Quasi-cubic bismuth lanthanum titanate (BLT) nanoparticles and preparation method thereof

A bismuth lanthanum titanate and morphology technology is applied in the field of bismuth lanthanum titanate ferroelectric nano-single crystal particles and their preparation, which can solve the problems of high synthesis temperature, severe mutual adhesion, coarse product crystal grains and the like, and achieves simple preparation equipment. , the effect of easy control of the process

Inactive Publication Date: 2011-06-15
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the research on BLT is currently mainly focused on the preparation and properties of thin film materials, and there are few reports on the preparation, self-assembly, and ordered microstructure and properties of nanocrystals.
The literature shows that the BLT powder with the required composition can be synthesized by the solid-state reaction method using metal oxides as raw materials, but the synthesis temperature is high, the product grains are coarse, the shape is irregular, and the mutual adhesion is serious, which cannot be applied to the array structure. Self-Assembly Research
On the other hand, although liquid-phase chemical methods including Sol-Gel method, co-precipitation method, hydrothermal method and molten salt method are also widely used in the synthesis of BLT oxide nanocrystals, it may be due to the uniqueness of BLT. Due to the structural characteristics of layered perovskite, there are few reports in the literature that bismuth lanthanum titanate nanocrystals with regular morphology have been synthesized, but the morphology is mainly thin in the c-axis direction, and there is a small amount of pyrochlore facies

Method used

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  • Quasi-cubic bismuth lanthanum titanate (BLT) nanoparticles and preparation method thereof
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  • Quasi-cubic bismuth lanthanum titanate (BLT) nanoparticles and preparation method thereof

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Embodiment 1

[0031] Utilize the method provided by the invention, prepare chemical composition to be Bi 3.25 La 0.75 Ti 3 o 12 quasi-square nanocrystals. The operation steps are as follows:

[0032] A. At a stirring speed of 200rpm, add 1.02ml of C 16 h 36 o 4 Ti, the dropping rate is 0.2ml / min, forming amorphous hydrated titanium dioxide gel; 2 Wash with deionized water for 5 times until the pH of the washing solution is 7.0; gel centrifugation is carried out at a speed of 8000 rpm for 10 min; add H to the titanium dioxide wet gel obtained after washing 2 o 2 (30wt%) 0.35ml, a yellow precipitate was obtained, and HNO was added dropwise 3 (66wt%) 0.6395g, obtain wine red transparent TiO(NO 3 ) 2 solution.

[0033] B. According to Bi 3.25 La 0.75 Ti 3 o 12 Nanocrystalline stoichiometric requirements, weigh Bi 2 o 3 0.7572g, La 2 o 3 0.1222g dissolved in 1.02ml HNO 3 (66wt%) in 1.68ml water, stir 15min to obtain colorless transparent bismuth lanthanum nitrate aqueous sol...

Embodiment 2

[0039] Utilize the method provided by the invention, prepare chemical composition to be Bi 3.5 La 0.5 Ti 3 o 12 quasi-cubic nanocrystals. The operation steps are as follows:

[0040] A. At a stirring speed of 180rpm, add 1.02ml of C 16 h 36 o 4 Ti, the dropping rate is 0.4ml / min, forming amorphous hydrated titanium dioxide gel; 2 Wash with deionized water for 5 times, and the pH of the washing solution is 7.3; the gel centrifugation is carried out at a speed of 7000rpm, and the time is 12min; add H 2 o 2 (30wt%) 0.39ml, obtain bright yellow precipitate, continue to drop HNO 3 (66wt%) 0.7123g, obtain wine red transparent TiO(NO 3 ) 2 solution.

[0041] B. According to Bi 3.5 La 0.5 Ti 3 o 12 Nanocrystalline stoichiometric requirements, weigh Bi 2 o 3 0.7067g, La 2 o 3 0.2444g dissolved in 1.14ml HNO 3 (66wt%) in 1.85ml water, stir 20min to obtain colorless transparent bismuth lanthanum nitrate aqueous solution, the wine red transparent TiO(NO 3 ) 2 The so...

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Abstract

The invention discloses quasi-cubic bismuth lanthanum titanate (BLT) ferroelectric single crystal nanoparticles and a preparation method thereof. The nanoparticles and the preparation method have important application values for self-assembly of ferroelectric ordered nano-array structures. The technical scheme adopted by the invention is as follows: taking analytically pure Bi2O3, La2O3 and Cl6H36O4Ti as raw materials, cyclohexane as oil phase, Triton X-100 as a surfactant and n-butyl alcohol as a cosurfactant to form colloidal particles with chemical composition being Bi4-xLaxTi3O12 (x=0.5-1.0) through reverse microemulsion process, synthesizing BLT coarse nanocrystals through thermal treatment at the temperature of 450-750 DEG C, further putting the obtained BLT coarse nanocrystals intosodium carbonate / lithium carbonate mixed molten salt and obtaining the quasi-cubic BLT nanocrystals with uniform dimensions through melting-nucleation-growth. The microstructure characteristic of theBLT nanocrystals has not been publicly reported internationally so far.

Description

Technical field: [0001] The invention belongs to the field of nanomaterials, and relates to a bismuth lanthanum titanate ferroelectric nano single crystal particle with a regular quasi-cubic shape and a preparation method thereof, which is important for the self-assembly of a planar nano-ordered array structure of an ultra-high-density ferroelectric memory Value. Background technique: [0002] In recent years, with the rapid development of information science and technology, the information capacity is increasing day by day, and higher and higher requirements are put forward for the storage density of the memory. The current ferroelectric memory is developing towards high density and high integration. Density up to ~10Gbit / in 2 The non-volatile ferroelectric memory has become an inevitable trend in the development of this field. Especially with the deepening of people's understanding of the "size effect" extrinsic behavior of ferroelectrics, and because ferroelectrics have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/626
Inventor 曾燕伟杨晓伟
Owner NANJING TECH UNIV
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