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A kind of sodium bismuth titanate-sodium tantalate solid solution ceramic material and its preparation method and application

A technology of sodium bismuth titanate and ceramic materials, applied in fixed capacitors, components of fixed capacitors, dielectrics of fixed capacitors, etc., can solve problems such as limited temperature stability range, and achieve excellent energy storage characteristics, uniform grain size, and crystallinity. good effect

Active Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy storage density of most BNT-based ceramics is still below 4 J / cm 3 , and the temperature stability range is limited to room temperature-200°C, so it is urgent to further improve the energy storage density of BNT-based ceramics and broaden the temperature stability range

Method used

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  • A kind of sodium bismuth titanate-sodium tantalate solid solution ceramic material and its preparation method and application
  • A kind of sodium bismuth titanate-sodium tantalate solid solution ceramic material and its preparation method and application
  • A kind of sodium bismuth titanate-sodium tantalate solid solution ceramic material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of 0.80BNT-0.20NT Ceramic Materials

[0053] According to 0.80Bi 0.5 Na 0.5 TiO 3 -0.20NaTaO 3 The molar stoichiometric ratio of (0.80BNT-0.20NT) takes raw material Bi 2 o 3 , Na 2 CO 3 , Ta 2 o 5 and TiO 2 Mix evenly, put the prepared material into a nylon tank with absolute ethanol as the medium and zirconia balls as the balls for ball milling, and ball mill for 8 hours at a speed of 250r / min. Then the ball-milled slurry was dried at 80°C. The dried powder was passed through a 200-mesh sieve, placed in an alumina crucible, and pre-fired at 800°C for 3 hours to obtain a pre-fired powder. Put the calcined powder into a nylon jar with absolute ethanol as the medium and zirconia balls as the balls for ball milling, ball mill for 24 hours at a speed of 250r / min, and then dry at 80°C. After sieving the above-mentioned powder, add polyvinyl butyral (PVA) with a mass fraction of 1%, fully grind until the powder is granular, and obtain a powder with uni...

Embodiment 2

[0066] Compared with Example 1, the only difference is that x is 0.10. The prepared ceramic is still a pure perovskite structure, without impurity phase, showing a pseudo-cubic phase structure, and the ceramic has no obvious defects, good crystallinity, uniform grain size and an average grain size of about 2-4 μm. However, the ceramic dielectric spectrum shows that its dielectric constant fluctuates (Δε r / ε r25℃ ) below 10% of the temperature range is only -15 ~ 80 ℃; at the same time, its hysteresis loop hysteresis is relatively large, although P max The value is larger, but at the same time P r The value is also large, and the anti-breakdown electric field is only 18kV / mm, resulting in its W D 2.15J / cm 3 , η is 56.5%.

Embodiment 3

[0068] Compared with Example 1, the only difference is that x is 0.30. The prepared ceramic is still a pure perovskite structure, without impurity phase, showing a pseudo-cubic phase structure, and the ceramic has no obvious defects, good crystallinity, uniform grain size and an average grain size of about 2-4 μm. The temperature stability of its dielectric constant is good, and the dielectric constant is floating (Δε r / ε r25℃ ) below 10% of the temperature range is -60 ~ 308 ℃, the electric field against breakdown is as high as 38kV / mm, the hysteresis loop is thin and long, P r value is low, but its P max value is too low, causing W D decreased to 3.16J / cm 3 , η is higher at 82.5%.

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Abstract

The invention discloses a sodium bismuth titanate-sodium tantanate solid solution ceramic material having wide-temperature stability, and with a general chemical formula of (1-x)Bi<0.5>Na<0.5>TiO<3-x>NaTaO3, with the x being 0.10-0.30. The invention also discloses preparation of the ceramic material and use of the ceramic material in dielectric capacitors. Research found that: under an applied electric field of 38 kV / mm, the ceramic material can achieve a discharge energy density of up to 4.21 J / cm<3>, a storage density of up to 5.41 J / cm<3>, and an energy storage efficiency of up to 77.8%; the ceramic material has excellent temperature stability in dielectric and energy storage performance, namely the dielectric constant fluctuates within a range of less than 10% in the temperature rangeof -50 DEG C to 350 DEG C and the discharge energy density fluctuates within a range of less than 10% in the temperature range of -50 DEG C to 300 DEG. The ceramic material is particularly suitable for high electric fields and high-low temperature dielectric energy storage capacitors.

Description

technical field [0001] The invention relates to a bismuth sodium titanate-sodium tantalate solid solution ceramic material with wide temperature stability, a preparation method and application thereof, and belongs to the technical field of lead-free ferroelectric ceramics. Background technique [0002] To meet the increasing demands of power systems and electronic devices, high-power energy storage materials have received extensive attention in recent years. Among numerous energy storage devices, dielectric capacitors have obvious advantages of high power density, fast charge-discharge rate, and excellent durability compared with batteries and supercapacitors, and are especially suitable for weapons, hybrid electric vehicles, and power electronics, etc. However, its low energy storage density is far from meeting people's requirements for miniaturization and integration of energy storage devices. In recent years, research on dielectric ceramic energy storage capacitors has r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/64H01G4/12
CPCC04B35/475C04B35/622C04B35/64C04B2235/3201C04B2235/3234C04B2235/3255C04B2235/6562C04B2235/6567C04B2235/786H01G4/1218H01G4/1254
Inventor 张斗周学凡祁核罗行
Owner CENT SOUTH UNIV
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