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Potassium sodium niobate KNN single crystal preparation method

A technology of potassium sodium niobate and single crystal, which is applied in the field of piezoelectric materials and can solve the problems of small size of potassium sodium niobate KNN single crystal

Inactive Publication Date: 2014-08-06
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the technical problem of the small size of potassium sodium niobate KNN single crystal in the prior art, and the purpose is to provide a new preparation method of potassium sodium niobate KNN single crystal

Method used

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  • Potassium sodium niobate KNN single crystal preparation method

Examples

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Embodiment 1

[0038] Potassium carbonate, sodium carbonate, and niobium oxide with a purity of 99.99% were dried at 300°C for 2 hours, and then mixed with 112.51g of potassium carbonate, 36.98g of sodium carbonate, and 309.16g of niobium oxide according to the ratio of 0.7:0.3:1, and ball milled for 20 hours to mix evenly Heat treatment at 850°C for 3 hours in a covered platinum crucible to obtain K 0.7 Na 0.3 NbO 3 Polycrystalline. Then the resulting K 0.7 Na 0.3 NbO 3 Polycrystalline ball milled for 20 hours, sieved, based on K 0.7 Na 0.3 NbO 3 Add a certain proportion of potassium carbonate and sodium carbonate as flux to the total amount of polycrystalline, K 2 CO 3 :Na 2 CO 3 :K 0.7 Na 0.3 NbO 3 The molar ratio is equal to 21:9:200 by adding K 2 CO 3 33.75g, Na 2 CO 3 11.10 g, placed again in a covered platinum crucible for heat treatment at 850°C for 3 hours. The resultant was pulverized with a corundum mortar, finely ground for 1 hour, sieved, put into a platinum g...

example 2

[0042] Example 2, after drying potassium carbonate, sodium carbonate and niobium oxide with a purity of 99.99% at 300°C for 2 hours, the ingredients were mixed according to the ratio of 0.5:0.5:1, potassium carbonate 80.37g, sodium carbonate 61.64g, niobium oxide 309.16g, ball milled for 15 After mixing evenly for 1 hour, place it in a covered platinum crucible and heat-treat at 850°C for 5 hours to obtain K 0.5 Na 0.5 NbO 3 Polycrystalline. Then the resulting K 0.5 Na 0.5 NbO 3 The polycrystalline material is crushed and ground in a corundum mortar for about 1 hour, and sieved, based on K 0.5 Na 0.5 NbO 3 A certain proportion of potassium carbonate and sodium carbonate are added to the total amount of polycrystalline powder as a flux, K 2 CO 3 :Na 2 CO 3 :K 0.5 Na 0.5 NbO 3 The molar ratio is equal to 15:15:200 by adding K 2 CO 3 24.11g, Na 2 CO 3 18.49g, ball milled for 20 hours, mixed evenly and put into the platinum growth crucible until it was full, and ...

example 3

[0044] Example 3, the purity is 99.99% potassium carbonate, sodium carbonate, niobium oxide 300 ℃ after drying for 2 hours according to the ratio of 0.85:0.15:1 ingredients, potassium carbonate 136.62g, sodium carbonate 18.49g, niobium oxide 309.16g, then add A certain proportion of potassium carbonate and sodium carbonate as flux, K 2 CO 3 :Na 2 CO 3 : The molar ratio of generalized KNN powder is equal to 17:3:200 by adding K 2 CO 3 27.32g, Na 2 CO 3 3.70g, ball milled for 20 hours, mixed evenly, cold isostatic pressed into blocks, placed in a covered platinum crucible and heat treated at 850°C for 10 hours. The resultant was pulverized in a corundum mortar and finely ground for 1 hour, then placed in a platinum growth crucible, and then the growth crucible was placed in a crystal growth furnace, such as figure 1 For the device shown, the temperature gradient above the liquid level is 15°C / cm. After heating up to 1090°C to completely melt the raw materials, it was fou...

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Abstract

The present invention discloses a potassium sodium niobate KNN single crystal preparation method, which comprises: weighing K2CO3, Na2CO3, and Nb2O5 according to a molar ratio of x:(1-x):1, carrying out ball milling to uniformly mix, and carrying out a heat treatment at a high temperature with a crucible to obtain a KNN(KxNa1-xNbO3) polycrystal; weighing a K2CO3 flux, a Na2CO3 flux and the KxNa1-xNbO3 according to a molar ratio of yx:y(1-x):100, carrying out ball milling to uniformly mix, and carrying out a heat treatment at a high temperature with the crucible; and placing the growth starting material into a growth crucible, filling the crucible, and adopting a top seed crystal (preferentially selecting the <001> direction KNN single crystal)flux Czochralski method to grow the KNN single crystal. With the technology, the KNN single crystal with a diameter of more than 25 mm and a length of more than 10 mm can grow, wherein the piezoelectric constant d33 achieves 120 pC / N, and the electromechanical coupling coefficient kt achieves 48.3%.

Description

technical field [0001] The invention belongs to the field of piezoelectric materials, and in particular relates to a preparation method of potassium sodium niobate KNN single crystal. Background technique [0002] Piezoelectric materials are important functional materials and are widely used in transducers, piezoelectric transformers, filters and ultrasonic motors. As an important functional material, piezoelectric materials occupy a considerable proportion in the field of electronic materials. In recent years, the global annual sales of piezoelectric materials have grown at a rate of about 15%. According to statistics, in 2000, the global sales of piezoelectric material products reached more than 3 billion US dollars. However, the most widely studied and applied piezoelectric materials are PZT, PMNT and PZNT lead-based composite perovskite-type relaxor ferroelectrics. Although these materials have very excellent electrical properties, because the lead content in lead-bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B15/00C30B29/30
Inventor 邓昊罗豪甦赵祥永李晓兵张海武陈超陈建伟林迪任博狄文宁徐海清王西安王升焦杰王威
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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