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Novel ferroelectric single-crystal lead ytterbium niobate-lead magnesium niobate-lead titanate

A lead ytterbium niobate, ferroelectric single crystal technology is applied in the fields of ferroelectric crystals, crystal growth methods, structures and electrical properties, and can solve problems such as not obvious effects, reduced piezoelectricity, etc.

Inactive Publication Date: 2011-05-11
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the effect is not very obvious
For example, Mn-doped PMN-29PT crystal improves Ec, Tc, T rt , but the piezoelectricity decreases
Although the Fe-doped PZN-4.5PT crystal improves Ec and d 33 , but Tc, T rt 20°C lower

Method used

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  • Novel ferroelectric single-crystal lead ytterbium niobate-lead magnesium niobate-lead titanate

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Embodiment Construction

[0014] 1. Growth of PYMNT ferroelectric single crystal by co-solvent method.

[0015] The initial raw materials PbO, MgO, TiO 2 , Yb 2 o 3 , Nb 2 o 5 , PbO and H are used as cosolvents 3 BO 3 or B 2 o 3 Composite co-solvent, weighed according to the proportion, mixed and ground, and compounded; heat the compounded material above the supersaturation temperature, keep the temperature constant for a certain period of time, and then slowly cool down to grow; Cool down at a rate of -20°C; during the growth process, platinum wire can be used to hang in the center of the liquid surface to form a nucleation center, reduce the number of nuclei and promote nucleation growth; after the growth is over, cool and anneal at 10-30°C / h, and then Remove the crystals. Through the X-ray powder diffraction, dielectric, ferroelectric and piezoelectric performance test and analysis of the grown crystal, its structure and performance are determined.

[0016] 2. The PYMNT ferroelectric singl...

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Abstract

The invention relates to the growth, the structures and the properties of novel ferroelectric single-crystal lead ytterbium niobate-lead magnesium niobate-lead titanate. The crystal belongs to a perovskite structure, has an MPB region and has a chemical formula of (1-x-y)Pb(Yb1 / 2Nb1 / 2)O3-xPb(Mg1 / 3Nb2 / 3)O3-yPbTiO3 which is short for PYMNT or PYN-PMN-PT. By adopting a top crystal-seeded method, the crystal with large size and high quality can grow under the conditions that the growth temperature of the crystal is 950-1100 DEG C, the crystal rotation speed is 5-30rpm, and the cooling speed is 0.2-5 DEG C / day, and the grown crystal exposes a 001 natural growth surface. Through X-ray powder diffraction, the system is confirmed as the perovskite structure; and through ferroelectric, dielectric and piezoelectric measurement, the ferroelectricity, the dielectric property and the piezoelectricity of the crystal are analyzed. The crystal has high Curie temperature and trigonal-tetragonal phase transition temperature, large piezoelectric constant and electromechanical coupling factor, high dielectric constant and low dielectric loss and better heat stability. The crystal can be widely applied to devices in the piezoelectric fields of ultrasonically medical imaging, sonar probes, actuators, ultrasonic motors, and the like.

Description

Technical field: [0001] The invention relates to the field of novel functional materials, in particular to a ferroelectric crystal. Specifically, the invention relates to a ferroelectric single crystal material with a quasi-isotype phase boundary MPB structure and a relatively high Curie temperature, as well as the growth method, structure and electrical properties of the crystal. Background technique: [0002] Due to their excellent properties, ferroelectric materials have a wide range of practical applications in medicine, national defense, and civil applications. BaTiO was discovered in the 1940s 3 Piezoelectric materials, Pb(Zr) was discovered in the 1950s 1-x Ti x )O 3 Abbreviated as PZT. PZT ceramic material is a traditional piezoelectric material widely used in transducers and actuators, and has always occupied a dominant position in piezoelectric applications. There is a morphotropic phase boundary in this material, abbreviated as MPB. PZT exhibits high dielec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B29/30C30B9/06
Inventor 龙西法何超李修芝王祖建
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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