 Granules (0.004mol, about 0.3196g) and sodium chloride / potassium chloride (1:1, w / w) mixed molten salt 1.0g, mixed and ground with an agate mortar for 8min, the above mixture was placed in a horse React in a furnace at 700°C for 10 hours. The speed of the muffle furnace is 14°C / min to increase to the specified temperature of 700°C. After the reaction is completed, it is naturally cooled to room temperature. Wash the product thoroughly with 1mol / L nitric acid and deionized water, respectively, to remove SrCO 3 impurities and other soluble salts, the washed product was dried in air at 80°C to obtain white SrTiO 3 submicron crystals.

[0065] 2. Product SrTiO 3 The quality inspection is modified according to embodiment 1

[0066] 2.1 The product SrTiO obtained by low temperature molten salt me...

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Abstract

The invention is suitable for the material chemical field, and provides a strontium titanate submicron crystal and a preparation method thereof. The strontium titanate submicron crystal is characterized in that the shape of the strontium titanate submicron crystal is a cubic-phase crystal, and the dimension is within 100nm-350nm, and reaches submicron level. The preparation method of the strontium titanate submicron crystal mainly comprises the following steps: (1), carrying out thermal reaction on a mixture of SrO2 and TiO2 for 9-10.5 hours in a molten salt medium at 650 DEGC-750 DEG C; (2), purifying and drying the thermal reaction product to obtain the SrTiO3 submicron crystal. Compared with the prior art, the preparation method is low in reaction system temperature, complete in reaction, simple in process operation and short in period; and the strontium titanate submicron crystal obtained by process synthesis is high in purity, fine and uniform in grain size which reaches the submicron level.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a strontium titanate submicron crystal and a preparation method thereof. Background technique [0002] Strontium titanate (SrTiO 3 ) is a composite oxide with a typical perovskite structure. At room temperature, the strontium titanate crystal that satisfies the stoichiometric ratio is an insulator, but it can be semiconducted under the condition of forced reduction or doping of donor metal ions. Strontium titanate is a widely used electronic functional ceramic material. It has the advantages of high dielectric constant, low dielectric loss and good thermal stability. It is widely used in electronics, machinery and ceramic industries. At the same time, as a functional material, strontium titanate has the characteristics of high band gap (3.4eV), excellent photocatalytic activity, etc., and has unique electromagnetic properties and redox catalytic activity. Photocata...

Claims

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Application Information

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IPC IPC(8): C01G23/00
Inventor 刘白刘力睿
Owner SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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