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Potassium sodium niobate-bismuth sodium zirconate lead-free piezoelectric single crystal and its growth method

A sodium bismuth zirconate, lead-free piezoelectric technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of small crystal size, many cracks, poor crystal crystallization, etc. The effect of high Curie temperature, excellent piezoelectric and ferroelectric properties

Active Publication Date: 2019-10-15
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

Due to the addition of zirconia, it is difficult to grow potassium sodium niobate-bismuth sodium zirconate single crystal by the commonly used crystal growth method, the crystal crystallization is poor, the crystal size is small (usually below 5mm) and there are many cracks

Method used

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  • Potassium sodium niobate-bismuth sodium zirconate lead-free piezoelectric single crystal and its growth method
  • Potassium sodium niobate-bismuth sodium zirconate lead-free piezoelectric single crystal and its growth method
  • Potassium sodium niobate-bismuth sodium zirconate lead-free piezoelectric single crystal and its growth method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0046] Embodiments 1-4 Crucible drop method growth (1-y) (KxNa1-x) NbO3-y (Bi0.5Na0.5) ZrO3. Among them, some process parameters are shown in Table 1.

[0047] 1. Weigh K according to the stoichiometric ratio of (1-y)(KxNa1-x)NbO3-y(Bi0.5Na0.5)ZrO3 2 CO 3 , Na 2 CO 3 , Nb 2 o 5 , Bi 2 o 3 , ZrO 2 raw powder.

[0048] 2. Weigh the growth aid and mix it evenly with the raw materials. The mixing method adopts ball milling, using corundum balls as the ball milling medium, the molar ratio of raw materials and ball milling medium is 4:1, the ball milling time is 30min, ball milling is done 3 times, and a uniformly mixed powder is obtained after ball milling.

[0049] 3. Calcining the evenly mixed powder to obtain the calcined material for crystal growth: the calcining temperature is 800° C., and the holding time is 4 hours.

[0050] Fourth, put the pre-fired material into the platinum crucible, install the crucible in the downtube of the alumina ceramic crucible, and then...

Embodiment 1

[0057] The potassium sodium niobate-based lead-free piezoelectric single crystal obtained in Example 1 was ground into powder, and its structure was analyzed by X-ray diffraction. figure 2 It can be seen that the potassium sodium niobate-based lead-free piezoelectric single crystal is a pure perovskite structure without other impurity phases.

[0058] The dielectric temperature curves of the potassium sodium niobate-based lead-free piezoelectric single crystal obtained in Test Example 1 at different frequencies are as follows: image 3 shown, from image 3 It can be seen that there are two dielectric abnormal peaks at all frequencies, corresponding to the orthorhombic-tetragonal phase transition (99°C) and the tetragonal-cubic phase transition (Curie temperature peak, 320°C), respectively. Finally, its piezoelectric performance was tested, and its piezoelectric constant can reach up to 320pC / N. The obtained crystal phase transition temperature is low, its Curie temperature i...

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Abstract

The invention relates to a potassium sodium niobate-bismuth sodium zirconate lead-free piezoelectric single crystal and a growing method thereof. The chemical formula of the potassium sodium niobate-bismuth sodium zirconate lead-free piezoelectric single crystal is (1-y)(KxNa(1-x))NbO(3-y)(Bi0.5Na0.5)ZrO3, wherein x is larger than or equal to 0.4 and smaller than or equal to 0.6, and y is larger than or equal to 0 and smaller than or equal to 0.1. According to the method, raw materials and a growth auxiliary are mixed and presintered, and the potassium sodium niobate-bismuth sodium zirconate lead-free piezoelectric single crystal is obtained by growing with a Bridgman-Stockbarger method; the potassium sodium niobate-bismuth sodium zirconate lead-free piezoelectric single crystal growing with the Bridgman-Stockbarger method after addition of the growth auxiliary has the advantages that a nucleus is formed easily, the crystal size is larger (2-20 mm), fewer cracks are formed and the like.

Description

technical field [0001] The invention belongs to the field of piezoelectric single crystals, in particular to lead-free piezoelectric single crystals of sodium potassium niobate-sodium bismuth zirconate and a growth method thereof. Background technique [0002] Piezoelectric materials are a very important class of functional materials. Using their elastic properties, dielectric properties, piezoelectric properties, pyroelectric properties, ferroelectric properties, and optical properties, piezoelectric materials are used in ultrasonic transducers, sensors, etc. , Drives, filters, memories and other fields have been widely used. At present, the most widely used piezoelectric materials are PZT-based materials, especially relaxor ferroelectric single crystals represented by lead magnesium niobate (PMNT) and lead niobate zincate (PZNT). Although they have very high piezoelectric coefficients and electromechanical coupling coefficients, PbO (or Pb 3 o 4 ) content exceeds 60%. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B11/00
Inventor 朱秀许桂生刘锦峰田彦锋
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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