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Method for preparing [100] oriented textured barium titanate piezoelectric ceramics

A technology of barium titanate and piezoelectric ceramics, which is applied in the field of preparation of barium titanate piezoelectric ceramics textured in the [100] direction, can solve the problems of low piezoelectric performance of barium titanate ceramics, and overcome random growth , high density, and the effect of improving piezoelectric performance

Active Publication Date: 2018-01-16
BAOJI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of barium titanate mesoscopic crystal as the reaction template for the defect of extremely low piezoelectric performance of textured barium titanate ceramics prepared by using sheet-like barium titanate alone as a template, through casting The method for preparing barium titanate piezoelectric ceramics, the barium titanate piezoelectric ceramics are highly textured in the [100] direction, and the piezoelectric constant can reach more than 154pC / N

Method used

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  • Method for preparing [100] oriented textured barium titanate piezoelectric ceramics
  • Method for preparing [100] oriented textured barium titanate piezoelectric ceramics

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Embodiment 1

[0031]1. Preparation of barium titanate mesoscopic crystals:

[0032] Step 1: According to the ratio of Ba:Ti molar ratio of 1.25:1, weigh flake H 1.07 Ti 1.73 o 4 (HTO) and barium nitrate and mix, obtain mixture 0.096g;

[0033] Step 2: Put the mixture in a 20mL screw-top bottle. In order to mix it evenly, add 3 / 4 volume of zirconia beads and 2mL of absolute ethanol into the screw-top bottle, and use a ball mill at 300rpm for 24 hours to complete the ball milling Finally, the sample is dried at 50°C in a blast drying oven until the weight no longer decreases;

[0034] Step 3: Transfer the dried mixture to a crucible, place the crucible in a box-type resistance furnace and calcinate at 400°C to 900°C for 3h to 18h, cool to room temperature and wash with 0.5mol / L acetic acid and distilled water in sequence, wash the Afterwards, the sample was dried at 50° C. for 12 hours in an air blast drying oven to obtain barium titanate mesoscopic crystals.

[0035] like figure 1 and ...

Embodiment 2

[0047] Barium titanate mesoscopic crystals and barium titanate ceramic properties and performance-related test results:

[0048] Piezoelectric constant d 33 Test: The barium titanate ceramic sheet is ground, polished, coated with silver, and the piezoelectric performance is tested after firing the silver. This detection method is a conventional technical means in this field.

[0049] Figure 4 In order to use barium titanate mesoscopic crystals as raw materials, when the sintering temperature is different in the third stage of heat treatment, the XRD pattern of barium titanate piezoelectric ceramics is obtained. It can be seen from the figure that the obtained barium titanate ceramic has strong crystallinity, and the strongest diffraction peak (200) replaces the strongest diffraction peak of (110) in the barium titanate mesoscopic crystal. Because the (200) crystal plane is equivalent to the (100) crystal plane, that is to say, the textured barium titanate ceramics in the [1...

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Abstract

The invention discloses a method for preparing [100] oriented textured barium titanate piezoelectric ceramics. The method comprises the following steps: taking two-dimensional barium titanate mesocrystals and barium titanate powder as raw materials, preparing slurry into a membrane by adopting a tape casting method, and performing heat treatment after the membrane is prepared into a green body, thereby obtaining the [100] oriented textured barium titanate piezoelectric ceramics. According to the method, the barium titanate piezoelectric ceramics are prepared by utilizing anisotropism of piezoelectric materials and topological mesoscopic transformation of the mesocrystals; in the method, the flake barium titanate mesocrystal with large diameter height ratio and excellent orientation servesas a reaction template, the random growth property of the traditional barium titanate particles can be overcome, and the prepared [100] oriented textured barium titanate piezoelectric ceramic materialis capable of greatly improving the piezoelectric property of the barium titanate ceramics; the prepared barium titanate piezoelectric ceramic is small in particles and high in density, has an orientation degree of 28-80.6% in the [100] direction, reaches a piezoelectric constant of 154-322pC / N and can be widely applied to a piezoelectric sensor, a multi-layer capacitor or a memory.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric ceramic preparation, and in particular relates to a method for preparing barium titanate piezoelectric ceramics textured in the [100] direction. Background technique [0002] Piezoelectric ceramic material is a very important functional material, which is widely used in information, aerospace, electronics, sensors and other fields. For a long time, lead zirconate titanate (PZT) ceramic materials have excellent ferroelectric properties, dielectric properties, piezoelectric properties and optical properties. However, since the PZT ceramic material is a lead-containing material, the lead generated during its preparation and application will lead to environmental pollution and even lead poisoning of the human body. Therefore, research on lead-free piezoelectric materials that are environmentally friendly and have good piezoelectric properties has attracted much attention. [0003] Barium titan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 胡登卫康芳赵青苗磊张珍王艳程花蕾凡明锦杨得锁王晓玲
Owner BAOJI UNIV OF ARTS & SCI
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