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Tetragonal phase A and B site co-substituted lead-free piezoelectric textured ceramic with excellent temperature stability as well as preparation method and application of tetragonal phase A and B site co-substituted lead-free piezoelectric textured ceramic

A lead-free piezoelectric and tetragonal phase technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric devices/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, etc., can Solve problems such as the deterioration of the temperature stability of the piezoelectric coefficient, and achieve the effects of widening the temperature range, excellent temperature stability, and high piezoelectric coefficient

Active Publication Date: 2021-11-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to solve the existing Curie temperature T of BT-based ceramic materials in the prior art. c Reduce and deteriorate the temperature stability of the piezoelectric coefficient, and provide a tetragonal phase A and B site co-substituted lead-free piezoelectric textured ceramics with excellent temperature stability and its preparation method and application

Method used

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  • Tetragonal phase A and B site co-substituted lead-free piezoelectric textured ceramic with excellent temperature stability as well as preparation method and application of tetragonal phase A and B site co-substituted lead-free piezoelectric textured ceramic
  • Tetragonal phase A and B site co-substituted lead-free piezoelectric textured ceramic with excellent temperature stability as well as preparation method and application of tetragonal phase A and B site co-substituted lead-free piezoelectric textured ceramic
  • Tetragonal phase A and B site co-substituted lead-free piezoelectric textured ceramic with excellent temperature stability as well as preparation method and application of tetragonal phase A and B site co-substituted lead-free piezoelectric textured ceramic

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specific Embodiment approach 1

[0033] Specific embodiment 1: In this embodiment, the tetragonal phase A and B sites with excellent temperature stability are co-substituted for lead-free piezoelectric textured ceramics, and its general chemical formula is (Ba 1-x Ca x )(Ti 1-y E. y )O 3 , where E is Zr or Hf, 0.12<x<0.30, 0<y<0.09;

[0034] The orthorhombic O-tetragonal T phase transition temperature T o-t Below room temperature, the ceramic is a perovskite structure of pure tetragonal phase (T) at room temperature, by [001] c or[111] c Tetragonal phase grains with preferred orientation, the preferred orientation degree is above 90%; when the tetragonal phase grains along the [001] c When the orientation is preferred, the cross-section of the ceramic is a cuboid brick wall; when the tetragonal grains are along the [111] c When the preferred orientation is selected, the ceramic cross-section is a diamond-like stacking morphology;

[0035] The Curie temperature of the tetragonal phase A and B co-substi...

specific Embodiment approach 2

[0037] Embodiment 2: This embodiment differs from Embodiment 1 in that the rate of change of the piezoelectric coefficient in the range from room temperature to Curie temperature is less than 10%. Others are the same as the first embodiment.

specific Embodiment approach 3

[0038] Specific Embodiment Three: In this embodiment, the tetragonal phase A and B sites with excellent temperature stability co-substitute the preparation method of lead-free piezoelectric textured ceramics, which is completed according to the following steps:

[0039] 1. Preparation of precursor base material:

[0040] The general chemical formula of the target component of textured ceramics (Ba 1-x Ca x )(Ti 1-y E. y )O 3 The stoichiometric ratio is based on weighing BaCO 3 Powder, CaCO 3 Powder, TiO 2 Powder and ZrO 2 Powder as raw material, or weigh BaCO 3 Powder, CaCO 3 Powder, TiO 2 Powder and HfO 2 Powder is the raw material; the weighed raw material is made of ethanol as the ball milling medium, and after ball milling, drying, pre-calcination, secondary ball milling, drying and sieving, the precursor base material is obtained; where E is Zr or Hf, 0.12 <x<0.30, 0<y<0.09;

[0041] The TiO 2 Powder, ZrO 2 Powder and HfO 2 The particle size of the powder ...

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Abstract

The invention discloses tetragonal phase A and B site co-substituted lead-free piezoelectric textured ceramic with excellent temperature stability and a preparation method and application thereof, and belongs to the field of piezoelectric ferroelectric materials. The problems that the Curie temperature Tc of a BT-based ceramic material is reduced and the temperature stability of a piezoelectric coefficient is deteriorated in the prior art are solved. The chemical general formula of the textured ceramic is (Ba<1-x>Ca<x>)(Ti<1-y>E<y>)O3, the textured ceramic is of a perovskite structure of a pure tetragonal phase at room temperature, and the preferred orientation degree along [001]c or [111]c is 90% or above. The method comprises the following steps: 1, preparing a precursor base material; 2, selecting and weighing template seed crystals; 3, preparing tape casting slurry; 4, preparing a ceramic green body; and 5, preparing the tetragonal phase lead-free textured ceramic. According to the application, the material is applied to an electronic device which keeps stable electromechanical output in an interval from room temperature to 100 DEG C.

Description

technical field [0001] The invention belongs to the field of piezoelectric ferroelectric materials. Background technique [0002] Piezoelectric actuators, smart sensors, ultrasonic transducers and energy harvesters based on the unique electromechanical energy conversion capabilities of perovskite piezoelectric materials are widely used in information technology, advanced manufacturing, medical health, new energy and aerospace. There is an important demand in high-tech fields such as Due to its outstanding electromechanical properties and temperature stability, lead zirconate titanate (PZT)-based piezoelectric ceramics have been the most widely used piezoelectric materials and occupy a major market share. However, such lead-based materials will cause harm to human health and the ecological environment during production, use and disposal. At present, the research and development of lead-free piezoelectric ceramics with high performance and good temperature stability to repla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622H01L41/09H01L41/113H01L41/187H01L41/37H10N30/092H10N30/20H10N30/30H10N30/853
CPCC04B35/468C04B35/622C04B2235/96C04B2235/442C04B2235/3244C04B2235/3232C04B2235/5454H10N30/20H10N30/8536H10N30/302H10N30/853H10N30/092
Inventor 常云飞寇蔷薇刘琳婧谢航孙媛杨彬
Owner HARBIN INST OF TECH
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