Barium zirconate titanate-barium calciate titanate (BZT-BCT) ceramic modified by doping of lanthanum oxide and preparation method for same

A technology of barium calcium zirconate titanate and zirconia balls, which is applied in the field of functional ceramics, can solve the problems of adjusting the dielectric constant, withstand voltage characteristics, temperature stability of barium strontium titanate ceramics, and limiting the application of adjustable capacitor devices. Achieve superior temperature stability, high tuning rate, and low dielectric loss

Active Publication Date: 2012-06-27
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the materials used in adjustable capacitance devices are mainly researches on the barium strontium titanate ceramic system, but under the action of an external DC electric field, the withstand voltage characteristics

Method used

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  • Barium zirconate titanate-barium calciate titanate (BZT-BCT) ceramic modified by doping of lanthanum oxide and preparation method for same
  • Barium zirconate titanate-barium calciate titanate (BZT-BCT) ceramic modified by doping of lanthanum oxide and preparation method for same
  • Barium zirconate titanate-barium calciate titanate (BZT-BCT) ceramic modified by doping of lanthanum oxide and preparation method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Piezoelectric ceramic material, its molecular structure expression is: Ba 0.98 La 0.02 Ca 0.075 Zr 0.8995 Ti 0.0995 o 3

[0017] The steps are: put analytically pure barium carbonate, calcium carbonate, zirconia, titanium oxide and lanthanum oxide in the stoichiometric ratio Ba 1-x La x Ca 0.075 (Zr 0.9 Ti 0.1 ) 1-x / 4 o 3 Carry out batching, where x=0.02; put the prepared raw materials into the ball mill tank, add zirconia balls and absolute ethanol, the quality of the added zirconia balls is twice the mass of the raw materials, and use wet milling method for ball milling and mixing 4 hour, the rotation speed is 250 rpm; take it out and place it in an oven to dry at 80°C; put the dried powder into a crucible, raise the temperature to 1000°C at a rate of 1°C / min, and keep it warm for 1 hour; Put the calcined powder into a ball mill jar, add zirconia balls and absolute ethanol, the quality of the added zirconia balls is 4 times the mass of the raw material, an...

Embodiment 2

[0019] Piezoelectric ceramic material, its molecular structure expression is: Ba 0.96 La 0.04 Ca 0.075 Zr 0.891 Ti 0.099 o 3

[0020] The steps are: analyze pure barium carbonate, calcium carbonate, zirconia, titanium oxide and lanthanum oxide by stoichiometric Ba 1-x La x Ca 0.075 (Zr 0.9 Ti 0.1 ) 1-x / 4 o 3Carry out batching, wherein x=0.04; Put the prepared raw materials into the ball mill tank, add zirconia balls and absolute ethanol, the quality of the added zirconia balls is 4 times of the raw material quality, and use the wet milling method to carry out ball milling and mixing for 8 Hours, the rotation speed is 300 rpm; take it out and place it in an oven to dry at 100°C; put the dried powder into a crucible, raise the temperature to 1100°C at a rate of 3°C / min, and keep it warm for 3 hours; Put the calcined powder into a ball mill jar, add zirconia balls and absolute ethanol, the quality of the added zirconia balls is 5 times the mass of the raw material, an...

Embodiment 3

[0022] Piezoelectric ceramic material, its molecular structure expression is: Ba 0.94 La 0.06 Ca 0.075 Zr 0.8865 Ti 0.0985 o 3

[0023] The steps are: analyze pure barium carbonate, calcium carbonate, zirconia, titanium oxide and lanthanum oxide by stoichiometric Ba 1-x La x Ca 0.075 (Zr 0.9 Ti 0.1 ) 1-x / 4 o 3 Carry out batching, wherein x=0.06; Put the prepared raw material in the ball mill tank, add zirconia balls and absolute ethanol, the quality of the added zirconia balls is 7 times of the raw material quality, and adopt wet milling method to carry out ball milling and mixing for 10 Hours, the rotation speed is 350 rpm; take it out and place it in an oven to dry at 120°C; put the dried powder into a crucible, raise the temperature to 1150°C at a rate of 3°C / min, and keep it warm for 4 hours; Put the calcined powder into a ball mill jar, add zirconia balls and absolute ethanol, the quality of the added zirconia balls is 7 times the mass of the raw material, and...

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Abstract

The invention discloses a barium zirconate titanate-barium calciate titanate (BZT-BCT) ceramic modified by the doping of lanthanum oxide and a preparation method for the same. The molecular formula of the BZT-BCT ceramic is Ba<1-x>LaxCa0.075(Zr0.9Ti0.1)<1-x/4>O3, wherein x is not less than 0.01 and not greater than 0.1; the preparation method for the BZT-BCT ceramic comprises the following steps of: proportioning analytically pure barium carbonate, calcium carbonate, zirconium oxide, titanium oxide and lanthanum oxide in a stoichiometric ratio of Ba<1-x>LaxCa0.075(Zr0.9Ti0.1)<1-x/4>O3, wherein x is not less than 0.01 and not greater than 0.1; and performing the working procedures of dissolving, preparing a sol, preparing a gel, drying, calcining, sintering etc. A large extent of adjustment for Curie temperature range and improvement for dielectric properties can be realized by adjustment for the doping amount of lanthanum oxide and Zr/Ti ratio. The ceramic prepared by the method disclosed by the invention has better voltage endurance, more excellent temperature stability in paraelectric phase, low dielectric loss of about 0.004, high dielectric constant of greater than 3000 and high tuning rate.

Description

technical field [0001] The invention relates to a barium calcium zirconate titanate (BCZT) ceramic doped and modified by lanthanum oxide and a preparation method thereof, belonging to functional ceramics in the field of electronic component manufacturing. Background technique [0002] Many studies have shown that barium titanate ceramics have excellent tunable dielectric properties under the action of an external DC electric field, and this tunable property can be widely used in capacitor devices. However, the research and development of capacitor materials and preparation technologies with high dielectric, low loss, and high tuning ratio has become a development trend and a research hotspot. At present, the materials used in adjustable capacitance devices are mainly researches on the barium strontium titanate ceramic system, but under the action of an external DC electric field, the withstand voltage characteristics of the barium strontium titanate ceramics to adjust the di...

Claims

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Application Information

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IPC IPC(8): C04B35/49C04B35/622
Inventor 郑少英刘来君黄延民方亮徐伟华
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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