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A kind of preparation method of 0.94bi0.5na0.5tio3-0.06batio3 lead-free piezoelectric ceramics

A lead-free piezoelectric and ceramic technology, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., to achieve high thermal depolarization temperature, simple equipment and preparation process

Inactive Publication Date: 2016-07-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is currently no efficient way to increase the 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 Thermal depolarization temperature of piezoelectric ceramics until the thermal depolarization is eliminated

Method used

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  • A kind of preparation method of 0.94bi0.5na0.5tio3-0.06batio3 lead-free piezoelectric ceramics
  • A kind of preparation method of 0.94bi0.5na0.5tio3-0.06batio3 lead-free piezoelectric ceramics
  • A kind of preparation method of 0.94bi0.5na0.5tio3-0.06batio3 lead-free piezoelectric ceramics

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Embodiment 1

[0024] (1), according to the chemical formula 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 : 0.3ZnO, weighing the dried single-phase 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 powder and ZnO powder, add alcohol to the mixture of the three powders, and then ball mill (320 rpm, 24 hours) to mix the powders evenly;

[0025] (2), after drying the powder mixture obtained in step (1), grind it with a mortar to make it uniform;

[0026] (3), adding alcohol to the powder mixture obtained in step (2), then ball milling (320 rpm, 24 hours) to further mix it evenly, and dry it;

[0027] (4), press the powder mixture obtained in step (3) into thin sheets with a pressure of 20MPa. The flakes are circular, with a diameter of 10mm±1mm and a thickness of 3mm±1mm, to facilitate the detection of the properties of ceramics;

[0028] (5), put the powder mixture obtained in step (3) into the crucible, put the flakes in again, and cover the flakes with the powder mixture obtained in step (3), so that th...

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Abstract

The invention discloses a 0.94Bi 0.5 Na 0.5 TiO 3 ‑0.06BaTiO 3 Preparation method of lead-free piezoelectric ceramics, single-phase lead-free piezoelectric material 0.94Bi 0.5 Na 0.5 TiO 3 ‑0.06BaTiO 3 Mix the powder and ZnO powder evenly and sinter at 1000°C for 1.0 hours to obtain 0.94Bi 0.5 Na 0.5 TiO 3 ‑0.06BaTiO 3 : x ZnO( x =0,0.1,0.2,0.3,0.4 is ZnO relative to 0.94Bi 0.5 Na 0.5 TiO 3 ‑0.06BaTiO 3 molar percentage) 0-3 type composite lead-free piezoelectric ceramic, in which ZnO exists as independent particles in 0.94Bi 0.5 Na 0.5 TiO 3 ‑0.06BaTiO 3 in the base. The thermal depolarization temperature of the composite piezoelectric ceramic increases as the concentration of ZnO increases until the thermal depolarization disappears. The equipment and preparation process required by the method of the present invention are simple and easy to implement.

Description

technical field [0001] The present invention relates to a 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 A method for preparing lead-free piezoelectric ceramics. Background technique [0002] Bi 0.5 Na 0.5 TiO 3 Perovskite-based oxide materials have good piezoelectric properties at room temperature and are one of the lead-free piezoelectric materials with important application prospects. Constrain Bi 0.5 Na 0.5 TiO 3 The key issue for the practical application of lead-free piezoelectric ceramics is their thermal depolarization. For example, as Bi 0.5 Na 0.5 TiO 3 A typical representative of lead-free piezoelectric ceramics, Bi 0.5 Na 0.5 TiO 3 -BaTiO 3 Its piezoelectricity begins to weaken at about 50°C, so its piezoelectric coefficient decreases rapidly as the temperature increases. There is currently no efficient way to increase the 0.94Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 The thermal depolarization temperature of piezoelectric ceramics until the thermal depolariza...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/475C04B35/622H10N30/853
Inventor 张善涛张骥卢明辉陈延彬陈延峰
Owner NANJING UNIV
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