Sodium bismuth titanate-based relaxor ferroelectric ceramic material with wide temperature range, high electrocaloric effect and low field and high electrocaloric strength and preparation method of sodium bismuth titanate-based relaxor ferroelectric ceramic material

A technology of bismuth sodium titanate base and ferroelectric ceramics, which is applied in the field of electronic functional materials and devices, can solve the problems of lead-containing materials, measured electric card temperature variable electric card strength, harmful to human body, etc., and achieves wide service temperature range, Low preparation cost and good stability

Active Publication Date: 2021-04-09
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN201410474671.1 discloses a method for improving the performance of dielectric electric card ceramic refrigeration equipment. The patent uses BaTiO 3 and bismuth-based PbTiO 3 The electric card device was obtained by forming a multi-layer structure, but this patent is only the design method of the electric card refrigeration device, and there is no breakthrough research from the perspective of a single material, and there is no actual test to measure the temperature change and stre...

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  • Sodium bismuth titanate-based relaxor ferroelectric ceramic material with wide temperature range, high electrocaloric effect and low field and high electrocaloric strength and preparation method of sodium bismuth titanate-based relaxor ferroelectric ceramic material
  • Sodium bismuth titanate-based relaxor ferroelectric ceramic material with wide temperature range, high electrocaloric effect and low field and high electrocaloric strength and preparation method of sodium bismuth titanate-based relaxor ferroelectric ceramic material
  • Sodium bismuth titanate-based relaxor ferroelectric ceramic material with wide temperature range, high electrocaloric effect and low field and high electrocaloric strength and preparation method of sodium bismuth titanate-based relaxor ferroelectric ceramic material

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preparation example Construction

[0038] The preparation method of the above bismuth sodium titanate based relaxor ferroelectric ceramic material comprises the following steps:

[0039] S1, select Bi with a purity greater than 99% 2 o 3 、Na 2 CO 3 、K 2 CO 3 , SrCO 3 、TiO 2 and Nb 2 o 5 As the raw material of bismuth sodium titanate-based relaxor ferroelectric ceramics, weigh and mix according to the above general chemical formula to obtain primary mixed powder;

[0040] S2, add absolute ethanol and zirconia grinding balls into the nylon tank as the ball milling medium, then add the primary mixed powder, and transfer to the planetary ball mill for 10-12h of ball milling, and place the material at 80-120°C after discharge drying in a blast drying box to obtain dried powder;

[0041] S3, transferring the dried powder to a muffle furnace, and pre-sintering at 800-900°C (preferably 850°C) for 3-4 hours to obtain the pre-sintered powder;

[0042] S4, adopt the same method as step 2) to carry out the secon...

Embodiment 1

[0047] A bismuth sodium titanate-based relaxor ferroelectric ceramic material with a wide temperature range, high electric card effect and high electric card strength, its general chemical formula is (Bi 0.5 Na 0.435 K 0.065 ) 0.92 Sr 0.08 Ti 0.99 Nb 0.01 o 3 , i.e. x=0.005, its preparation method is:

[0048] S1, select Bi with a purity greater than 99% 2 o 3 、Na 2 CO 3 、K 2 CO 3 , SrCO 3 、TiO 2 and Nb 2 o 5 As the raw material of bismuth sodium titanate-based relaxor ferroelectric ceramics, weigh and mix according to the stoichiometric ratio in the above general chemical formula to obtain the primary mixed powder;

[0049] S2, add absolute ethanol and zirconia grinding balls into the nylon tank as the ball milling medium, then add the primary mixed powder, and transfer to the planetary ball mill for 12h primary ball milling, and place the material in a blast at 100°C Dried in a drying box to obtain dried powder;

[0050]S3, put the dried powder into a corun...

Embodiment 2

[0065] A bismuth sodium titanate-based relaxor ferroelectric ceramic material with a wide temperature range, high electric card effect and high electric card strength, its general chemical formula is (Bi 0.5 Na 0.428 K 0.072 ) 0.92 Sr 0.08 Ti 0.99 Nb 0.01 o 3 , i.e. x=0.012, its preparation method is:

[0066] S1, select Bi with a purity greater than 99% 2 o 3 、Na 2 CO 3 、K 2 CO 3 , SrCO 3 、TiO 2 and Nb 2 o 5 As the raw material of bismuth sodium titanate-based relaxor ferroelectric ceramics, weigh and mix according to the stoichiometric ratio in the above general chemical formula to obtain the primary mixed powder;

[0067] S2, add absolute ethanol and zirconia grinding balls into the nylon tank as the ball milling medium, then add the primary mixed powder, and transfer to the planetary ball mill for 12h primary ball milling, and place the material in a blast at 100°C Dried in a drying oven to obtain dried powder;

[0068] S3, put the dried powder into a cor...

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Abstract

The invention relates to a sodium bismuth titanate-based relaxor ferroelectric ceramic material with wide temperature range, high electrocaloric effect and high electrocaloric strength and a preparation method of the sodium bismuth titanate-based relaxor ferroelectric ceramic material, wherein the ceramic material conforms to a chemical general formula (Bi0.5Na0.44-xK0.06+x)0.92Sr0.08Ti0.99Nb0.01O3. The preparation method comprises the following steps: according to the chemical general formula,mixing the raw materials, and sequentially carrying out primary ball milling, discharging, drying, presintering, secondary ball milling, granulation, compression molding, rubber discharging and sintering to obtain the ceramic material. Compared with the prior art, the novel sodium bismuth titanate-based relaxor ferroelectric ceramic material provided by the invention is used as a lead-free material, and the ceramic electrocaloric refrigeration material meets the requirements of environmental protection and has the advantages of low preparation cost and good stability; and the high electrocaloric effect and the wide-temperature-range high electrocaloric effect under the low electric field have huge application prospects in the aspect of solid refrigeration.

Description

technical field [0001] The invention belongs to the technical field of electronic functional materials and devices, and relates to a novel bismuth sodium titanate-based relaxor ferroelectric ceramic material with a wide temperature range, high electric card effect and high electric card strength and a preparation method thereof, in particular to a ( Bi 0.5 Na 0.44- x K 0.06+x ) 0.92 Sr 0.08 Ti 0.99 Nb 0.01 o 3 Electric card effect of lead-free relaxor ferroelectric ceramics and its preparation method. Background technique [0002] Traditional air-conditioning and refrigeration systems are designed according to the theory of compressor refrigeration and rely on refrigerants such as freon or chlorofluorocarbons (CFCs) to drive. When the refrigerant volatilizes into the atmospheric ozone layer, it can catalyze the reaction of ozone, which greatly reduces the ultraviolet radiation barrier ability of the ozone layer. In order to reduce the damage to the ozone layer, peo...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/634C04B35/638C04B35/64
CPCC04B35/475C04B35/63416C04B35/64C04B35/638C04B2235/3298C04B2235/442C04B2235/3251C04B2235/6562C04B2235/6567C04B2235/96
Inventor 沈波李国辉翟继卫
Owner TONGJI UNIV
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