Potassium-sodium niobate lead-free transparent ferroelectric ceramic and preparation method thereof

Abstract

The invention discloses potassium-sodium niobate lead-free transparent ferroelectric ceramic and a preparation method thereof, and belongs to the technical field of ceramic materials. The chemical general formula of the potassium-sodium niobate lead-free transparent ferroelectric ceramic is (K < 0.48 > Na < 0.52 >) NbO < 3-x > La < 2 > O < 3 >, and x represents the mole number of lanthanum oxide La < 2 > O < 3 > and ranges from 0.005 to 0.04. The preparation method of the potassium-sodium niobate lead-free transparent ferroelectric ceramic comprises the following steps: S1, weighing raw materials; s2, carrying out primary ball milling on the raw materials; s3, pre-sintering the primary mixed powder material; s4, carrying out secondary ball milling on the pre-sintered material; s5, adding a polyvinyl alcohol aqueous solution into the secondary mixed powder for granulation; s6, sieving the granulated powder materials; s7, the fine powder is subjected to tabletting and glue discharging treatment in sequence; s8, sintering the ceramic body; and S9, plating a silver electrode on the ceramic body, and applying voltage for polarization. By adopting the potassium-sodium niobate lead-free transparent ferroelectric ceramic and the preparation method thereof, the transparent ferroelectric ceramic material with high compactness and low dielectric loss is obtained, and has the advantages of good comprehensive properties of light transmission and ferroelectricity.

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