Method for producing relaxor ferroelectric single crystal PMN-PT by using vertical freezing technology

A technology of relaxor ferroelectric single crystal and production method, which is applied in the field of ceramic crystallization and can solve the problems of high cost and complex structure.

Inactive Publication Date: 2015-07-29
SHANGHAI YIYING NEW MATERIAL SCI & TECHCO
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  • Abstract
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Problems solved by technology

This method not only needs to control the furnace temperature, but also controls the lowering speed of the crucible, the structure is more complicated, and the cost is also higher.

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  • Method for producing relaxor ferroelectric single crystal PMN-PT by using vertical freezing technology
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  • Method for producing relaxor ferroelectric single crystal PMN-PT by using vertical freezing technology

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Embodiment Construction

[0013] Referring to accompanying drawing, compare vertical solidification method to grow PMN-PT crystal ( figure 1 ) and the traditional Bridge drop method to grow PMN-PT crystals ( figure 2 ) similarities and differences: the first, in the vertical solidification method, the crystal crucible (22) does not do mechanical movement relative to the electric furnace heater (31); 31) Vertical downward movement (300); second, in the vertical solidification method, the electric furnace has more than 3 sets of heaters (31) independently controlled, so that the same crystallization temperature zone curve (100) can be obtained in different time periods of crystallization (t 1 , t 2 , t 3 ...) moves vertically upwards relative to the electric furnace heater (31); and in the Bridge descent method, there is usually only one group of heaters (31), and the crystallization temperature zone curve (200) formed will not change over time Change. In summary, the vertical solidification method...

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Abstract

Systems and methods are provided for preparing multi-component ferroelectric crystals (e.g., PMN-PT, amongst others) having piezoelectric properties. The crystals are fabricated using a system that employs multiple heaters and sensors that are located along the length of a crystal growth chamber. The heaters are controlled in concert, via a feedback system, to produce a temperature profile having a gradient that effectively moves along the length of the chamber, to suitably effectuate crystallization throughout the chamber, without need for the chamber to translate relative to the heater(s). During the crystallization process, the contents of the chamber may be mixed and/or homogenized via suitable agitation thereof, resulting in a multi-component ferroelectric crystal of desirable quality.

Description

technical field [0001] The invention relates to ceramic crystallization technology and crystal growth technology; the technology is suitable for the industrialized production of binary system crystal lead magnesium niobate-lead titanate (PMN-PT) crystal, compared with the traditional Bridgman method (Bridgman), vertical solidification method ( V Ertical Gradient Freeze) growth furnace configuration is simpler and lower cost. Background technique [0002] Piezoelectric materials can convert electrical energy and mechanical energy to transmit and receive ultrasonic signals, and are the core components of ultrasonic probes. In recent years, a relaxor ferroelectric single crystal lead magnesium niobate-lead titanate (abbreviated as PMN-PT) crystal has begun to be used in the field of medical ultrasound imaging. When the chemical composition of lead titanate PT is close to the MPB phase boundary (25-35% PT), the electromechanical coupling coefficient (k33) of the crystal can re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B11/00
CPCC30B11/003C30B29/30C30B11/006C30B29/32Y10T117/1008C30B29/22C30B11/00
Inventor 不公告发明人
Owner SHANGHAI YIYING NEW MATERIAL SCI & TECHCO
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