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Quadrature-phase lithium tantalum doped potassium sodium niobate based lead-free piezoelectric single crystal and preparation method thereof

A potassium sodium niobate-based, lead-free piezoelectric technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problem of small size, low piezoelectric performance, potassium sodium niobate based piezoelectric Crystal growth difficulties and other problems, to achieve uniform quality, good piezoelectric properties, good electrical properties

Active Publication Date: 2012-08-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention solves the technical problems of difficult growth of potassium sodium niobate-based piezoelectric single crystal, small size and low piezoelectric performance, and provides an orthorhombic lithium-tantalum-doped potassium-sodium niobate-based lead-free piezoelectric single crystal and its preparation method

Method used

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  • Quadrature-phase lithium tantalum doped potassium sodium niobate based lead-free piezoelectric single crystal and preparation method thereof
  • Quadrature-phase lithium tantalum doped potassium sodium niobate based lead-free piezoelectric single crystal and preparation method thereof
  • Quadrature-phase lithium tantalum doped potassium sodium niobate based lead-free piezoelectric single crystal and preparation method thereof

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specific Embodiment approach 1

[0018] Specific implementation mode 1: The chemical formula of the orthorhombic lithium tantalum doped potassium sodium niobate-based lead-free piezoelectric single crystal in this embodiment is (K 1-x-y Na x Li y )(Nb 1-z Ta z )O 3 , its structure is perovskite structure, wherein 0.3<x<0.6, 0.01<y<0.03, 0.1<z<0.2.

specific Embodiment approach 2

[0019] Specific embodiment two: In this embodiment, the preparation method of the orthorhombic lithium-tantalum-doped potassium sodium niobate-based lead-free piezoelectric single crystal is as follows:

[0020] 1. According to the chemical formula (K 1-x-y Na x Li y )(Nb 1-z Ta z )O 3 K 2 CO 3 、Na 2 CO 3 , Li 2 CO 3 、 Ta 2 o 5 and Nb 2 o 5 , wherein the molar ratio of K element to the sum of K element, Na element and Li element is 0.6-0.8:1, the molar ratio of Li element to the sum of K element, Na element and Li element is 0.04-0.07:1, and Ta element The molar ratio to the sum of Nb element and Ta element is 0.06~0.12:1, and then K 2 CO 3 、Na 2 CO 3 , Li 2 CO 3 、 Ta 2 o 5 and Nb 2 o 5 Put it into a polyethylene ball mill tank, use zirconia balls and alcohol as the medium, and ball mill for 12 hours under the condition that the speed of the ball mill is 200r / min to obtain a slurry;

[0021] 2. Dry the slurry at 90°C, then press it into a disc with a d...

specific Embodiment approach 3

[0028] Specific embodiment three: the difference between this embodiment and specific embodiment two is that K described in step one 2 CO 3 、Na 2 CO 3 , Li 2 CO 3 、 Ta 2 o 5 and Nb 2 o 5 The purity of the powder is 99.99%. Others are the same as in the second embodiment.

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Abstract

A quadrature-phase lithium tantalum doped sodium potassium niobate based lead-free piezoelectric single crystal and a preparation method thereof, relate to a functional single crystal material and a preparation method thereof. The preparation method provided in the invention solves the technical problems of growth difficulty, small size and weak piezoelectric property existing in potassium sodium niobate based piezoelectric single crystal. The method compromises the following steps of: firstly, preparing slurry; second, synthesizing polycrystal; thirdly, melting raw materials; fourthly, performing neck-contracting; fifthly, performing shoulder-expanding ; sixthly, performing diameter-equating; and seventhly, performing cooling. The method provided in the invention has the advantages of simple process, a short growth cycle and low cost. The potassium sodium niobate based piezoelectric single crystal produced by the growth method, is characterized by large size, uniform mass and good electrical property with radial size being about 8 mm and length being about 20 mm. the quadrature-phase lithium tantalum doped potassium sodium niobate based piezoelectric single crystal provided in the invention is of a pure perovskite structure, without any other impurity phase. The lithium tantalum doped potassium sodium niobate based piezoelectric single crystal is a quadrature-phase structure at room temperature. The quadrature-phase lithium tantalum doped potassium sodium niobate based piezoelectric single crystal has very good piezoelectric property.

Description

technical field [0001] The invention relates to a functional single crystal material and a preparation method thereof. Background technique [0002] Piezoelectric materials are an important class of functional materials, but lead-based composites, such as lead zirconate titanate and lead magnesium niobate, still dominate piezoelectric materials. In these lead-based piezoelectric materials, the weight percentage of lead oxide is as high as about 70%, which brings great harm to the environment and human beings in the process of preparation, use and disposal. Countries around the world have successively legislated to restrict the use of lead in electronic materials and components. Therefore, the development of lead-free piezoelectric material systems with good environmental coordination performance is an urgent topic with great practical significance. [0003] Potassium Sodium Niobate ((K,Na)NbO 3 , abbreviated as KNN)-based lead-free piezoelectric materials have good piezoe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B15/00
Inventor 郑立梅霍晓青王军军仪修杰张锐曹文武杨彬
Owner HARBIN INST OF TECH
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