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Electronic type ferroelectric material and preparation method thereof

A ferroelectric material, electronic technology, applied in the field of electronic ferroelectric materials, can solve problems such as limiting the controllability of materials

Inactive Publication Date: 2010-08-25
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

LuFe 2 o 4 The material is a relaxor ferroelectric with a high dielectric constant, but it must be in a certain temperature range near room temperature to have this characteristic, which relatively limits the controllability of the material's practical application

Method used

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  • Electronic type ferroelectric material and preparation method thereof
  • Electronic type ferroelectric material and preparation method thereof
  • Electronic type ferroelectric material and preparation method thereof

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Experimental program
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Embodiment

[0023] First put Lu 2 o 3 and Fe 2 o 3 Batching, so that the atomic ratio of elements Lu and Fe is 2:3; after mixing evenly, carry out the first compression molding; the first compression molding sample is in the air at the first temperature in the temperature range of 1100-1400 ° C (specifically 1100°C, 1150°C, 1200°C, 1250°C, 1300°C, 1350°C or 1400°C), pre-sintering for 24-72 hours (specifically 24 hours, 48 ​​hours or 72 hours); the sintered sample Grind evenly and press for the second time; in a redox atmosphere where the molar ratio of carbon dioxide gas to hydrogen is any value in the range of 8-10 (specifically 8, 9, 10), the sample that is pressed for the second time Sintering at a second temperature (specifically 1100°C, 1150°C, 1200°C, 1250°C, 1300°C, 1350°C or 1400°C) in the temperature range of 1100-1400°C for 24-72 hours (specifically 24 hours, 48 hours or 72 hours), wherein the oxidizing gas is carbon dioxide gas, and the reducing gas is hydrogen; then lower ...

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Abstract

The present invention discloses an electronic ferroelectric material and the preparing method thereof, the ferroelectric material is the compound of Lu2Fe3O7, the unit cell of the compound is a laminar structure and is composed by alternately arranging a ferrite single layer, a lutetium-oxygen layer and a ferrite double layer, the Fe in the ferrite double layer exists with a mixed valence in the compound and forms a triangle frustrated structure. The ferroelectric material is obtained by the techniques of mixing Lu2O3 and the Fe2O3 mixture, a first pressing molding, a presintering, a second presintering, a sintering and a quick quenching, and the material has high dielectric constant in the vicinity of the room temperature.

Description

technical field [0001] The invention relates to an electronic ferroelectric material and a method for preparing the material. Background technique [0002] As an important class of functional materials, ferroelectric materials are increasingly used in high-tech applications. Since the discovery of specific dielectric properties in Roche salt in 1920 led to the emergence of the concept of "ferroelectricity", ferroelectric materials have The wide application of ferroelectric materials has a long history, and many new ferroelectric materials have been studied during this period. However, from the microscopic mechanism of spontaneous polarization, these materials can be divided into displacement types of atoms or atomic groups and ordered and disordered materials. Type two. [0003] With the LuFe 2 o 4 In-depth study of materials, a new ferroelectric mechanism based on charge ordering was proposed, and LuFe 2 o 4 The material is defined as an electronic ferroelectric. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/50C04B35/622
Inventor 杨槐馨张颖马超田焕芳秦元斌李建奇
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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