Composite Dielectric Ceramic Material for High Temperature Stability
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving high temperature stability and dielectric constant simultaneously, as increasing the content of Ba2LiTa5O15 enhances temperature stability but lowers the dielectric constant, making it difficult to design high-capacity capacitors that meet EIA-X9R specifications.
Innovation Solution
A composite dielectric ceramic material comprising (1-x)BaTiO3-xBa2LiTa5O15 with the addition of binary, ternary, or unary oxide subcomponents such as Li2TiO3, BaSiO3, (Ba0.6Ca0.4)SiO3, SiO2, MnO, CaO, or MgO, which improves anti-reduction ability and maintains dielectric constant stability within the temperature range of −55° C. to 200° C., aligning with EIA-X9R specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the content of Ba2LiTa5O15 is increased to enhance temperature stability, then the temperature coefficient of capacitance curve is stabilized, but the dielectric constant is lowered
Solution Approach 1:
The patent employs a composite material system consisting of BaTiO3 as the base material combined with Ba2LiTa5O15 in controlled amounts (x=0.01 to 0.50 in the formula (1-x)BaTiO3-xBa2LiTa5O15). This composite approach allows the material to benefit from the temperature stability of Ba2LiTa5O15 while maintaining the high dielectric constant characteristics of BaTiO3, thus resolving the contradiction between temperature stability and dielectric constant.
Solution Approach 2:
The patent systematically varies the compositional parameter x in the formula (1-x)BaTiO3-xBa2LiTa5O15 to optimize the balance between temperature stability and dielectric constant. By controlling the content of Ba2LiTa5O15 within specific ranges, the invention achieves the desired temperature coefficient of capacitance stability (meeting EIA-X9R specifications) while preventing excessive reduction of the dielectric constant, thereby resolving the technical contradiction through precise parameter control.
2Quantity of substance
If the dielectric constant is increased to achieve high capacity, then the capacitor capacitance is enhanced, but the temperature stability deteriorates
Solution Approach 1:
The patent uses a composite material system where BaTiO3 (providing high dielectric constant) is combined with Ba2LiTa5O15 (providing temperature stability). The synergistic combination allows the capacitor to achieve high capacitance values while maintaining stable performance across the temperature range of -55°C to 200°C, thus resolving the contradiction between dielectric constant and temperature stability.
Solution Approach 2:
The invention controls the compositional parameter x within specific ranges (0.01 to 0.50) to achieve the optimal balance between dielectric constant and temperature stability. This parameter control ensures that the capacitor meets EIA-X9R specifications for temperature coefficient of capacitance while maintaining sufficiently high dielectric constant for high-capacity applications.
3Reliability
If oxide subcomponents are added to improve anti-reduction ability, then high-temperature stability is enhanced, but the complexity of material composition increases
Solution Approach 1:
The patent introduces oxide subcomponents (such as MnO, MgO, CaO, SiO2, Li2TiO3, BaSiO3, or (Ba0.6Ca0.4)SiO3) at localized, controlled levels (0.1 to 10.0 moles per 100 moles of main component) to specifically enhance anti-reduction ability and high-temperature stability. This localized addition approach improves reliability without significantly increasing overall material composition complexity, as the subcomponents are added in small, precisely controlled amounts.
Solution Approach 2:
The oxide subcomponents act as intermediary elements that facilitate the formation of stable phases and improve the anti-reduction characteristics of the dielectric ceramic material. These subcomponents mediate between the main components (BaTiO3 and Ba2LiTa5O15) to enhance high-temperature stability while maintaining a relatively simple overall composition structure that meets manufacturing requirements.
Data Source
AI summary
A composite dielectric ceramic material having anti-reduction and high temperature stability characteristics includes the main component of (1-x)(BaTiO3)-x(Ba2LiTa5O15) formulated in accordance with the relative molar ratio of up to 100 mole composite dielectric ceramics and a predetermined ratio of one or multiple oxide subcomponents corresponding to 100 moles of the main component. The oxide subcomponents of Li2TiO3, BaSiO3, (Ba0.6Ca0.4)SiO3 and SiO2 can be used as sintering aids to provide a sintering promotion effect. The oxide subcomponents of CaO, MnO, MgO can also be selected used to improve dielectric stability. More particularly, CaO has the advantages of improving the anti-reduction ability and increasing the coefficient of resistance. Therefore, with the adding of the oxide subcomponents and their interactions, the rate of change of the TCC curve of the composite dielectric ceramic material (1-x)(BaTiO3)-x(Ba2LiTa5O15) in the temperature range of −55° C.˜200° C. is significantly inhibited, and its dielectric constant (k-values) is also well improved.