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Directionally grown flaky SrTiO3 and its preparing process

A directional growth and flaky technology, applied in chemical instruments and methods, inorganic chemistry, titanium compounds, etc., can solve the problem that there are no related patents for flaky SrTiO3

Inactive Publication Date: 2004-08-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the molten salt method has been widely used in the world to obtain different types of piezoelectric materials, but it is used to obtain oriented growth flake SrTiO 3 No relevant patent yet

Method used

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  • Directionally grown flaky SrTiO3 and its preparing process
  • Directionally grown flaky SrTiO3 and its preparing process
  • Directionally grown flaky SrTiO3 and its preparing process

Examples

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Embodiment 1

[0014] by SrCO 3 :TiO 2 =3.2: 2.0 molar ratio weighing, ball milling and mixing in ethanol liquid for 8 hours, then the mixture of fluxing agent NaCl and KCl was added in the slurry by 50wt% of dry matter, mixed and dried, and the obtained powder was mixed at 1300 After 4 hours of heat preservation at ℃, cool with the furnace and wash to obtain the precursor powder Sr 3 Ti 2 o 7 , the Sr 3 Ti 2 o 7 with TiO 2 Weigh and mix in ethanol liquid according to the molar ratio of 1:1.2, stir gently for 30 minutes, add the mixture of flux NaCl and KCl into the slurry according to 50wt% of the dry material, and keep the powder at 1200°C for 4 Hours, cooled with the furnace to get SrTiO 3 product, its scanning electron microscope photo is shown in figure 1 .

[0015] Depend on figure 1 It can be seen that the SrTiO obtained by the molten salt method of the present invention 3 The powder particles are flaky, with a length and width of 10-40 μm and a thickness of 2-5 μm.

[00...

Embodiment 2

[0018] by SrCO 3 :TiO 2 = 2.7: 2.0 molar ratio weighing, ball milling and mixing in ethanol liquid for 8 hours, then adding flux KCl to the slurry according to 55wt% of the dry weight, mixing and drying, and keeping the obtained powder at 1300°C for 4 hours , cooled with the furnace, and the precursor powder Sr was obtained after washing 3 Ti 2 o 7 , the Sr 3 Ti 2 o 7 with TiO 2 According to the molar ratio of 1:0.7, mix in the ethanol solution, stir gently for 30 minutes, add the flux KCl into the slurry according to 55wt% of the dry material, and after drying, the powder is kept at 1200°C for 3 hours. cooling, that is the required SrTiO 3 , its SEM morphology and that of Example 1 figure 1 same. For oriented growth flake SrTiO 3 , 10-40 μm in length and width, and 2-5 μm in thickness.

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Abstract

A directional grown flaky SrTiO3 length and width is not less than 10 micron m and thickness 0.5-6 micron m is prepared through synthesizing flaky precursor Sr3Ti2O7 from KCl or NaCl and KCl by fused-salt process and growing SiTiO3 on the interface of flaky Sr3Ti2O7 crystal. The product has obvious flaky structure with directionally grown surfaces.

Description

technical field [0001] The present invention relates to oriented growth flake SrTiO 3 and its preparation method. Background technique [0002] SrTiO 3 It is a typical representative of perovskite multifunctional ceramics. It has the characteristics of high dielectric constant and low dielectric loss. It has been applied and researched in grain boundary capacitors, microwaves, and sensitive components. With the development and application of microelectronics technology, the miniaturization, multi-function, high reliability and high sensitivity of electronic components are required, and the traditional raw material technology is obviously unable to adapt. At the same time, in order to obtain lead-based relaxor ferroelectric materials with good piezoelectric performance, high strength and low cost, it is necessary to obtain sheet-shaped lead-based relaxor ferroelectric materials through directional growth, such as lead magnesium niobate-lead titanate (referred to as PMNT), ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00C04B35/468C04B35/622C04B35/653
Inventor 刘韩星赵青林孙晓琴欧阳世翕
Owner WUHAN UNIV OF TECH