X8R type BCZT-based BME-MLCC dielectric material suitable for high voltage resistance and high reliability and preparation method thereof
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A technology of dielectric materials and quality, applied in the field of materials, can solve problems such as disadvantages, reduce the cost of MLCC, cannot meet the dielectric of ultra-thin layer ceramic capacitors, etc., and achieve the effect of increasing resistivity and reducing production costs.
Active Publication Date: 2022-02-18
TSINGHUA UNIV
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Visible, existing method has adopted barium calcium titanate more than 200nm as matrix, can't satisfy the preparation of ultra-thin layer multilayer ceramic capacitor dielectric; Introduce poisonous element such as vanadium pentoxide in dopant, is unfavorable for environmental protection and human. Non-toxic and harmless; the MLCC dielectric material prepared by air sintering with barium titanate matrix cannot meet the preparation of base metal inner electrode MLCC, which is not conducive to reducing the cost of MLCC
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Embodiment 1
[0054] (Ba prepared in this embodiment 1-x Ca x )(Ti 1-y-z Ca y Zr z )O 3 The molecular formula of the base metal internal electrode multilayer ceramic capacitor dielectric material is as follows:
[0055] 100mol% (Ba 0.95 Ca 0.05 )(Ti 0.96 Ca 0.02 Zr 0.02 )O 3 -2mol%MgO-1mol%MnO 2 -1mol% BaCO 3 -1mol% SiO 2 -1mol%Y 2 o 3 -1mol%Yb 2 o 3 Formula Ⅰ-1
[0056] figure 1 and figure 2 Adopted for this embodiment (Ba 1-x Ca x )(Ti 1-y-z Ca y Zr z )O 3 From the X-ray diffraction images and SEM images of the matrix powder, it can be seen that the BCZT matrix powder has no impurity phase, the grain size distribution is uniform, and the average grain size is about 160nm.
[0057] Prepare as follows:
[0058] According to the stoichiometric ratio of the above chemical formula, using 160nm (Ba 0.95 Ca 0.05 )(Ti 0.96 Ca 0.02 Zr 0.02 )O 3 As the base powder, isopropanol (about 10 times the mass of the powder) was used as the dispersion medium, ball milled f...
Embodiment 2
[0073] (Ba prepared in this embodiment 1-x Ca x )(Ti 1-y-z Ca y Zr z )O 3 The molecular formula of the base metal internal electrode multilayer ceramic capacitor dielectric material is as follows:
[0074] 100mol% (Ba 0.95 Ca 0.05 )(Ti 0.97 Ca 0.02 Zr 0.01 )O 3 -2mol%MgO-1mol%MnO 2 -1mol% BaCO 3 -1mol% SiO 2 -xmol%Ho 2 o 3 -xmol%Dy 2 o 3 Formula Ⅰ-2
[0075] Prepare as follows:
[0076] According to the stoichiometric ratio of the above chemical formula, using 120nm (Ba 0.95 Ca 0.05 )(Ti 0.97 Ca 0.02 Zr 0.01 )O 3 The powder is used as the matrix powder, using deionized water as the dispersion medium, adding a certain amount of dispersing aid, ball milling for 6 hours, and then transferred to a measuring cup for stirring.
[0077] The soluble metal salt Mg(NO 3 ) 2 ·6H 2 O, Mn(CH 3 COOH) 2 4H 2 O, (CH 3 COOH) 2 Ba,Dy(NO 3 ) 3 ·6H 2 O and Ho(NO 3 ) 3 ·6H 2 O is dissolved in a certain amount of deionized water to form a metal salt solution...
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Abstract
The invention discloses an X8R type BCZT-based BME-MLCC dielectric material suitable for high voltage resistance and high reliability and a preparation method thereof. The molecular formula of the BCZT-based dielectric material is shown as a formula I, in the formula I, in (Ba1-xCax) (Ti1-y-zCayZrz) O3, x represents the mole fraction of Ca in the A site, x is larger than or equal to 0.01 and smaller than or equal to 0.05, y represents the mole fraction of Ca in the B site, y is larger than or equal to 0.01 and smaller than or equal to 0.05, z represents the mole fraction of Zr, and z is larger than or equal to 0.01 and smaller than or equal to 0.05. Compared with BaTiO3 which is widely used, the Curie temperature of the BCZT can reach 125-135 DEG C, the room temperature dielectric constant of the dielectric material can reach 1800-2800 through chemical coating modification, the higher use temperature requirement is met, and then the MLCC anti-reduction dielectric material meeting the X8R characteristic is prepared. The research on the BCZT-based X8R type ultrathin layer BME-MLCC dielectric material with high voltage resistance and high reliability has important practical application significance. (Ba1-xCax) (Ti (1-y-z) CayZrz) O3-MgO-MnO2-BaCO3-SiO2-R2O3 is shown as a formula I in the specification.
Description
technical field [0001] The invention relates to an X8R type BCZT-based BME-MLCC dielectric material suitable for high pressure resistance and high reliability and a preparation method thereof, belonging to the field of materials. Background technique [0002] As one of the most commonly used electronic components, capacitors store and release electrical energy in the form of static electricity, and are widely used in various high and low frequency power circuits. Multilayer ceramic capacitors (MLCC) occupy more than 90% of the capacitor market due to their small size, high voltage resistance, high temperature resistance and wide capacity range. In recent years, with the continuous advancement of technology in consumer electronics, 5G base stations, electric vehicles and other civilian fields, as well as military fields such as aerospace, aviation, and ships, the requirements for MLCCs are also constantly increasing. Especially affected by global energy and climate change, t...
Claims
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