Laser synthesis method for barium dititanate ferroelectric ceramics

A technology of ferroelectric ceramics and barium titanate, which is applied in the field of preparation of ferroelectric ceramic materials, can solve problems such as limited applications, and achieve the effects of short time consumption, low energy consumption, and compact structure

Inactive Publication Date: 2011-02-09
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, BaTi with preferred orientation of b axis can be prepared 2 o 5 Ceramic methods mainly include Arc-melting, Rapid cooling and Floating zone. Although these methods can produce single crystal BaTi with excellent dielectric properties and b-axis preferred orientation 2 o 5 Ceramics, but its cross-sectional area is small, generally only micron, which limits its further application

Method used

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  • Laser synthesis method for barium dititanate ferroelectric ceramics
  • Laser synthesis method for barium dititanate ferroelectric ceramics
  • Laser synthesis method for barium dititanate ferroelectric ceramics

Examples

Experimental program
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Embodiment 1

[0029] BaCO 3 and TiO 2 The powders were mixed in a molar ratio of 1:2, ground in an agate mortar for 1 h, dried at 150°C for 2 h, then ground for 2 h in an agate mortar, and then pre-fired: starting from room temperature, heating at a rate of 3°C / min The temperature was raised to 900 °C and kept for 12 h in an air atmosphere, and then cooled with the furnace. The pre-fired powder was compacted under a pressure of 20 MPa and held for 60 s. The green body has a diameter of 13 mm and a thickness of 8 mm.

[0030] Place the green body on a horizontal sample stage, and use CO 2 The laser beam irradiates the front side of the sample vertically for 60s, then turn off the laser, turn the sample over, repeat the above steps, and irradiate the back side of the sample for 120s. During this process, the laser power was 800 W, and the defocus distance was 120 mm. Turn off the laser and let the sample cool down naturally. The prepared samples were annealed to obtain barium dititanate...

Embodiment 2

[0033]BaCO 3 and TiO 2 The powders were mixed at a molar ratio of 1:2, ground in an agate mortar for 1 h, dried at 150 °C for 2 h, and then ground in an agate mortar for 2 h. The fully mixed powder was compacted under a pressure of 20 MPa and held for 60 seconds. The green body has a diameter of 13 mm and a thickness of 8 mm.

[0034] Place the green body on the sample stage, and use CO 2 The laser beam directly irradiates one side of the sample for 60s and the opposite side for 120s. During this process, the laser power is 1000W, and the defocus distance is 120 mm. Turn off the laser and let the sample cool down naturally. The prepared samples were annealed, processed, and tested. The available density value is 5.00 g / cm 3 (97.8% of the theoretical density value), Curie temperature Tc around 420°C, high-purity BaTi with a preferred orientation growth structure along the b-axis with a high degree of orientation 2 o 5 ceramics.

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Abstract

The invention belongs to the technical field of ferroelectric ceramic materials, and in particular relates to a laser synthesis method for barium dititanate ferroelectric ceramics. BaCO3 and TiO2 powder are taken as raw materials and fully mixed, ground and pressed into a blank; the materials are radiated by CO2 laser beams with 800-1,000W, fully reacted in short time and melted to form barium dititanate; and the molar ratio of the BaCO3 to the TiO2 is 1:2. The method has the advantages of simple process, low cost, short time and low energy consumption; and the obtained sample has a microstructure which has high degree of orientation and grows in preferred orientation along a b axis; the obtained sample has high purity, large size and compact structure; and the process has good repeatability.

Description

technical field [0001] The invention belongs to the technical field of preparation of ferroelectric ceramic materials, in particular to a laser synthesis method of barium titanate ferroelectric ceramics. Background technique [0002] Ferroelectric ceramics refer to a large class of ceramic materials with ferroelectric properties, and are the most widely used functional ceramic materials. It has unique piezoelectric, pyroelectric, dielectric and ferroelectric properties, making it a broad application prospect in many fields. However, ferroelectric ceramics widely used at present are mainly lead-containing materials, which are likely to cause harm to human health and the natural environment during use and preparation. Barium titanate (BaTi 2 o 5 ) is a lead-free, environment-friendly ferroelectric ceramic that has been discovered in recent years and has received attention. Its unit cell parameters are: a=1.691nm, b=0.394nm, c=0.941nm, α=γ=90° , β=103.1°, monoclinic crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/64
Inventor 晁明举张俊吉李明玉李德川梁二军
Owner ZHENGZHOU UNIV
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