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Textured rare earth modified lead magnesium niobate-lead titanate-based piezoelectric ferroelectric ceramic material and preparation method thereof

A technology of rare earth modification and lead magnesium niobate, which is applied in the field of functional ceramic materials, can solve the problems of low electrical performance and achieve the effects of simple equipment, high production efficiency, improved cost performance and market competitiveness

Inactive Publication Date: 2019-10-25
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the random distribution of the grain orientation of traditional PMN-PT ceramics, part of the performance in each direction is offset by each other, resulting in very low electrical properties of traditional PMN-PT ceramics.

Method used

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  • Textured rare earth modified lead magnesium niobate-lead titanate-based piezoelectric ferroelectric ceramic material and preparation method thereof
  • Textured rare earth modified lead magnesium niobate-lead titanate-based piezoelectric ferroelectric ceramic material and preparation method thereof
  • Textured rare earth modified lead magnesium niobate-lead titanate-based piezoelectric ferroelectric ceramic material and preparation method thereof

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preparation example Construction

[0042] The preparation method of a textured rare earth modified lead magnesium niobate-lead titanate-based piezoelectric ferroelectric ceramic material specifically includes the following steps:

[0043] Step 1. Use CP or AR grade PbO, MgO, Nb 2 o 5 、TiO 2 and Sm 2 o 3 or Dy 2 o 3 As a raw material, a pure-phase rare earth modified lead magnesium niobate-lead titanate based piezoelectric ferroelectric ceramic matrix was prepared by a two-step solid-state reaction method;

[0044] Specifically, first use MgO and Nb 2 o 5 Synthesis of pure phase MgNb by reaction 2 o 6 precursor, and then the pure phase MgNb 2 o 6 Precursors, PbO, TiO 2 and Sm 2 o 3 or Dy 2 o 3 Mixing by ball milling, drying, and sintering to obtain a pure-phase rare earth modified lead magnesium niobate-lead titanate-based piezoelectric ferroelectric ceramic matrix;

[0045] Step 2. Using Bi 2 o 3 、TiO 2 and BaCO 3 As a raw material, BaTiO with a perovskite structure was prepared by local ch...

Embodiment 1

[0051] The composition of the textured rare earth modified lead magnesium niobate-lead titanate based piezoelectric ferroelectric ceramic material is:

[0052] [R x -Pb (1-1.5x) ][(Mg 1 / 3 Nb 2 / 3 )(1-y)Ti y ]O 3 –avol.%BaTiO 3 ;

[0053] Among them, R=Sm 3+ , x=0.01, y=0.29, a=0.05.

[0054] Step 1. Use CP or AR grade PbO, MgO, Nb 2 o 5 、TiO 2 and Sm 2 o 3 as raw material, fully dried and then used; using MgO and Nb 2 o 5 Synthesis of pure phase MgNb by reaction 2 o 6 precursor, and then the pure phase MgNb 2 o 6 Precursors and PbO, TiO 2 and Sm 2 o 3 Ball milling, drying, and sintering to obtain a pure-phase rare earth modified lead magnesium niobate-lead titanate ceramic matrix;

[0055] Step 2. Put Bi 2 o 3 、TiO 2 After uniform mixing with molten salt at 1100-1200°C, Bi 4 Ti 3 o 12 Powder, wherein, molten salt one is a mixture of NaCl molten salt and KCl molten salt with a molar ratio of 1:1; Bi 4 Ti 3 o 12 Powder, BaCO 3 、TiO 2 Mix and stir ...

Embodiment 2

[0064] The composition of the textured rare earth modified lead magnesium niobate-lead titanate based piezoelectric ferroelectric ceramic material is:

[0065] [Rx -Pb (1-1.5x) ][(Mg 1 / 3 Nb 2 / 3 )(1-y)Ti y ]O 3 –avol.%BaTiO 3 ;

[0066] Among them, R=Sm 3+ , x=0.025, y=0.29, a=0.05.

[0067] Step 1. Use CP or AR grade PbO, MgO, Nb 2 o 5 、TiO 2 and Sm 2 o 3 as raw material, fully dried and then used; using MgO and Nb 2 o 5 Synthesis of pure phase MgNb by reaction 2 o 6 precursor, and then the pure phase MgNb 2 o 6 Precursors and PbO, TiO 2 and Sm 2 o 3 Ball milling, drying, and sintering to obtain a pure-phase rare earth modified lead magnesium niobate-lead titanate ceramic matrix;

[0068] Step 2. Put Bi 2 o 3 、TiO 2 After uniform mixing with molten salt at 1100-1200°C, Bi 4 Ti 3 o 12 Powder, wherein, molten salt one is a mixture of NaCl molten salt and KCl molten salt with a molar ratio of 1:1; Bi 4 Ti 3 o 12 Powder, BaCO 3 、TiO 2 Mix and stir w...

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Abstract

The invention provides a textured rare earth modified lead magnesium niobate-lead titanate-based piezoelectric ferroelectric ceramic material and a preparation method thereof. The composition of the textured rare earth modified lead magnesium niobate-lead titanate-based piezoelectric ferroelectric ceramic material is expressed by a following formula of [R<x>-Pb<1- 1.5x>][(Mg<1 / 3>Nb<2 / 3>)<1-y>Ti<y>]O3-avol.%BaTiO3, wherein <x> is greater than 0 and less than or equal to 0.03, <y> is greater than or equal to 0.29 and less than or equal to 0.325, a is greater than or equal to 0.01 and less than or equal to 0.1, <x> and <y> are mole numbers, and a is the volume percentage; R<x> is one of Sm<3+> or Dy<3+>; first higher piezoelectric activity is achieved in a matrix material through rare earth modification; then, ceramic crystal grains are subjected to oriented growth in a certain direction through texturing to further improve the piezoelectric property of the ceramic material; the texturedrare earth modified lead magnesium niobate-lead titanate-based piezoelectric ferroelectric ceramic material prepared has a degree of texturing of 40-90% in the [001] direction, and the piezoelectric coefficient d<33> is 40%-80% higher than that of unmodified non-textured ceramic; the dielectric constant at a room temperature under the frequency of 1 kHz is about 1.8-2 times higher than that of theunmodified non-textured ceramic; the textured rare earth modified lead magnesium niobate-lead titanate-based piezoelectric ferroelectric ceramic material can be applied to piezoelectric devices suchas ultrasonic transducers, drives and sensors; and the piezoelectric ceramic material is low in cost and simple in preparation process and is conducive to industrial production.

Description

technical field [0001] The invention belongs to the technical field of functional ceramic materials, in particular to a textured rare earth modified lead magnesium niobate-lead titanate based piezoelectric ferroelectric ceramic material and a preparation method thereof. Background technique [0002] As an extremely important functional material in today's society, ferroelectric materials have shown great application potential in the field of information storage because of their two polar states; at the same time, because they can output electrical signals under stress, and vice versa It can generate strain under voltage driving, and is widely used as the core material of piezoelectric sensors, actuators, transducers and other devices. Wide range of applications. [0003] (1-x)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -xPbTiO 3 (PMN-PT) relaxed piezoelectric single crystal has ultra-high piezoelectric response, and its piezoelectric coefficient d 33 Up to 2800pC / N; PMN-PT is near the quasi...

Claims

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Application Information

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IPC IPC(8): C04B35/499C04B35/622C04B35/626
CPCC04B35/499C04B35/622C04B35/62605C04B35/62675C04B2235/3206C04B2235/3215C04B2235/3224C04B2235/3236C04B2235/768
Inventor 任巍郑坤庄建全熠赵金燕姜知水文理
Owner XI AN JIAOTONG UNIV
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