A preparation method of lithium manganese doped perovskite structure potassium sodium niobate tantalate lead-free piezoelectric single crystal with high voltage performance

Abstract

The invention discloses a lead-free sodium potassium tantalum niobate piezoelectric crystal with a lithium and manganese-doped perovskite structure with high piezoelectric property and a preparation method thereof, relates to the lead-free sodium potassium tantalum niobate piezoelectric crystal with a perovskite structure and a preparation method thereof, aims at solving the problems that the sodium potassium tantalum niobate crystal, and lithium, tantalum or manganese-doped potassium sodium niobate crystal prepared by the existing method leak electricity, and are uneven in component, low in electromechanical coupling coefficient and piezoelectric coefficient. The chemical formula of single crystal prepared by the method is [(NayK1-y)1-xLix](Nb1-zTaz)O3:Mn, wherein x is smaller than 0.07 and greater than 0.01; y is smaller than 0.7 and greater than 0.4; and z is smaller than 0.45 and greater than 0.25. The method comprises the following steps: 1, preparing raw materials; 2, ball-milling; 3, pre-burning; 4, repeatedly melting a pre-burnt polycrystal material; and 5, growing the crystal in a single crystal furnace. The lead-free sodium potassium tantalum niobate piezoelectric crystal with the lithium and manganese-doped perovskite structure with high piezoelectric property can be obtained.

Description

technical field [0001] The invention relates to a method for preparing a lead-free piezoelectric single crystal of potassium sodium niobate tantalate with a perovskite structure. Background technique [0002] In 2004, Y.Saito et al. reported a potassium sodium niobate (KNN) based piezoelectric ceramic with excellent piezoelectric properties in the journal Nature. The author used Li, Sb, Ta and other elements to partially replace the A-site and B-site ions in KNN, modified it, and improved the preparation process. Ceramic samples were prepared by directional template growth technology, and the piezoelectric strain constant reached a level comparable to that of Lead-based ceramics comparable level. This is a major breakthrough in the history of lead-free piezoelectric material research. Since then, KNN-based piezoelectric materials have been considered as one of the most potential lead-free piezoelectric materials, which has set off a worldwide research boom on KNN-based pie...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the potassium sodium niobate crystal and the lithium, tantalum or manganese doped potassium sodium niobate crystal prepared by the existing invention have electric leakage, uneven composition, low electromechanical coupling coefficient and piezoelectric coefficient, and Provides a preparation method of lithium-manganese-doped perovskite structure potassium sodium niobate tantalate lead-free piezoelectric single crystal with high-voltage performance

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