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Preparation method of tantalump-doped potassium-sodium niobate lead-free piezoelectric single crystal with high electromechanical coupling property

An electromechanical coupling, potassium sodium niobate technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, single crystal growth, single crystal growth, etc., can solve the problem of small single crystal size, low electromechanical coupling coefficient, niobate Potassium-sodium-based lead-free piezoelectric single crystal growth is difficult and other problems, to achieve the effect of uniform composition, outstanding performance, and excellent electrical properties

Inactive Publication Date: 2013-12-11
HARBIN INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of the existing potassium-sodium niobate-based lead-free piezoelectric single crystal growth difficulty, small single crystal size and low electromechanical coupling coefficient, and provide a tantalum-doped niobium with high electromechanical coupling performance Preparation method of lead-free piezoelectric single crystal of sodium potassium phosphate

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  • Preparation method of tantalump-doped potassium-sodium niobate lead-free piezoelectric single crystal with high electromechanical coupling property
  • Preparation method of tantalump-doped potassium-sodium niobate lead-free piezoelectric single crystal with high electromechanical coupling property
  • Preparation method of tantalump-doped potassium-sodium niobate lead-free piezoelectric single crystal with high electromechanical coupling property

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specific Embodiment approach 1

[0020] Specific embodiment 1: This embodiment is a method for preparing tantalum-doped potassium sodium niobate lead-free piezoelectric single crystal with high electromechanical coupling performance, which is characterized in that the tantalum-doped potassium sodium niobate lead-free piezoelectric single crystal with high electromechanical coupling performance The chemical formula of piezoelectric single crystal is (K 1-x Na x )(Nb 1-y Ta y )O 3 , wherein 0.4<x<0.7, 0.20<y<0.35; the specific preparation method is completed in the following steps:

[0021] 1. Raw materials for pre-sintering and synthesizing polycrystalline powder:

[0022] ①. Prepare raw materials: according to the chemical formula (K 1-x Na x )(Nb 1-y Ta y )O 3 According to Na element: K element: Ta element: Nb element molar ratio is x: (1-x): y: (1-y) Prepare Na 2 CO 3 、K 2 CO 3 、 Ta 2 o 5 and Nb 2 o 5 ; said (K 1-x Na x )(Nb 1-y Ta y )O 3 Medium: 0.4<x<0.7, 0.20<y<0.35;

[0023] ②. We...

specific Embodiment approach 2

[0031] Specific embodiment 2: the difference between this embodiment and specific embodiment 1 is: (K) described in step 1. 1-x Na x )(Nb 1-y Ta y )O 3 Middle: x=0.5, y=0.3. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0032] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is: in step 1.2, Na 2 CO 3 、K 2 CO 3 、 Ta 2 o 5 and Nb 2 o 5 The volume ratio of the total mass to absolute ethanol is 1g:1mL. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of tantalump-doped potassium-sodium niobate lead-free piezoelectric single crystal with a high electromechanical coupling property, relates to a preparation method of potassium-sodium niobate base lead-free piezoelectric single crystal, and aims to solve the problems that the conventional potassium-sodium niobate base lead-free piezoelectric single crystal is hard to grow, small in size and low in electromechanical coupling coefficient. The chemical formula of the tantalump-doped potassium-sodium niobate lead-free piezoelectric single crystal with the high electromechanical coupling property is (K1-xNax)(Nb1-yTay)O3, wherein x is greater than 0.4 and less than 0.7, and y is greater than 0.20 and less than 0.35. The preparation method particularly comprises the following steps: step one, pre-sintering so as to synthesize a polycrystal powder raw material; step two, putting the polycrystal powder raw material into a single crystal pull furnace so as to carry out single crystal growth; step three, cooling and annealing by using a multi-step cooling method. The preparation method has the advantages that firstly, the growth process is simple and low in cost, secondly, the prepared tantalump-doped potassium-sodium niobate single crystal is large in size and good in quality, and thirdly, the high electromechanical coupling property is achieved. By utilizing the preparation method, a piezoelectric material with the high electromechanical coupling property is prepared.

Description

technical field [0001] The invention relates to a preparation method of potassium sodium niobate-based lead-free piezoelectric single crystal material. Background technique [0002] Piezoelectric material is a material that realizes the mutual conversion between mechanical energy and electrical energy, and is an indispensable class of functional materials in industry and daily life. However, the most widely used piezoelectric materials so far are still lead-based materials. Lead-based piezoelectric materials have caused great pollution to the environment in the process of production and use, and the environmental coordination is not good. This shortcoming severely limits the application of lead-based piezoelectric materials. Therefore, exploring lead-free piezoelectric materials with good piezoelectric properties is an urgent task in the field of functional materials research. In 2004, Y.Saito [Nature, 432, 84-87, (2004)] et al reported Li, Sb, Ta doped potassium sodium ni...

Claims

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Application Information

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IPC IPC(8): C30B29/30C30B15/00C30B33/02H01L41/22
Inventor 霍晓青郑立梅王军军张锐王锐桑士晶曹文武杨彬
Owner HARBIN INST OF TECH
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