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Bismuth sodium potassium titanate series nonlead ferroelectric piezoelectric monocrystal and its growing method and equipment

A technology of bismuth sodium potassium titanate and bismuth sodium titanate, which is applied in the field of perovskite type non-lead iron voltage electric single crystal, bismuth sodium potassium titanate solid solution single crystal and its growth field, can solve the problem of crystal quality imperfection, Piezoelectric ferroelectric performance is not good and other problems, to achieve the effect of lowering temperature, structural integrity, and maintaining uniformity

Inactive Publication Date: 2007-03-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 1991, Y. Hosono et al. of Japan carried out crystal growth on the sodium bismuth titanate-barium titanate (NBT-BT) system using the Bridge method and the flux method, but the quality of the grown crystals was not perfect, piezoelectric ferroelectric poor performance

Method used

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  • Bismuth sodium potassium titanate series nonlead ferroelectric piezoelectric monocrystal and its growing method and equipment
  • Bismuth sodium potassium titanate series nonlead ferroelectric piezoelectric monocrystal and its growing method and equipment
  • Bismuth sodium potassium titanate series nonlead ferroelectric piezoelectric monocrystal and its growing method and equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: x = 0.10, bismuth sodium potassium titanate series non-lead iron piezoelectric single crystal molecular formula Na 0.45 K 0.05 Bi 0.5 TiO 3

[0036] The growth equipment is an improved single crystal growth furnace, including seed rod 1, alumina ceramic hollow tube 2, observation window 3, aluminum silicate refractory insulation cover 4, platinum rod 10, alumina ceramic sheet 6, platinum crucible 7, oxidation Aluminum ceramic ceramic crucible 13, aluminum silicate zirconium refractory cotton 8, furnace body 5, resistance wire heater 9, thermocouple 12, put alumina ceramic hollow tube 2 in place 4 of aluminum silicate refractory heat preservation cover, and pass through buoy type oxygen The inhaler feeds industrial oxygen at room temperature into the alumina ceramic hollow tube 2 . As shown in Figure 1.

[0037] The preparation method is as follows:

[0038] (1) When x=0.10, weigh 22.43 grams of Na 2 CO 3 , according to Na 2 CO 3 : K 2 CO 3 : Bi 2...

Embodiment 2

[0041] Example 2: x=0.05, bismuth sodium potassium titanate series non-lead-iron voltage electric single crystal (Na 0.95 K 0.05 ) 0.5 Bi 0.5 TiO 3

[0042] The crystal growth equipment and method are the same as those described in Example 1.

Embodiment 3

[0043] Embodiment 3: x=0.3, bismuth sodium potassium titanate crystal molecular formula (Na 0.70 K 0.30 ) 0.5 Bi 0.5 TiO 3

[0044] The crystal growth equipment and method are the same as those described in Example 1. The resulting crystal is shown in Figure 3, and the measured piezoelectric coefficient d of the crystal 33 =165pC / N, much larger than the piezoelectric coefficient (d 33 =96pC / N)

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Abstract

A bismuth sodium potassium titanate series non-PbFe piezoelectric crystal has a molecular formula: (Na1-xKx)0.5 Bi0.5TiOe, where x=0-1.0. Said BNKT monocrystal is prepared through proportionally mixing Bi2O5, Na2CO3, and K2CO3, pretreating, using the self-nuclear growing BNTK sosoloid monocrystal as seed, and growing by self-service flux method. Applying the cold wind to its growing furnace can increase the drive force of growing monocrystal, resulting in large size.

Description

(1) Technical field [0001] The invention relates to crystal growth technology, in particular to a perovskite-type non-lead-iron piezoelectric single crystal-bismuth sodium potassium titanate solid solution single crystal and a growth method thereof, belonging to the technical field of crystal growth. (2) Background technology [0002] In today's society, environmental and energy issues have been recognized and gradually paid attention to. As one of the three pillars of human society in this century and in the future, material science is also closely related to energy and the environment. As an important part of functional materials, piezoelectric ferroelectric materials play an important role in the development of national economy. The research on piezoelectric materials started in the nineteenth century, and after a century of development, it has formed a considerable scale. Microphones and speakers etc. on most electronics. At present, the widely used piezoelectric mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/32C30B11/00
Inventor 仪修杰陈焕矗韩建儒赵明磊
Owner SHANDONG UNIV