(Na0.5Bi0.5)(1-x)BaxTi(1-x)SnxO3 ceramic and preparing method thereof

A ceramic base and ceramic material technology, applied in the field of transparent high energy storage density BaxTiSnxO3 ceramic material and its preparation, can solve the limitations of ceramic breakdown strength and light transmittance, slow diffusion rate of Sn element, difficult to prepare dielectric ceramics, etc. problem, achieve the effect of improving solid solubility, low material cost, and improving breakdown strength

Inactive Publication Date: 2018-03-30
SHAANXI UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

However, most relaxor ferroelectrics contain lead, which will cause great damage to the environment during preparation and use. Therefore, the lead-free dielectric material with high energy storage density has become an inevitable trend.
[0004] Na 0.5 Bi 0.5 TiO 3 (NBT) is due to its high polarization ( P s =43 μC / cm 2 ) are considered as candidates to replace lead-based materials, but the high polarization and high coercive field strength of NBT limit the improvement of energy storage density. In our previous work, we have confirmed that the addition of BaSnO 3 (BSN) can effectively reduce the remanent polarization and coercive field strength of NBT, but the diffusion rate of Sn element in BSN is slow, so the breakdown strength and light transmittance of ceramics are limited, and it is difficult to prepare by traditional solid-state method Dielectric ceramics with transparency and high energy storage density are produced. The invention improves the solid solubility of BSN in NBT through the method of cold isostatic pressing and microwave sintering assisted homogenization, and obtains high energy storage with uniform element distribution. Density (Na 0.5 Bi 0.5 ) (1-x) Ba x Ti (1-x) sn x o 3 ceramics

Method used

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  • (Na0.5Bi0.5)(1-x)BaxTi(1-x)SnxO3 ceramic and preparing method thereof

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preparation example Construction

[0031] A light-transmitting high energy storage density (Na 0.5 Bi 0.5 ) (1-x) Ba x Ti (1-x) sn x o 3 A method for preparing a ceramic material, comprising the steps of:

[0032] Step 1: Prepare pure-phase NBT and pure-phase BSN for later use. Weigh BaCO according to the molar ratio of 1:1 3 and SnO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 、Na 2 CO 3 and TiO 2 mixed to form mixture B; Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 、TiO 2 , SnO 2 The purity is above 99.0%.

[0033] Step 2: Mix the mixtures A and B with zirconium balls and deionized water respectively according to the mass ratio of 1:5:(0.8~1), 1:5:(1~1.2), and then use planetary ball mill for ball milling 18~24h, then dry at 85~100°C for 20~24h, after briquetting, put A and B in a box-type furnace respectively at 1150~1200°C for 2.5~3 hours, 820~840°C for 3~4 hours hours to form BSN powder and NBT powder respectively, and set aside;

[0034] Step 3: According to the chemic...

Embodiment 1

[0040] The present invention has light transmittance and high energy storage density (Na 0.5 Bi 0.5 ) (1-x) Ba x Ti (1-x) sn x o 3 The preparation method of ceramic material, its formula is (Na 0.5 Bi 0.5 ) (1-x) Ba x Ti (1-x) sn x o 3 ,in x =0.1.

[0041] Step 1: Prepare pure-phase NBT and pure-phase BSN for later use. Weigh BaCO according to the molar ratio of 1:1 3 and SnO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 、Na 2 CO 3 and TiO 2 mixed to form mixture B; Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 、TiO 2 , SnO 2 The purity is above 99.0%.

[0042] Step 2: Mix the mixtures A and B with zirconium balls and deionized water respectively according to the mass ratio of 1:5:1 and 1:5:1 respectively, then use a planetary ball mill for 24 hours, and then bake at 80°C After drying for 24 hours and briquetting, put A and B in a box-type furnace for 3 hours at 1200°C and 4 hours at 820°C respectively to form BSN powder and NBT powder ...

Embodiment 2

[0048] The present invention has light transmittance and high energy storage density (Na 0.5 Bi 0.5 ) (1-x) Ba x Ti (1-x) sn x o 3 The preparation method of ceramic material, its formula is (Na 0.5 Bi 0.5 ) (1-x) Ba x Ti (1-x) sn x o 3 ,in x =0.2.

[0049] Step 1: Prepare pure-phase NBT and pure-phase BSN for later use. Weigh BaCO according to the molar ratio of 1:1 3 and SnO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 、Na 2 CO 3 and TiO 2 mixed to form mixture B; Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 、TiO 2 , SnO 2The purity is above 99.0%.

[0050] Step 2: Mix the mixtures A and B with zirconium balls and deionized water respectively according to the mass ratio of 1:5:1 and 1:5:1 respectively, then use a planetary ball mill for 24 hours, and then bake at 80°C After drying for 24 hours and briquetting, put A and B in a box-type furnace for 3 hours at 1200°C and 4 hours at 820°C respectively to form BSN powder and NBT powder f...

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Abstract

The invention discloses a high energy-storage density (Na0.5Bi0.5)(1-x)BaxTi(1-x)SnxO3 relaxor ferroelectrics ceramic material and a preparing method thereof. Na0.5Bi0.5TiO3 powder is mixed with BaSnO3 powder to be subjected to ball milling, dried and briquetted, and a full component is formed and sieved to form a sieving material; isostatic cool pressing is utilized to obtain an isotropic compactgreen body. The prepared green body is subjected to microwave sintering to obtain a sintering sample. The invention further discloses a lead-free high energy-storage-density ceramic material preparedthrough the ceramic material and a preparing method of the lead-free high energy-storage-density ceramic material. The provided (Na0.5Bi0.5)(1-x)BaxTi(1-x)SnxO3 lead-free high energy-storage-densityceramic material has high energy-storage density, and is simple in preparing technology, low in material cost, and environmentally friendly.

Description

technical field [0001] The invention relates to the field of high energy storage dielectric ceramic capacitors, in particular to a transparent high energy storage density (Na 0.5 Bi 0.5 ) (1-x) Ba x Ti (1-x) sn x o 3 Ceramic materials and methods for their preparation. Background technique [0002] Ceramic dielectric materials are widely used in power electronic devices due to their fast charge and discharge rates, high power density, and high temperature resistance. However, the low energy storage density causes dielectric materials to occupy 25% of the volume and weight of power electronic devices. In order to reduce the volume and weight of electronic devices, it is urgent to increase the energy storage density of dielectric materials. [0003] Relaxor ferroelectrics (RFEs) have zero remanent polarization (P r ) and high saturation polarization (P s ), have received increasing attention in energy storage applications. However, most relaxor ferroelectrics contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/457C04B35/475C04B35/64
CPCC04B35/457C04B35/475C04B35/64C04B2235/3201C04B2235/3213C04B2235/3234C04B2235/3236C04B2235/3293C04B2235/6562C04B2235/6567
Inventor 蒲永平张磊
Owner SHAANXI UNIV OF SCI & TECH
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