Method for preparing BaTiO3 ceramic

A technology of ceramics and crystals, applied in the field of preparation and application of electronic ceramics, can solve the problems of cumbersome steps and long reaction time, and achieve the effect of simple process, simple method and short time consumption

Active Publication Date: 2016-07-20
SHANGQIU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hydrothermal method can obtain BTO crystals with relatively uniform particles, but the reaction raw materials are easily hydrolyzed to produce other products, which are easily mixed with CO in the air. 2 Combining with the growth of other heterogeneous phases, and the hydrothermal process requires high temperature and high pressure process, the reaction time is long (generally greater than 24 hours), and high temperature sintering is still required to obtain BTO ceramics, and the steps are relatively cumbersome

Method used

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  • Method for preparing BaTiO3 ceramic
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  • Method for preparing BaTiO3 ceramic

Examples

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Embodiment 1

[0021] A method for preparing BTO ceramics. The preparation method uses barium acetylacetonate and titanyl acetylacetonate as raw materials, and uses absolute ethanol as a solvent to obtain BTO crystal powder through low-temperature calcination, and obtain BTO through high-temperature sintering after tableting. Ceramics, specifically comprising the following steps:

[0022] (1) Weigh 0.01mol of Ba(acac) 2 and 0.01mol of TiO(acac) 2 , added to 10ml of absolute ethanol, stirred vigorously with a magnetic stirrer to obtain a mixed solution;

[0023] (2) drying the mixed solution at 80° C. for 15 hours to obtain a dry product;

[0024] (3) Fully grind the dried product, then raise the temperature to 500°C at a rate of 20°C / min, and keep it warm for 2 hours to obtain BTO crystal powder;

[0025] (4) Press the BTO crystal powder into tablets under a pressure of 20 MPa, then raise the temperature to 1000° C. at a rate of 20° C. / min, and keep the temperature for 5 hours to obtain B...

Embodiment 2

[0030] A method for preparing BTO ceramics. The preparation method uses barium acetylacetonate and titanyl acetylacetonate as raw materials, and uses absolute ethanol as a solvent to obtain BTO crystal powder through low-temperature calcination, and obtain BTO through high-temperature sintering after tableting. Ceramics, specifically comprising the following steps:

[0031] (1) Weigh 0.02mol of Ba(acac) 2 and 0.02mol of TiO(acac) 2 , added to 15ml of absolute ethanol, stirred vigorously with a magnetic stirrer to obtain a mixed solution;

[0032] (2) drying the mixed solution at 85° C. for 15 hours to obtain a dry product;

[0033] (3) Fully grind the dried product, then raise the temperature to 400°C at a rate of 15°C / min, and keep it warm for 2.5h to obtain BTO crystal powder;

[0034] (4) Press the BTO crystal powder into tablets under a pressure of 15 MPa, then raise the temperature to 800° C. at a rate of 15° C. / min, and keep it for 10 hours to obtain BTO ceramics.

Embodiment 3

[0036] A method for preparing BTO ceramics. The preparation method uses barium acetylacetonate and titanyl acetylacetonate as raw materials, and uses absolute ethanol as a solvent to obtain BTO crystal powder through low-temperature calcination, and obtain BTO through high-temperature sintering after tableting. Ceramics, specifically comprising the following steps:

[0037] (1) Weigh 0.03mol of Ba(acac) 2 and 0.03mol of TiO(acac) 2 , add 20ml of absolute ethanol, and stir vigorously with a magnetic stirrer to obtain a mixed solution;

[0038] (2) drying the mixed solution at 90°C for 10 hours to obtain a dry product;

[0039] (3) Fully grind the dried product, then raise the temperature to 600°C at a rate of 25°C / min, and keep it warm for 1.5h to obtain BTO crystal powder;

[0040] (4) Press the BTO crystal powder into tablets under a pressure of 10 MPa, then raise the temperature to 1250° C. at a rate of 25° C. / min, and keep it for 2 hours to obtain BTO ceramics.

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Abstract

The invention relates to the field of ferroelectric ceramic materials and discloses a method for preparing BaTiO3 ceramic.The method for preparing the BaTiO3 ceramic comprises the steps that acetylacetone barium and titanium oxide acetylacetonate serve as raw materials, absolute ethyl alcohol serves as solvent, and by means of low-temperature sintering, BaTiO3 crystal powder is obtained; and by means of high-temperature sintering, the BaTiO3 ceramic is obtained.Acetylacetone salt is adopted as a reaction presoma for the first time, the BaTiO3 ceramic is sintered and prepared, and the novel method for preparing BaTiO3 ceramic is provided.According to the method, the technology is simple, requirements for a reaction system are low, and energy consumption is low.A step-by-step temperature rising method is adopted, low-temperature sintering and high-temperature sintering are conducted, and by controlling sintering time at the different temperatures, the prepared BaTiO3 ceramic is good in crystallinity and superior in dielectric property.

Description

technical field [0001] The present invention relates to BaTiO 3 (BTO) dielectric materials, especially involving a BaTiO 3 A method for preparing ceramics belongs to the technical field of electronic ceramics preparation and application. Background technique [0002] Ferroelectric materials are an important class of functional materials, which have excellent properties such as dielectric, ferroelectric, piezoelectric and pyroelectric, electro-optic effects, acousto-optic effects and nonlinear optical effects, so they are used in optical waveguides, optical switches , Optical storage and other fields have very important applications. At present, the common ferroelectric materials include lead magnesium niobate titanate (PMNT), barium titanate (BTO) and lanthanum bismuth titanate (BLT). Among them, BTO series ferroelectric materials have been a hot research topic at home and abroad since the 1990s, because it has high dielectric coefficient, low dielectric loss, piezoelectr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/4682C04B35/622C04B2235/44
Inventor 张文星李立强梁果程文静
Owner SHANGQIU NORMAL UNIVERSITY
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