Method for controlling orientation of electrodeformation of ferroelectric single crystal

A ferroelectric single crystal and electro-deformation technology, which is applied in the field of ferroelectric materials, can solve the problems of practical inconvenience and achieve the effect of increasing the ratio, multiple control methods, and increasing the probability of occurrence

Active Publication Date: 2016-01-20
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operating voltage of this control method is limited in a very narrow range, which is very inconvenient for practical use; more importantly, the direction of the strain in the 90-degree rotation in the plane is also uncertain in advance.

Method used

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  • Method for controlling orientation of electrodeformation of ferroelectric single crystal
  • Method for controlling orientation of electrodeformation of ferroelectric single crystal
  • Method for controlling orientation of electrodeformation of ferroelectric single crystal

Examples

Experimental program
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Embodiment 1

[0050] ①, figure 2 A schematic diagram of the spontaneous polarization direction in the (001) orientation PMN-0.25PT trigonal ferroelectric single crystal selected for use in Example 1 of the present invention, as figure 2 As shown, the trigonal lead magnesium niobate titanate Pb(Mg 1 / 3 Nb 2 / 3 ) 0.75 Ti 0.25 o 3 (abbreviated as PMN-0.25PT) is a representative of the tripartite ferroelectric single crystal, and its surface is the (001) crystal plane.

[0051] ②. The (001) plane of the PMN-0.25PT single crystal selected in ① is beveled in one direction along the [010] direction, and the bevel angle is 14 degrees, and the beveled single crystal is obtained, as shown in image 3 as shown, image 3 It is a schematic diagram of a single-crystal (001) PMN-0.25PT ferroelectric in Example 1 of the present invention after being bevelled in one direction.

[0052] The chamfered PMN-0.25PT single crystal was subjected to conventional double-sided polishing and cutting, and the si...

Embodiment 2

[0058] ①. The (001) plane of the selected PMN-0.25PT single crystal is obliquely cut in both directions, that is, it is first beveled along the [010] direction by 14 degrees, and then beveled by 1.5 degrees along the [100] direction to obtain the beveled single crystal, such as Figure 7 as shown, Figure 7 It is a schematic diagram of a single crystal (001) PMN-0.25PT ferroelectric in Example 2 of the present invention after bidirectional beveling is performed.

[0059]The chamfered PMN-0.25PT single crystal was subjected to conventional double-sided polishing and cutting, and the size of the obtained test sample was 5mm*5mm*0.5mm.

[0060] ②. For the obliquely cut PMN-0.25PT single crystal test sample after ① polishing, the upper electrode layer is evaporated on both sides, such as Figure 8 as shown, Figure 8 It is a schematic diagram of the PMN-0.25PT ferroelectric with two-way chamfering in Example 2 of the present invention after two electrodes are plated. Among the...

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Abstract

The invention provides a method for controlling orientation of electrodeformation of a ferroelectric single crystal. The method for controlling the orientation of the electrodeformation of the ferroelectric single crystal comprises the following steps: bevelling (001) surface of a trigonal ferroelectric single crystal, so as to obtain bevelled single crystal; and initially polarizing the bevelled single crystal in the presence of an external electric field, and then polarizing in the presence of an external reverse electric field, so as to obtain reversely polarized single crystal. The method for controlling the orientation of the electrodeformation of the ferroelectric single crystal has the advantages that the (001) surface of the trigonal ferroelectric single crystal is treated by adopting a bevelling way, so that the surface of the single crystal is not strict (001) in orientation, and ratio of polarization overturn at 109 degrees can be increased when an electric field is turned over up and down. The method for controlling the orientation of the electrodeformation of the ferroelectric single crystal has the advantages that a simple bevelling technology is carried out on a (001)-oriented trigonal ferroelectric single crystal, so that surface normal and a crystal axis are not coincided, symmetry about the surface normal in spontaneous polarization direction is destroyed, and occurrence probability of 109-degree polarization overturn is improved, so that control on the orientation of the electrodeformation is realized. The method for controlling the orientation of the electrodeformation of the ferroelectric single crystal has the advantages that warming-assisted polarization is preferred, a single 109-degree domain rotation path can be realized, and an application of ferromagnetic thin film/piezoelectric single crystal heterojunction equal strain regulation is facilitated.

Description

technical field [0001] The invention relates to the technical field of ferroelectric materials, in particular to a method for controlling the electro-induced deformation orientation of a ferroelectric single crystal. Background technique [0002] Some crystals have spontaneous polarization within a certain temperature range, and the direction of their spontaneous polarization can be reversed with the direction of the external electric field. This property is called ferroelectricity, and crystals with ferroelectricity are called ferroelectricity. Body (or ferroelectric material, ferroelectric material). Ferroelectric materials have broad applications in energy conversion and information storage due to their nonvolatile ferroelectric polarization and piezoelectric / inverse piezoelectric effects. In recent years, the research on thin film strain regulation and the rise of composite magnetoelectric materials have brought important potential scenarios for the application of ferro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B33/04B28D5/00
Inventor 罗震林赵江涛何浩杨远俊高琛
Owner UNIV OF SCI & TECH OF CHINA
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