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A kind of antiferroelectric lead-free ceramics and its preparation method and application

An electric lead-free ceramic and antiferroelectric technology, applied in the field of antiferroelectric ceramic materials, can solve the problems of environmental and human hazards, inability to provide dielectric properties at room temperature, lead content, etc., and achieve excellent energy storage performance.

Active Publication Date: 2021-12-10
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0003] Currently reported antiferroelectric ceramics include PbZrO 3 Lead-based materials have the advantage of being usable at room temperature, but they contain lead, which is harmful to the environment and the human body; there is also antiferroelectric ceramic Bi 0.5 Na 0.5 TiO 3 base and (K,Na)NbO 3 These two ceramic materials do not contain lead and have good environmental performance, but they can only meet the needs of use under high temperature conditions, and cannot provide good dielectric properties at room temperature

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  • A kind of antiferroelectric lead-free ceramics and its preparation method and application
  • A kind of antiferroelectric lead-free ceramics and its preparation method and application
  • A kind of antiferroelectric lead-free ceramics and its preparation method and application

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[0031] The present invention also provides the preparation method of the antiferroelectric lead-free ceramics described in the above technical solution, comprising the following steps:

[0032] will Cs 2 CO 3 with Nb 2 O 5 The first ball milling, the first high temperature heat preservation, the grinding and the second high temperature heat preservation are carried out in sequence to obtain Cs 2 Nb 4 O 11 powder;

[0033] will Bi 2 O 3 , Na 2 CO 3 , BaCO 3 , TiO 2 and the Cs 2 Nb 4 O 11 The powder is sequentially subjected to second ball milling and calcination to obtain BNT-BT-CN powder;

[0034] Mixing and granulating the BNT-BT-CN powder with polyvinyl alcohol and pressing to obtain a blank;

[0035] The blanks are sintered to obtain antiferroelectric lead-free ceramics.

[0036] In the present invention, unless otherwise specified, all preparation raw materials are commercially available commodities well known to those skilled in the art.

[0037] The pre...

Embodiment 1

[0054] (1-x)(0.94(Bi 0.5 Na 0.5 )TiO 3 -0.06BaTiO 3 )-xCs 2 Nb 4 O 11 where x=0.01.

[0055] The preparation method is as follows:

[0056] The electronic grade raw material Cs 2 CO 3 with Nb 2 O 5 According to the atomic ratio in the composition of the antiferroelectric lead-free ceramic element, a total of 2 mol was weighed, and the zirconium ball was used for ball milling in a ball milling jar with absolute ethanol as the medium. for 18h; dry the ball-milled sample and place it in a crucible, then put it in a muffle furnace for 2 hours at 600 °C, then take it out for grinding to make it fully mixed, and then place the ground material in the muffle furnace Incubate at 850 °C for 2 h to obtain Cs 2 Nb 4 O 11 powder. The synthesized Cs 2 Nb 4 O 11 After drying, the samples were tested by XRD. The test results are shown in figure 1 . Depend on figure 1 It can be seen that the present invention successfully obtained the element composition of Cs 2 Nb 4 O ...

Embodiment 2

[0063] (1-x)(0.94(Bi 0.5 Na 0.5 )TiO 3 -0.06BaTiO 3 )-xCs 2 Nb 4 O 11 where x=0.02.

[0064] The preparation method is as follows:

[0065] The sintering is divided into the first sintering and the second sintering in sequence: the temperature of the first sintering is 1200°C and the time is 5min; the temperature of the second sintering is 1150°C and the time is 6h;

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Abstract

The invention belongs to the technical field of antiferroelectric ceramic materials, in particular to an antiferroelectric lead-free ceramic and its preparation method and application. The invention provides a kind of antiferroelectric lead-free ceramics, its element composition is (1-x)(0.94(Bi 0.5 Na 0.5 )TiO 3 ‑0.06BaTiO 3 )‑xCs 2 Nb 4 o 11 , x is mole percent. The present invention consists of design elements, especially to ensure that Cs 2 Nb 4 o 11 In case of component form, realize Cs 2 Nb 4 o 11 with 0.94 (Bi 0.5 Na 0.5 )TiO 3 ‑0.06BaTiO 3 The components are combined to obtain an environmentally friendly ceramic material with antiferroelectric properties at room temperature and low electric field. Experimental data shows that the energy storage density of the antiferroelectric lead-free ceramics provided by the present invention can reach 0.70J / cm 3 , the energy storage efficiency can reach 45%, and has excellent energy storage performance.

Description

technical field [0001] The invention belongs to the technical field of antiferroelectric ceramic materials, and particularly relates to an antiferroelectric lead-free ceramic and a preparation method and application thereof. Background technique [0002] With the progress of society and the rapid development of economy, the demand for energy is increasing day by day. Therefore, the development and storage of new energy has become a hotspot in research and application. Dielectric capacitors have the advantages of light weight, high efficiency, environmental friendliness, and high specific power, and have been widely used in many fields. High energy storage density, high energy storage efficiency and fast charging and discharging materials are the material basis for high power density and large capacity capacitors. At present, a variety of dielectric materials have been studied and applied to high-density energy storage, which are generally divided into ferroelectric material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622
CPCC04B35/475C04B35/622C04B2235/81C04B2235/3232C04B2235/3201C04B2235/3236C04B2235/3255C04B2235/3224
Inventor 霍子伟许积文饶光辉王华孙亚兵杨玲
Owner GUILIN UNIV OF ELECTRONIC TECH
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