Relaxation ferroelectric material Sr4CaBiTi3Nb7O30 and preparation method thereof

A ferroelectric material and relaxation technology, which is applied in the preparation field of the relaxor ferroelectric material Sr4CaBiTi3Nb7O30, achieves the effect of simple preparation process, low leakage current, and strong room temperature ferroelectricity

Inactive Publication Date: 2014-05-28
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Currently through high temperature sintering in A 1 Synthesis of ceramic

Method used

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  • Relaxation ferroelectric material Sr4CaBiTi3Nb7O30 and preparation method thereof
  • Relaxation ferroelectric material Sr4CaBiTi3Nb7O30 and preparation method thereof
  • Relaxation ferroelectric material Sr4CaBiTi3Nb7O30 and preparation method thereof

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Embodiment Construction

[0018] Specific embodiments of the present invention use the traditional solid phase method to prepare the ferroelectric ceramic sample Sr through pre-sintering and sintering. 4 CaBiTi 3 Nb 7 o 30 , including the following steps:

[0019] The first step, weigh the solid powder SrCO 3 , CaCO3, Bi 2 o 3 、TiO 2 , Nb 2 o 5 , and their stoichiometric amounts are 0.12, 0.03, 0.015, 0.09, and 0.105 mol, respectively. After thorough mixing, add absolute ethanol and ball mill for 20-30 hours.

[0020] In the second step, the resulting mixed solution is added to absolute ethanol and completely sucked out from the ball mill jar into a beaker. Put the beaker containing the mixed solution into an oven, and bake at 110° C. for 10 hours to obtain a solid mixture. The solid mixture obtained above was put into a mortar and ground for 2 hours to obtain a solid powder mixture. The resulting mixture was transferred to an alumina crucible, and placed in a programmed furnace, pre-fired a...

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Abstract

The invention relates to the technical field of ferroelectric material preparation, and discloses a relaxation ferroelectric material Sr4CaBiTi3Nb7O30 synthesized through a conventional solid phase method. The relaxation ferroelectric material Sr4CaBiTi3Nb7O30 is prepared through the following steps: at room temperature, weighing powdery SrCO3, CaCO3, Bi2O3, TiO2 and Nb2O5 according to the stoichiometric ratio of 8:2:1:6:7, uniformly mixing, drying, then presintering, and performing high temperature sintering. The ceramic material has is single-phase in structure, has a relaxation characteristic above room temperature, is low in leakage current, high in breakdown voltage and strong in ferroelectricity at room temperature, and the prepared sample has the property of preferred growth along a single phase. In the preparation of the relaxation ferroelectric material Sr4CaBiTi3Nb7O30, reducing atmosphere is not required, the process is simple, the cost is low, and environmental protection, no toxicity and no pollution are achieved. The relaxation ferroelectric material has a high potential of substituting lead-based relaxation ferroelectric material used as ferroelectric photovoltaic material.

Description

technical field [0001] The invention relates to the technical field of ferroelectric ceramic materials, in particular to a relaxor ferroelectric material Sr 4 CaBiTi 3 Nb 7 o 30 method of preparation. Background technique [0002] Ferroelectric materials refer to a class of materials with ferroelectric effect. As a branch of ferroelectric materials, relaxor ferroelectrics have a wider application space due to their excellent dielectric properties. Relaxor ferroelectric material refers to a kind of ferroelectric material whose paraelectric-ferroelectric transition belongs to the diffuse phase transition, and it has ferroelectric phenomenon and relaxation phenomenon at the same time. Compared with typical ferroelectrics, a typical feature of relaxed ferroelectrics is the complex permittivity, ε*(ω)=ε'(ω)-ε"(ω), ω is the real part of the angular frequency, ε'(ω) presents a relatively wide and gentle peak with temperature variation, and the temperature T corresponding to t...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 袁松柳方玉娇龚高尚王好文郭谦朱长明
Owner HUAZHONG UNIV OF SCI & TECH
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