Preparation method of low-loss ferrite bismuth-barium titanate-based piezoelectric ceramic
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A technology of bismuth ferrite and barium titanate, applied in the field of preparation of lead-free piezoelectric ceramics, can solve the problems of high dielectric loss, difficult polarization and the like, and achieve the effect of reducing volatilization
Active Publication Date: 2015-03-11
GUILIN UNIV OF ELECTRONIC TECH
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In order to maintain the valence balance, these two factors will lead to the generation of a large number of oxygen vacancies, which will eventually make the sample have high dielectric loss and difficult polarization.
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Embodiment 1
[0019] General composition formula: 0.75(Bi 0.99 La 0.01 )FeO 3 -0.25Ba(Ti 0.98 sn 0.02 )O 3 -0.5%BiMnO 3 + 0.6%LiBiO 3 +0.6%Ba(Cu 1 / 3 Nb 2 / 3 )O 3 +0.5%Ba(W 1 / 2 Cu 1 / 2 )O 3 , the preparation method comprises the following steps:
[0020] (1) To analyze pure Fe 2 o 3 、 Bi 2 o 3 、BaCO 3 、TiO 2 , La 2 o 3 , SnO 2 , MnCO 3、 CuO, WO 3 , Nb 2 o 5 , Li2 CO 3 as raw material, according to 0.75(Bi 0.99 La 0.01 )FeO 3 -0.25Ba(Ti 0.98 sn 0.02 )O 3 -
[0021] 0.5%BiMnO 3 +0.8%LiBiO 3 +0.6%Ba(Cu 1 / 3 Nb 2 / 3 )O 3 +0.5%Ba(W 1 / 2 Cu 1 / 2 )O 3 , for batching, ball milling with absolute ethanol as the medium for 24 hours, drying at 100°C / 12 hours, sieving, putting into a high-alumina crucible with a cover, and then putting it into a closed oxygen-through tube furnace at 250°C / h The heating rate is increased to 800°C, the high pressure oxygen is added to 20MPa, and the temperature is kept for 4 hours to synthesize, and the temperature is lowered to below 200...
Embodiment 2
[0031] Composition: 0.75(Bi 0.99 La 0.01 )FeO 3 -0.25Ba(Ti 0.99 sn 0.01 )O 3 -0.5%BiMnO 3 +0.6%LiBiO 3 +
[0033] The preparation method is the same as in Example 1.
[0034] The performance measurements are as follows:
[0035] d 33 (pC / N) Q m k p ε r tanδ(%) 157 41 0.30 764 0.961
Embodiment 3
[0037] Composition: 0.75(Bi 0.99 La 0.01 )FeO 3 -0.25Ba(Ti 0.99 sn 0.01 )O 3 -0.5%BiMnO 3 + 0.8%LiBiO 3 +
[0038] 0.6%Ba(Cu 1 / 3 Nb 2 / 3 )O 3 +1.0%Ba(W 1 / 2 Cu 1 / 2 )O 3 The preparation method is the same as in Example 1, except that the sintering temperature is 850°C / 4h
[0039] The performance measurements are as follows:
[0040] d 33 (pC / N) Q m k p ε r tanδ(%) 138 37 0.296 730 0.984
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Abstract
The invention discloses a low-loss BiFeO3-BaTiO3-based leadless piezoelectric ceramic and a preparation method thereof. The composition general formula of the low-loss BiFeO3-BaTiO3-based leadless piezoelectric ceramic is (1-x)(Bi1-tLat)FeO3-xBa(Ti1-uSnu)O3+0.5%BiMnO3+yBa(Cu1/3Nb2/3)O3+zLiBiO3+mBa(W1/2Cu1/2)O3, wherein t, x, u, y, z and m express mole fractions; t is larger than 0 and less than or equal to 0.02; x is larger than or equal to 0.15 and less than or equal to 0.30; u is larger than 0 and less than 0.05; y is larger than 0 and less than 0.05; z is larger than 0 and less than 0.05; m is larger than 0 and less than 0.05. The preparation method comprises the processes of preparing materials according to the composition general formula, ball milling, molding pills, discharging glue, sintering and the like. By adopting the technologies of reduction of sintering temperature, rapid heating and cooling and high pressure oxygen, volatilization of Bi element is reduced, oxygen vacancy is restrained, valence change of Fe<3+> is prevented in the cooling process, and therefore, the purpose of reducing dielectric loss is achieved, the high temperature leadless piezoelectric ceramic with the dielectric loss lower than 0.5% is prepared, and the leadless piezoelectric ceramic can be practically applied to the high temperature piezoelectric field.
Description
technical field [0001] The invention relates to a preparation method of lead-free piezoelectric ceramics, in particular to a preparation method of low-loss high-performance bismuth ferrite-barium titanate-based high-temperature lead-free piezoelectric ceramics prepared by low-temperature liquid phase rapid sintering under high-pressure oxygen conditions . Background technique [0002] Piezoelectric ceramics are widely used in high-tech fields such as information, laser, navigation, electronic technology, communication, measurement and detection, precision processing and sensing technology. Bismuth ferrite-barium titanate piezoelectric ceramics have received great attention because of their lead-free, low sintering temperature, high Curie temperature, high depolarization temperature and good piezoelectric properties. In 2009, Serhiy O. Leontsev and Richard E. Eitel et al. reported that the piezoelectric constant of the system can be obtained under the condition of sintering ...
Claims
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