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Novel ferroelectric ceramic barium niobate scandate -lead titanate, preparation method and application thereof

A technology of barium niobium scandate and ferroelectric ceramics is applied in the field of relaxation type ferroelectric ceramic materials to achieve the effect of high dielectric permittivity

Inactive Publication Date: 2010-01-06
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, no research reports about this system have been found at home and abroad. The purpose of the present invention is to develop a new type of ferroelectric piezoelectric ceramics, which has high dielectric permittivity, piezoelectric constant, electromechanical coupling coefficient and Curie point.

Method used

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  • Novel ferroelectric ceramic barium niobate scandate -lead titanate, preparation method and application thereof
  • Novel ferroelectric ceramic barium niobate scandate -lead titanate, preparation method and application thereof
  • Novel ferroelectric ceramic barium niobate scandate -lead titanate, preparation method and application thereof

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Embodiment Construction

[0017] 1. Synthesize 0.37Ba(Sc 1 / 2 Nb 1 / 2 )O 3 -0.63PbTiO 3 .

[0018] The initial raw material BaCO 3 , Sc 2 o 3 , Nb 2 o 5 , PbO, TiO 2 Press Ba(Sc 1 / 2 Nb 1 / 2 )O 3 and PbTiO 3 The content of the chemical formula is weighed, mixed, ground, dried, shaped, shaped at a pressure of 4MPa, and then kept at a constant temperature of 1120°C for 4 hours. After a solid-state reaction, a 0.40Ba(Sc 1 / 2 Nb 1 / 2 )O 3 -0.60PbTO 3 compound, the product is re-crushed, ground, dried, added with PVA, pressed into tablets, and then heated to 1345°C for sintering (holding temperature for 2.5 hours), which is the ferroelectric ceramic developed by the present invention. By measuring the dielectric properties of the component ceramics, the Curie point of the component ceramics is 110°C.

[0019] 2. Synthesize 0.34Ba(Sc 1 / 2 Nb 1 / 2 )O 3 -0.66PbTiO 3

[0020] The initial raw material BaCO 3 , Sc 2 o 3 , Nb 2 o 5 , PbO, TiO 2 Press Ba(Sc 1 / 2 Nb 1 / 2 )O 3 and PbTO 3 The con...

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Abstract

The invention relates to performances, preparation method and application of novel ferroelectric ceramic barium niobate scandate -lead titanate. The ceramic has a perovskite type structure and comprises the chemical formula of (1-x)Ba(Sc1 / 2Nb1 / 2)O3-xPbTO3, wherein 0 is more than or equal to 0 and less than or equal to 1. The ceramic system has a morphotropic phase boundary (MPB) with the range of more than 0.61 and less than 0.65. The ceramic can be prepared by a Columbite synthesis method or the conventional solid phase synthesis method and belongs to environment-friendly piezoelectric ceramics containing little lead.

Description

Technical field: [0001] The invention belongs to the field of relaxation type ferroelectric ceramic materials. Background technique: [0002] Relaxor ferroelectric materials have a wide range of practical applications in medicine, national defense, and civil applications due to their excellent properties. PMN-PT and PZN-PT, which have attracted much attention in recent years, are one of them. Due to its high electromechanical coupling coefficient (k 33 >90%) and ultra-high piezoelectric coefficient (d 33 >2000) and become the core piezoelectric material for a new generation of ultrasonic transducers, sensors and drivers. However, this type of material has two defects. First, the Curie temperature is low (170°C) and the MPB phase transition temperature is low (80-90°C), so it is easy to depolarize, and the temperature range for practical application is narrow; second, this Such materials contain a large amount of lead, which will cause harm to the environment and hu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/491C04B35/50C04B35/472C04B35/622
Inventor 龙西法魏倩王祖建李修芝
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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