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A BaTiO 3 /Ba(Fe 0.5 Nb 0.5 )O 3 Layered ferroelectric composite material and its preparation method

A composite material and ferroelectric technology, applied in the field of material science, can solve problems such as hindering the application of giant dielectric constant materials and large dielectric loss, and achieve the effects of good compactness, reduced dielectric loss, and uniform grain size.

Active Publication Date: 2016-08-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still obvious shortcomings in the application of this type of ceramics, such as large dielectric loss at room temperature, which is the key to hindering the practical application of materials with a large dielectric constant.

Method used

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  • A BaTiO <sub>3</sub> /Ba(Fe <sub>0.5</sub> Nb <sub>0.5</sub> )O <sub>3</sub> Layered ferroelectric composite material and its preparation method
  • A BaTiO <sub>3</sub> /Ba(Fe <sub>0.5</sub> Nb <sub>0.5</sub> )O <sub>3</sub> Layered ferroelectric composite material and its preparation method
  • A BaTiO <sub>3</sub> /Ba(Fe <sub>0.5</sub> Nb <sub>0.5</sub> )O <sub>3</sub> Layered ferroelectric composite material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0034] a BaTiO 3 / Ba(Fe 0.5 Nb 0.5 )O 3 The chemical formula of the layered ferroelectric composite is xBa(Fe 0.5 Nb 0.5 )O 3 / (1-x)BaTiO 3 , where x is Ba(Fe 0.5 Nb 0.5 )O 3 The mass percentage of x=11.1%.

[0035] The aforementioned BaTiO 3 / Ba(Fe 0.5 Nb 0.5 )O 3 A method for preparing a layered ferroelectric composite material, comprising the following steps:

[0036] 1) According to the chemical formula Ba(Fe 0.5 Nb 0.5 )O 3 will analyze pure BaCO 3 , Fe 2 o 3 , Nb 2 o 5 After the preparation, it was mixed evenly by wet ball milling for 4 hours, then dried, sieved, briquetting, and then pre-fired at 1150°C for 6 hours to obtain a block product, and then the block product was crushed and passed through a 120-mesh sieve to obtain Ba(Fe 0.5 Nb 0.5 )O 3 Powder;

[0037] 2) According to the chemical formula BaTiO 3 will analyze pure BaCO 3 、TiO 2 After preparation, it was mixed evenly by wet ball milling for 6 hours, then dried, sieved, and then pre-...

Embodiment 2

[0043] a BaTiO 3 / Ba(Fe 0.5 Nb 0.5 )O 3 The chemical formula of the layered ferroelectric composite is xBa(Fe 0.5 Nb 0.5 )O 3 / (1-x)BaTiO 3 , where x is Ba(Fe 0.5 Nb 0.5 )O 3 The mass percentage of x=22.2%.

[0044] The aforementioned BaTiO 3 / Ba(Fe 0.5 Nb 0.5 )O 3 A method for preparing a layered ferroelectric composite material, comprising the following steps:

[0045] 1) According to the chemical formula Ba(Fe 0.5 Nb 0.5 )O 3 will analyze pure BaCO 3 , Fe 2 o 3 , Nb 2 o 5 After the preparation, it was mixed evenly by wet ball milling for 5 hours, then dried, sieved, briquetting, and then pre-fired at 1200°C for 4 hours to obtain a block product, and then the block product was crushed and passed through a 120-mesh sieve to obtain Ba(Fe 0.5 Nb 0.5 )O 3 Powder;

[0046] 2) According to the chemical formula BaTiO 3 will analyze pure BaCO 3 、TiO 2 After preparation, it was mixed evenly by wet ball milling for 4 hours, then dried, sieved, and then pre-...

Embodiment 3

[0052] a BaTiO 3 / Ba(Fe 0.5 Nb 0.5 )O 3 The chemical formula of the layered ferroelectric composite is xBa(Fe 0.5 Nb 0.5 )O 3 / (1-x)BaTiO 3 , where x is Ba(Fe 0.5 Nb 0.5 )O 3 The mass percentage of x=33.3%.

[0053] The aforementioned BaTiO 3 / Ba(Fe 0.5 Nb 0.5 )O 3 A method for preparing a layered ferroelectric composite material, comprising the following steps:

[0054] 1) According to the chemical formula Ba(Fe 0.5 Nb 0.5 )O 3 will analyze pure BaCO 3 , Fe 2 o 3 , Nb 2 o 5 After preparation, it was mixed evenly by wet ball milling for 6 hours, then dried, sieved, briquetting, and then pre-fired at 1160°C for 5 hours to obtain a block product, and then the block product was crushed and passed through a 120-mesh sieve to obtain Ba(Fe 0.5 Nb 0.5 )O 3 Powder;

[0055] 2) According to the chemical formula BaTiO 3 will analyze pure BaCO 3 、TiO 2 After preparation, it was mixed evenly by wet ball milling for 5 hours, then dried, sieved, and then pre-fire...

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Abstract

A BaTiO3 / Ba(Fe0.5Nb0.5)O3 layered ferroelectric composite material and its preparation method. First, Ba(Fe0.5Nb0.5)O3 powder and BaTiO3 powder are prepared, and then the two powders are manufactured. After granulation, sieve to obtain Ba(Fe0.5Nb0.5)O3 powder and BaTiO3 powder. The two powders are then arranged in a 2-2 composite barrier layer stacking manner. After pressing and molding in the mold, the ferroelectric phase is layered. The two phases are co-fired together in a composite manner, which can effectively suppress the mutual reaction between the two phases and maintain their respective characteristics, so that the prepared composite material has better ferroelectricity and can effectively reduce its dielectric loss. The dielectric loss of the layered ferroelectric composite material produced by the invention is only 0.1 to 0.2 when the frequency is 100Hz.

Description

technical field [0001] The invention belongs to the field of material science and relates to a BaTiO 3 / Ba(Fe 0.5 Nb 0.5 )O 3 Layered ferroelectric composite material and method for its preparation. Background technique [0002] With the continuous emergence of large-scale integrated circuits and portable communication tools in electronic information equipment, ferrite devices are developing in the direction of miniaturization, miniaturization, chipping and even integration, and more and more requirements have been put forward for the dielectric properties of electronic materials. With higher requirements, it is hoped to obtain new electronic materials with superior comprehensive properties such as high dielectric coefficient, low loss, and easy processing, which is difficult to achieve in a single component. Ferroelectric composites can use fewer resources and occupy less volume. Therefore, the research and development of high-efficiency ferroelectric composite materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/468C04B35/622H10N30/853
Inventor 杨海波白路阳林营朱建锋王芬
Owner SHAANXI UNIV OF SCI & TECH