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Transparent potassium sodium niobate crystal and preparation method and application thereof

A technology of potassium sodium niobate and crystals, which is applied in the field of piezoelectric crystal materials, can solve the problems of low transparency of potassium sodium niobate crystals, failure to meet the needs of photovoltaic piezoelectric device applications, poor crystal quality, etc., and achieve good crystallinity , The growth process is controllable and the effect is good in repeatability

Active Publication Date: 2022-01-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the deficiencies in the prior art, especially the potassium sodium niobate crystals prepared are not high in transparency, poor in crystal quality, and cannot meet the needs of photoelectric piezoelectric device applications. The present invention Provide a high-quality potassium sodium niobate transparent single crystal and its preparation method, the crystal has high transparency and good piezoelectric performance, and can be used to make photoelectric piezoelectric devices

Method used

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  • Transparent potassium sodium niobate crystal and preparation method and application thereof
  • Transparent potassium sodium niobate crystal and preparation method and application thereof
  • Transparent potassium sodium niobate crystal and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0039] Example 1: K 0.5 Na 0.5 NbO 3 crystal growth

[0040] Na with a purity of 99.99% 2 CO 3 、K 2 CO 3 and Nb 2 o 5 The raw materials were weighed according to the stoichiometric ratio and then placed in vacuum drying at 120°C, and the polycrystalline potassium sodium niobate was synthesized by a solid-state sintering method. Add the obtained polycrystalline material into the platinum crucible, and vacuumize to 1×10 -4 Pa, filled with 20% O by volume 2The mixed gas of +80% Ar is brought to an atmospheric pressure, the temperature is raised to slowly melt the raw materials, and the temperature is kept constant for 2 hours after all the raw materials are melted. After adjusting the seeding temperature, the potassium sodium niobate seed crystal is slowly lowered to the surface of the melt for shoulder and equal-diameter growth. The crystals are stripped as they grow to the desired size. During the process, the crystal pulling speed was 1 mm / h, and after the growth w...

Embodiment 2

[0041] Embodiment 2: (Na 0.5 K 0.5 )(Nb 0.98 mn 0.02 )O 3 crystal growth

[0042] Na with a purity of 99.99% 2 CO 3 、K 2 CO 3 , Nb 2 o 5 and MnO raw materials were weighed according to the stoichiometric ratio, and then placed in vacuum drying at 150 ° C, and the polycrystalline potassium sodium niobate was synthesized by a solid-state sintering method. Add the obtained polycrystalline material into the platinum crucible, and vacuumize to 1×10 -4 Pa, filled with 20% O by volume 2 The mixed gas of +80% Ar is brought to an atmospheric pressure, the temperature is raised to slowly melt the raw materials, and the temperature is kept constant for 2 hours after all the raw materials are melted. After adjusting the planting temperature, planting, shouldering and equal-diameter growth are carried out at one time. The crystals are stripped as they grow to the desired size. During the process, the crystal pulling speed was 1 mm / h, and after the growth was completed, it was...

Embodiment 3

[0043] Embodiment 3: (Na 0.5 K 0.5 )(Nb 0.95 Ta 0.05 )O 3 crystal growth

[0044] Na with a purity of 99.99% 2 CO 3 、K 2 CO 3 , Nb 2 o 5 and Ta 2 o 5 The raw materials were weighed according to the stoichiometric ratio and placed in vacuum drying at 170°C, and the potassium sodium niobate polycrystalline material was synthesized by a solid-state sintering method. Add the obtained polycrystalline material into the platinum crucible, and vacuumize to 1×10 -4 Pa, filled with 20% O by volume 2 The mixed gas of +80% Ar is brought to an atmospheric pressure, the temperature is raised to slowly melt the raw materials, and the temperature is kept constant for 2 hours after all the raw materials are melted. After adjusting the planting temperature, planting, shouldering and equal-diameter growth are carried out at one time. The crystals are stripped as they grow to the desired size. During the process, the crystal pulling speed was 1 mm / h, and after the growth was compl...

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Abstract

The invention relates to a transparent potassium sodium niobate crystal and a preparation method and application thereof. The molecular formula of the potassium sodium niobate crystal is (Na (1-x-y) KxLiy) (Nb1-zAz) O3, wherein x is more than or equal to 0.1 and less than or equal to 0.9, y is more than or equal to 0 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.5, A is Ta, Mn or Sb, and the visible region transmittance of the potassium sodium niobate crystal is more than or equal to 70%. The preparation method of the transparent potassium sodium niobate-based single crystal comprises the following steps: firstly, synthesizing a polycrystal material by utilizing solid-phase sintering, correspondingly adding various alternative elements if doping modification is carried out, and then sequentially carrying out melting, seeding, shouldering and equal-diameter growth by utilizing a top seed crystal fluxing agent method. The method provided by the invention effectively solves the problems of low transparency, poor crystallization quality and the like of the existing potassium-sodium niobate crystal product, thereby growing the high-quality potassium-sodium niobate transparent single crystal. The transmittance of the potassium-sodium niobate single crystal grown by the method in a visible light region exceeds 70%.

Description

technical field [0001] The invention relates to a transparent piezoelectric crystal and a preparation method thereof, in particular to a potassium sodium niobate transparent single crystal and a preparation method thereof, and belongs to the field of piezoelectric crystal materials. Background technique [0002] Piezoelectric materials, as functional materials for electromechanical conversion, are widely used in many fields such as ultrasound, underwater acoustics, electronics, automatic control, machinery, etc., and play an irreplaceable role in the modern information society. Nowadays, the development of piezoelectric materials is changing with each passing day; correspondingly, the application fields of piezoelectric materials are also expanding, among which transparent piezoelectric materials for optical applications have gradually attracted widespread attention. [0003] Transparent piezoelectric materials refer to piezoelectric materials with good permeability, which c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B9/12H01L41/187H01L41/43H10N30/097H10N30/853
CPCC30B29/30C30B9/12H10N30/8542H10N30/097
Inventor 付秀伟尹芳艺陶绪堂贾志泰刘蕾
Owner SHANDONG UNIV
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